In version 6.7.7 (15.11.18) :


!!! A license synchronization is required before the update of PVsyst !!!



    1. Hidden  parameters: reorganized the topics, more easy

    2. Stand-alone systems, battery, controllers: translation (only in French just now)

    3. Batch mode: added ground albedo as parameter for bifacial systems

    4. Interactive map: added new map using OpenStreetMap services and
            OpenLayers protocol

    5. Shadings : added possibility to apply strings attribution to multiple selected fields


Fixed errors:

  1. Grid-storage with undersized Charger: unrealistic overload loss

  2. Stand-alone controllers: sometimes thresholds def. not well initialized

  3. Pumping: creating new Variant crashed.

  4. Batteries and Pumps databases: some bad definitions.

  5. Several dialog problems due to deep modernization of dialogs in V 6.76:
          Module layout:         Problem for getting I/V curves model
          PV modules definition: Rserie, Rshunt not modifiable
                                 Bifacial option not modifiable
          Detailed losses:       AC losses: definition as % did not work
          AMPT optimizers:       Number of modules in series not modifiable.

  6. Fix for components not appearing in import and export tool.

  7. Fix for crash in the Bifacial tool with 2d unlimited sheds.

  8. Fix for crash when importing a variant to a new project.

  9. Fix for crash when starting a new project without admin rights and UAC disabled.


In version 6.7.6 (18.10.18) :


!!! A license synchronization is required before the update of PVsyst !!!



    1. Battery storage in grid systems:
            3 strategies: self-consumption, peak shaving, weak grid islanding

    2. Simulation: Implementation of FirstSolar spectral correction model, which can be used with all PV technologies

    3. Filter for Bi-facial and 1'500V PV modules

    4. PVGIS import:  the old site will be closed soon,
            implemented new import of hourly TMY or monthly data, directly from their API

    5. NREL NSRDB:  TMY hourly or Monthly data, direct import from their API

    6. Meteo import in SAM CSV format:
            for  NREL NSRDB  hourly / sub-hourly / multi year / TMY  files
            for  Explorador Solar TMY (Chile).

    7. Creation of a site: direct import of hourly data from several API sites

    8. Horizon import: direct from PVGIS, or flexible .CSV format


    1. Ageing tool reworked, now with a table of Yields, PR and PR loss values

    2. Report presentation: restructured, marked different parameter sections,
            gather important infos about the system on the fist page

    3. Report customization: possibility of choosing columns on the main table
            other possible customizations (system type, etc.)

    4. Grid limitation strategy, accounted now as a specific "Unused Energy" loss

    5. Stand-alone systems: secured the definition of SOC thresholds

    6. Geographic site coordinates: defined now as seconds (30m resolution),
            or with 4 decimals (11m resolution) for horizon definition purpose.

    7. Meteo sources no longer available: removed from the Meteo import tool.

    8. Workspace contains now a \template\ directory for all template files (new ones)

    9. Button to open the Windows explorer in \PVsyst660_Data\

    10. License: enhanced reading of HostID information on Virtual Machine

    11. Project: enhanced sorting when loading project


Fixed errors:

  1. Several issues in the Pumping system definition, when creating it from scratch

  2. Warning: the basic mechanism for all dialogs has been deeply modernized,
          this may lead to unexpected errors in some dialogs

  3. Errors in the Module Layout calculation (for severe shading situations only):
          - with Maxim PV modules when the Vlimit is very low
          - with SolarEdge optimizers when using Half-cell modules.

  4. Import: fixed importation of project as component (.vdx variants were missing).


In version 6.7.5 (06.08.18) :


!!! A license synchronization is required before the update of PVsyst !!!


    1. String inverters: add. info, and warning when choosing "Use Multi-MPPT"

    2. Help about bi-facial: add a page explaining the results in detail


Fixed errors:

  1. Projects involving Mixed orientation: errors in simulation
         (namely on IAM and near shading losses)

  2. CSV hourly files: error in the version 6.74: many values were null !

  3. Ageing tool: always reverts to 10 years when entering the dialog.

  4. Solar parameters tool (plots): some insignificant errors.

  5. Maxim optimizers: little error in simulation => Ohmic loss = 0.


In version 6.7.4 (13.07.18) :


!!! A license synchronization is required before the update of PVsyst !!!


    1. Update to Meteonorm V 7.2
         New database of 2'500 stations
         New features: Linke coefficient, Humidity (for spectral corr.)
         Mention of the RMS of the years distribution  (for P50/P90).

    2. Weather-corrected Performance Ratio  (temperature corr. only).



    1. Optimized simulation speed for cases with many inverters or MPPT inputs

    2. Customization of some features of the report
           (show PR weather-corrected, some selectable columns in monthly table)

    3. Bi-facial: improved Help, set a detailed procedure

    4. License: enhanced reading of HostID information


Fixed errors:

  1. SolarGIS monthly files were no more readable (modif. SolarGIS)

  2. Bifacial Mismatch loss: was slightly over evaluated (by the % of Bifacial)

  3. Fixed error of V 6.73 concerning Grid MV Voltage in AC losses.

  4. Batch parameters reading on file was not operational.

  5. SolarEdge new optimizers P850: fixed sizing problems.

  6. Maxim optimizers: Voltage limit not well taken into account (no effect on simulation results).


In version 6.7.3 (29.05.18) :

PVsyst now uses hardware acceleration and requires display drivers which support OpenGL 2.0. Please make sure they are up-to-date.


    1. New language available: Portuguese.

    2. Import of Meteo data measured on a tracker

    3. Economics: new database for defining component's prices.



    1. Revised the dialog for the Meteo import (ASCII) format, improved visualization of the source file contents


Fixed errors:

  1. Helios3d import: in V 6.72, the tables positions were shifted by 1/2 table

  2. Report: Scale error in the Normalized variables plot

  3. Possible little simulation error when  Inverter losses over current limit.


In version 6.7.2 (04.05.18) :

PVsyst now uses hardware acceleration and requires display drivers which support OpenGL 2.0. Please make sure they are up-to-date.


    1. Shadings : masks can be defined for zones of tables, preventing them to place tables in these areas.


Fixed errors:

  1. Tracking diffuse computations : fixed an error in calculations when using multi-threading


In version 6.7.1 (01.05.18) :

PVsyst now uses hardware acceleration and requires display drivers which support OpenGL 2.0. Please make sure they are up-to-date.


    1. Tool for Ageing studies, multi-year batch simulation:
            - For different operating years, same meteo data
            - For a set of yearly meteo data files
            - Results and graphs on the report

    2. Shading calculations: multi-threading



    1. Possibility of backtracking with horizontal trackers, shifted trackers

    2. Meteo ASCII files import: completely revised, more reliable for any file,
            exports the list of the data problems in the file.

    3. Batch mode and sheds optimization tool:
            - Modification of the pitch as parameter
            - Bi-facial: height above ground as parameter.


Fixed errors:

  1. Horizontal tracking: fixes for the non-zero azimuth definition

  2. Stand-alone systems: error in the Threshold's analysis tool
          => specified erroneous voltage thresholds on the report

  3. Transposition factor optimization plot: crash

  4. Error when reading new CdTe (First Solar) PV modules


In version 6.7.0 (29.03.18) :

PVsyst now uses hardware acceleration and requires display drivers which support OpenGL 2.0. Please make sure they are up-to-date.


    1. Bifacial model for tracking 1-axis systems (unlimited trackers).

    2. Report outputs: now managed with in integrated PDF tool
         You can visualize, scroll, save and print like any PDF document

    3. Loss diagram: export of the values (with more details) to EXCEL.



    1. Report: refined the add. information about the sheds and trackers systems
         (sheds size and pitch, GCR, limit angles, etc).

    2. Wiring resistance management: improvement of the choice stability (% Pstc)
         when changing the nominal power.

    3. Wiring resistance help: revision, new page for detailed calculations.

    4. SolarEdge: implemented mix with "normal" inverters in other sub-arrays
         (was not possible un to now, and freezed).

    5. SolarEdge pre-sizing process: correction and improvement.

    6. Workspace: updated and improved selection of directories in workspace dialogs.

    7. Tables of monthly values: improved some units displays, now up to 10 columns.


Fixed errors:

  1. Inverter night losses: now null if the option "night disconnect"
       (after external transformer) is activated

  2. Battery system definition: crash when choosing the battery first

  3. Grid Power limitation: didn't work properly with very big systems,
       the limitation was at the inverter level => did not recover losses
       from inverter to grid when overload (little yield underevaluation).

  4. Bug fixes specific to version 6.6.9 : Erroneous voltage in the lists of batteries


In version 6.6.8 (02.02.18) :

PVsyst now uses hardware acceleration and requires display drivers which support OpenGL 2.0. Please make sure they are up-to-date.


    1. Implementation of Lithium-ion batteries :
         Model, Dialog, Database, Simulation, Help



    1. Report: mention of the Pitch, collector width, GCR when pertinent.

    2. P50-P90: possible to get chosen Pxx values on the report
           Reviewed the initial default values  (erroneous since some versions)

    3. SolarEdge:   New devices, especially for Japan
           Optimizer Efficiency:  updates and improvements
           Big systems: corrected the very long delays in the dialog
           String length (PMax) was sometimes limited incorrectly with respect to rules
           Simulations with old SolarEdge configurations: report and results not available
           PV modules strings in parallel on the optimizer input: didn't work properly.

    4. LID losses also defined with Stand-alone and pumping systems.

    5. Pumping systems dialogs: improved the update of controllers when changing pump.

    6. Workspace: updated and improved selection of directories in workspace dialogs.

    7. License: simplified license management of some rare PC configurations
           that were involving manual operations.


Fixed errors:

  1. IAM customized profile definition with  *.PAN files was not read (repaired)

  2. Import of Meteo data files: some didn't work anymore,
         some providers have changed their format

  3. Several little bugs with Pumping and Stand-alone systems dialogs

  4. Night losses not accounted correctly with multiple inverters

  5. Fixed language of some dialogs that were in French since last Delphi update.


In version 6.6.7 (16.11.17) :

PVsyst now uses hardware acceleration and requires display drivers which support OpenGL 2.0. Please make sure they are up-to-date.


    1. New "orientation" option: unlimited trackers, horizontal axis
         No need for constructing a 3D scene

    2. New variable in the PV module:  "Glass Front Surface" definition.

    3. New default for IAM profile  (applicable to new modules in the DB):
           Normal glass, plastic:   Fresnel's laws profile
           AR glass or Textured :   Fresnel's laws with AR coating.


Fixed errors:

  1. Error or crash when importing components from the EXCEL DB file (V 6.66 only)

  2. Reading of PV modules: customized IAM profile not read  (V 6.66 only)

  3. SolarEdge optimizers with two modules in input:
         error in Efficiency Loss.

In version 6.6.6 (27.10.17) :

PVsyst now uses hardware acceleration and requires display drivers which support OpenGL 2.0. Please make sure they are up-to-date.


Fixed errors:

  1. Near Shadings: fixed copy & paste of objects

In version 6.6.5 (26.10.17) :

PVsyst now uses hardware acceleration and requires display drivers which support OpenGL 2.0. Please make sure they are up-to-date.


    1. Shadings: Tool for the detailed study of thin objects shading according to the object's distance

    2. Shadings: added an advanced selection dialog.

    3. Pumping systems: completely new system dialog many improvements of the pumping systems management.



    1. Bi-facial systems model:
           - add 2 new contributions: beam component on the rear side
           - corrected contribution of the ViewFactor in the Loss diagram.

    2. Controller for Pumping systems: completely reviewed the definition dialog
           (especially concerning SOC thresholds).

    3. Pumps and Pumping controllers database: several new components.

    4. Deeply revised Help of Shadings calculations models, Thin objects,
          Pumping systems, Bi-facial, etc.

    5. PV module dialog, Low-light performance specification:
           improved record and management of specified values.

    6. Shadings 3D: added "by modules" parameter to the grouped modifications.

    7. Report: direct creation of PDF reports without usinf PDFCreator.

    8. Workspace: switching workspace opens the current workspace location,
           not the user's documents folder.


Fixed errors:

  1. Shading 3D: in some cases, different plane orientations are not recognized

  2. Shading 3D Helios3D and complex scene: sometimes higher shading losses due to
         erroneous identification "Behing the plane"

  3. Trackers "tilted or horizontal axis": errors when axis azimuth is not null
         (only significant with very high azimuths like 180°)

  4. Variables specified for CSV hourly files or Monthly tables
         were not well recorded on files  (=> necessitate redefinition at each run)

  5. SolarEdge and other optimizers used with Ageing: simulation crash when the
         Mismatch Rms values for ISC and Voc are null.

  6. SolarEdge optimizers: error when 2 modules strings at the optimizer input
         ( => very high shading or IAM loss)

  7. SolarEdge with Ageing: error in ModuleLayout,
         only significant when very big electrical shading contribution.

  8. Maxim optimizers: don't appear in lists (in the version 6.64 only)

  9. Some very special cases, EOutInverter may slightly overcome PNom (0.03% error)

  10. Analyse of Measured data: error preventing any simulation (V 6.64 only)

  11. Unavailability loss: periods sometimes specified for another year than
         the meteo data  (=> no loss) !

In version 6.6.4 (05.09.17) :

PVsyst now uses hardware acceleration and requires display drivers which support OpenGL 2.0. Please make sure they are up-to-date.


    1. Mismatch between strings: Tool for a deep study of the phenomenon
          Quantified mismatch loss for centralized and string inverter configurations
          Tool for the evaluation for string length differences and mismatch effects

    2. Orientation definition in complex systems: new tool
          Helios3D and terrain installations: possibility of defining several average orientations.
          Grouped Orientation for distributed systems like round buildings.

    3. SolarEdge architecture: complete revision
         Definition of "physical" inverters with different strings as inputs
         Complete treatment of Optimizers efficiency and electrical losses (ModuleLayout).

    4. Meteo data import: direct access to 2 new data sources:
           Reuniwatt (worldwide) and Explorador (Chile)



    1. Bifacial 2D model: improved model for operating limit conditions (large heights),
      Improved the parameter import from the "real" system defined in 3D
      Conceptual error in the model, which lead to an underestimation of the rear side irradiance by a factor of 1/GCR (i.e. a factor of 2 or more!)
      Add the contribution of the Diffuse seen from the rear side.
      Albedo in monthly values.Seasonal orientation: possibility of negative summer tilt for low Latitudes.

    2. Inverter input: explicit management of the Maximum current per MPPT
      New loss "Over Max. current" replaces some losses which were previously registered as  "inverter loss below voltage threshold".

    3. PNom sharing: new management (groups of sub-arrays), checks, warnings, etc.
      Update of the help, especially concerning the option "Use Multi-MPPT"

    4. Deep review of the Pumps and Pumping controllers databases management
      Added numerous high power pumps and power controllers.

    5. Reviewed files for DEMO Stand-alone and Pumping systems.

    6. Improved speed for opening projects with a big number of fields in the shadings.

    7. Improved performance of triangulation algorithm when importing big CSV ground data

    8. Licensing system: improved robustness and added specific support of rare PC configurations that were not supported.


Fixed errors:

  1. Reading User's needs (load) files of hourly data:
    Securized reading of Units at top of the column (Message when not recognized)
    Suppressed reading of 29th February

  2. Some sizing problems when using AMPT string optimizers

  3. Azimuth calculation acc. to table baseslope: error in some special cases 
    (i.e. only when creating the Table object with Azimuth <> 0)

  4. Tracking with Frames NS: Tilt angles < 0 (sun beyond E/W) were not working

  5. Global scene rotation issue giving angles beyond boundaries

  6. Crashes with tracking systems and partial shadings

  7. Ground image not always saved properly

  8. Zones of tables sometimes not filled correctly

  9. Batch simulation sometimes produces bad output files

  10. Error when reading components with a dot in the Filename

  11. Error when using list of geographical sites

  12. Report: Sometimes settings of printer head lines (in Preferences) didn't work

  13. Report: Horizontal overlap when the Windows Font Size is increased

  14. Report: Error when scrolling zoomed with more than nine pages

  15. Display of last usable version of PVsyst was incorrect in some cases

In version 6.6.3 (23.06.17) :

PVsyst now uses hardware acceleration and requires display drivers which support OpenGL 2.0. Please make sure they are up-to-date.


    1. Definition of a system kind in the project's dialog.

    2. Seasonal orientation: possibility of negative summer tilt for low Latitudes.

    3. Inverter definition, efficiency curve, dialog and plots improvement.

    4. Direct import of new Meteo data sources (Ashrae IWEC, etc).

    5. Database update.


Fixed errors:

  1. Electrical shadings: not computed in Stand-alone systems,

  2. Electrical shadings: not well accumulated in Mixed orientation systems,

  3. Stand alone systems: the Genset was not read on the file,

  4. muPmpp could be defined as positive value, without error message,

  5. Backtracking error message when trackers with different pitches,

  6. Tracking axis azimuth not well reported in the report.

In version 6.6.2 (01.05.17) :

PVsyst now uses hardware acceleration and requires display drivers which support OpenGL 2.0. Please make sure they are up-to-date


    1. Feature for placing any object above the ground object.

    2. Bifacial systems management: parameter definition from the system not well taken into account.

    3. Tracking systems without 3D shadings definition: was possible, now a warning.

    4. Warning/Error message when the wiring resistance is not correct.


Fixed errors:

  1. Warning/Error message when the wiring resistance is not correct,

  2. Tracking systems: still shading diffuse calculation errors in some cases,

  3. Helios3D import: the not-PV objects were not imported correctly,

  4. Module layout with trackers:  filling of the trackers by modules,

  5. Domes: partition in module strings not shown on the second face (display only),

  6. Pumping systems: specified tank volume modified by the pre-sizing tool,

  7. Maxim optimizer: some Maxim modules without diode number definition in the database => erroneous values,

  8. Report copy in Clipboard: parameter's page sometimes blank,

  9. Module layout: some error and warning messages not always pertinent,

  10. Use of the model library file for variables to be registred (SFI).

In version 6.6.1 (24.03.17) :


    1. When importing shading scenes from DAE or 3DS files,
         it is now possible to select one or more materials
         in order to transform objects to PV fields directly.


Fixed errors:

  1. Read of Load hourly profiles from a file,

  2. Shading calculations with some tracking systems: Linear shading null,

  3. Shading calculations with some tracking systems: Message preventing simulation,

  4. Loss parameters (Thermal, Soiling) or others (Inactive bands) not correctly registred on the file,

  5. Pumping systems, definition of Water use crashes with new Variants,

  6. Inverters: DC-DC input didn't work anymore,

  7. IAM profiles: little differences (0.14%) between different runs,

  8. SolarEdge converters with Fractional inputs: simulation big error,

  9. AMPT strings optimizers: erroneour Message prevents the simulation,

  10. Shadings :
          - Object selection using the mouse has been fixed
          - Improved memory consumption for big scenes
          - Fixed 3DS not loading when textures missed.

In version 6.6.0 (09.03.17) :


      1. The 3D drawing system has been completely revisited:
           - using now the popular 3D platform  OpenGL
           - with a completely new drawing window and renewed tools organization
             more compatible with and similar to usual 3D tools
           - fluid navigation, high quality visual effects,
           - improved management of zones, selection options,
           - population of numerous tables in multiform zones,
           - Updated Help for all these new features
           - Some tutorial videos for these new features

      2. Import of  *.dae  3D drawings   (Sketchup, AutoCAD, others)

      3. Project's general dialog: completely revised, more ergonomic. Improved management of Variants

      4. Bi-facial systems: complete model for shed-like PV systems pedagogical tools for a deep understanding of the issues. Other configurations (vertical, tracking, acc. to 3D scene) in preparation.

      5. Multi-orientation systems (especially for dome configurations):
           possibility of sharing the maximum inverter power along the day either to 2 different MPPT inputs, or to each inverters in mixed orientation.

      6. IAM: easy use of predefined profiles  (Fresnel normal or with AR, Sandia) Renewed the dialog in the  "Detailed losses".

      7. Measured data comparisons: import of the parameters of a simulation variant.


    1. Import of Meteo files from new providers (NSRDB, SolarAnywhere, 3-Tiers, etc),
         Updated the help.

    2. Import of multi-year meteo data files from several providers.

    3. Long-term degradation batches: the 'year of simulation' can be used as batch parameter.

Fixed errors:

  1. This version has been submitted to many Beta-testers. We tried of course to eliminate all reported bugs.

  2. Several (rare) bugs reported by users fixed.

In version 6.53 (03.02.2017) :


      1. Import a variant (simulation parameters) into a data comparison variant

      2. Pumps database: added high power pumps (up to 180 kW) and new Grundfos


    1. Import of PVsyst_Std meteo files on POA: possibility of using Perez model,

    2. Improvement of some warning/error messages

Fixed errors:

  1. Trina PV modules with Maxim optimizer: error in the database,
         => the results are completely erroneous.

  2. Several (rare) bugs reported by users fixed.

In version 6.52 (12.12.2016) :


    1. Database update

In version 6.51 (28.11.2016) :


    1. "Maxim Integrated" optimizers at the sub-module level



    1. Pumping systems, many improvements,

    2. Possibility of defining pumps on an EXCEL document,
           => easier for enriching the database with numerous models.

    3. New faster algorithm for Module Layout calculations.


Fixed errors:

  1. Pumping systems, Controller for pumping: several crashes solved.

  2. Inverters: crashes for some models with unbalanced MPPT inputs and one only efficiency profile. (V 6.49 only)

  3. Several errors in some specific cases when importing Meteo data from SolarAnywhere, Solar Prospector, PVgis when using Chrome.

  4. Use of Perez model: sometimes mentions Hay on the report.

In version 6.49 (30.09.2016) :

Fixed errors:

  1. ModuleLayout: Error when choosing "Portrait": shown module sizes incorrect

  2. ModuleLayout: Modules not displayed correctly in southern hemisphere

  3. Batch mode: crash with ModuleLayout

  4. Errors in 3D objects manipulation (double-click on Gizmo)

  5. Read PV modules: IAM customized profile not read in the database

  6. Stand-alone systems: Controller voltage thresholds incorrect when several batteries in parallel

  7. In some special cases (modif. parameters after simulation): on the report, simulation may be not coherent with the input parameters

  8. SolarGIS files reading: crash when the Timezone is not an integer (India)

  9. P50-P90 dialog: value out of limits at dialog opening

In version 6.48 (13.09.2016) :



    1. Faster loading of Projects and Variants

    2. More output for optimization tool

    3. TIGO optimizers: new device, new behavior for "Smart modules"

    4. Power factor definition: improved the dialog


Fixed errors:

  1. Module Layout dialog corrections

  2. Shadings and project: sometimes unappropriate warnings

  3. Inverter overload loss: error in calculation for sub-arrays with mixed orientation

  4. SolarGIS (v2.1.5): format change when reading multi-annual hourly files

  5. Importimg meteo ASCII files gave error in some cases

In version 6.47 (15.07.2016) :



    1. Copy/paste of multi-selected objects: after Paste, the multi-selection persists

    2. Tranfo loss parameters: increased number of decimals on file


Fixed errors:

  1. Multi-orientation: simulation changes the orientations (only in V 6.46).

  2. Shadings acc. to module strings and multi-orientation: sometimes errors in the shading calculations.

  3. Maxim and Solibro modules: crash  (Maxim modules are still in development).

  4. Wind turbine: retrieved default parameters when edited.

  5. Import ASCII meteo data from POA: sometimes involves the Perez model. Now the Perez model is authorized !

In version 6.46 (27.06.2016) :


This version doesn't provide much novelties.
We are in a phase of stabilization and internal modernization of the software, after the deep changes in the version 6.40 and followings.
Every PVsyst user is encouraged to communicate any problems encountered when using the program.
Important novelties are in preparation, but not yet published.



    1. Backtracking parameters info in the "Orientation" part

    2. Database update


Fixed errors:

  1. Blocking error when developing a tracking system in the version 6.45.

  2. Backtracking: error in diffuse shading factor calculation (only in V 6.45).

In version 6.44 (31.05.2016) :


This version doesn't provide much novelties.
We are in a phase of stabilization and internal modernization of the software, after the deep changes in the version 6.40 and followings.
Every PVsyst user is encouraged to communicate any problems encountered when using the program.
Important novelties are in preparation, but not yet published.



    1. Import of Meteo ASCII files: now possible with files in UT (universal time)


    1. Meteo quality check, better understanding and management of Time shifts

    2. Inverter dialog: display option of the efficiency curve

    3. Deep revision of the user's Warnings and Error management  (internal update)

    4. Load profile in hourly values: improvement of the file management/tolerance

    5. Module layout with sheds: bottom cell considered shaded when at least half the cell is shaded (=> diminishes shading loss)

Fixed errors:

  1. Crash when openening the "Degradation" tool.

  2. Seasonal tilt: correct update of the Summer tilt after simulation.

  3. Seasonal tilt: simulation error in winter in some particular situations.

  4. Import of Meteo ASCII files: Beginnig year, DST management, stabilizations.

  5. Inverter overload: VmppMin (current limit) not taken into account if overpower conditions.

  6. Shading loss: sometimes false simulation when using old files as inputs, but correct as soon as we change something (e.g. recompute table).

  7. Partial shading calculations: error in the Shading factor calculation.

  8. Partial shading calculations: error was not reported when the partial system is not defined => crash in the simulation.

  9. ModuleLayout: now error message when used with Partial shading calculations.

  10. Electrical wiring resistance calculation: nb. of inverters when multi-MPPT.

  11. Stand-alone controllers: revision of modifiable and system-fixed parameters.

  12. Pumping systems: updates and improvements in the hydraulic system dialog.

In version 6.43 (18.03.2016) :


    1. Pumping systems: definition of a customized pipe


    1. Check meteo data: Improved time shift info and management

    2. Shading verifications: suppressed redundant calculations (improves delays in the dialog with big scenes)

    3. SolarGIS files: still some old files not well read (time zone error).

Fixed errors:

  1. Creating PAN files in old format: error when IAM profile is defined

  2. Slight difference in IAM profile interpretation when reading internal DB or PAN file. May lead to slightly different IAM losses.

  3. Little modelling error with PV module use under very low temperatures (<0°C)

  4. Crashes when using the "Degradation" tool.

  5. Site dialog: manual definition of Monthly values didn't work well.

  6. Very old (and rare) crash when suppressing a sub-array.

  7. Several crashes fixed in the 3D Shading scene management and Print previews.

In version 6.42 (19.02.2016) :


    1. Tool for module degradation, including dispersion => increasing mismatch. Simulation for any specified year after commissioning


    1. Read of Load profile files: improved format acceptability

    2. Import Standard meteo files: improved Timeshift and Timezone management

    3. License management: improved useability in some problematic cases

Fixed errors:

  1. Stand-alone systems: error when using some "commercial" Controllers with Voltage control instead of SOC control

  2. Error on Diffuse calculation with horizon + near shadings

  3. Error on electrical shading loss calculation with thin objects

  4. Multi-rectangular fields and other marginal cases: File read errors

In version 6.41 (01.02.2016) :


*** Due to a long delay after the update 6.39, we have extended the update support up to the 6th of February 2016 for users whose supports should stop after the 31st of July 2015. To benefit from this extension, you have to synchronize your license. ****


    1. The transposition model choice (Hay/Perez) is now in the project's definitions

    2. SolarAnywhere data: the temperature is now read when available

Fixed errors:

    1. Some problems with new License management

    2. Sometimes error in the calculation of the IAM loss

    3. Errors when reading some particular calculation versions (with too much variables specified for the ASCII file)

    4. Reading error when defining zones in the 3D shadings.

In version 6.40 (18.01.2016) :


*** This should be considered as a major version ****


    1. Battery system management has been deeply reviewed and partially rewritten.
      The system dialog is now much more comprehensive
      Battery charging Control may be specified in terms of SOC (not battery voltage)
      Visual tool for the relationship between SOC and Voltage thresholds as function of the battery temperature, charging/discharging currents, etc.
      The Presizing tool has been improved (works on several years)
      New tool for an overview of the sizing issues (parametric diagrams)
      Battery simulation treats all kinds of losses as defined for the Grid systems.
      User's needs management deeply modernized.(namely domestic uses with time of use for each appliance)

    2. 3D Shading tool management:
      New algorithm for the shading factor calculation.
       => Calculation time drastically reduced (by factor of 20)
      Import a ground image (google, architect plan, etc) as "background template" for the development of the scene.
      Drawing of objects with the mouse, directly in the scene (useful namely with ground image)
      Smart tool for the displacement of objects
      New objects: domes (opposite sheds), Wind turbines, etc
      The shading effect may be desabled for chosen objects.
      Inversely, the ground objects may be specified as throwing shades
      The Shading factor calculation for a partial sub-system has been improved.

    3. System (sheds) optimization tool:
      Reworked the dialog, with a viewer integrated into a single window,
      Generic parameter selection
      Sketches to visualize selection range and the calculation progression
      Scans of Tilt and Azimuth are now possible for all types of orientations (except tracking).
      The Help has been developed.

    4. All the data files written as Text files.
      This implies a new Workspace kind named  \PVsyst640_Data\.
      Older versions of PVsyst cannot access this new workspace.


    1. Meteo data import: the dialog has been reviewed, new faciliting features
      Improvement of the Help, enrichment concerning all data sources.
      Direct Import for new Meteo data providers:
      - NREL for the Indian territory (satellite data in 10x10 km),
      - Vortex (private  company, for pay).

    2. The dialog for the management of projects has been modernized
      The project may/should be explicitely saved after each modification
      Number of Calculation variants now illimited  (VCi, VDi, etc).

    3. License validation: modified for keeping the license when updating to Win10.

    4. PVsyst can be started from a script.

Fixed errors:

  1. Numerous errors fixed thanks to the Error reporting tool which allows to send
    deteiled reports of your errors to our support team.

  2. Use with Windows XP difficult due to lack of Microsoft maintenance:
    Namely Meteonorm 7.1 requires .NET 4.5, not suported by Win XP.
     => Syntheric generation (normally managed by Meteonorm) has to switch
    to the old generation

In version 6.39 (22.07.2015) :



    1. Complete tool for the optimization of shed (rows) systems. Based on series of simulations in batch mode, with optimizing graphs

    2. Helios3D: possibility of importing shading objects.

    3. Ground objects: may be defined explicitely by a custom file (CSV).



    1. Grid injection limitation: may ba applied to E_Grid at the injection point (formerly the limitation was applied at the inverter level).

    2. In the database lists: custom components identified with grey background.

    3. Import from PHOTON database: automatic correction of the Pnom-Vmp*Imp balance, and correction of the default Rs for getting Rel effic = -3% @ 200 W/m2.

    4. On the report: mention the origin of the data for the PV module ("original database" or "custom defined").

    5. Orientation definition drawing: red point now at a more "logical" position.

    6. Meteonorm 7 management: warns when the .NET V 4.5 framework is not available (previously produced a crash).


Fixed errors:

  1. Errors in the Google maps tool in some very special cases

  2. Tracking planes with not-zero axis orientation: error on shading factor (normally low, increases with Azimuth deviation).

  3. Calculation of mixed-orientation fields: sometimes balance errors in the loss-diagram (but the simulation result is correct).

  4. Domestic uses: seasons not updated for southern latitudes.

  5. Load definition: some dialog errors or inconsistencies.

  6. 3D Shading tool, namely Zone definitions: still some improvements and bugs fixed.


In version 6.38 (13.05.2015) :



    1. SolarGIS import of old versions 1.7 (incl. multi-year).

    2. Sizing tool: PNom ratio also showed for inverter's Pmax = f(temperature).


Fixed errors:

  1. Error in report printing  (some pages partially printed)

  2. Batch: Nb of inverter inputs didn't work with multi-MPPT inverters

  3. Module Layout electrical I/V drawing tool: errors with tracking systems (but the simulation is correct)


In version 6.37 (01.05.2015) :


Fixed errors:

  1. Error in near shadings positioning


In version 6.36 (30.04.2015) :



    1. Shading calculations on a specified partial system => Allows the evaluation of very big systems with reasonable computing time.

    2. 3D editor: Management of object's groups, lists of grouped objects, common modifications on groups of objects.

    3. Import of SolarGIS multi-year files, and written in UT (universal time).

    4. Tool for comparing meteo data (different years, or different sources) Graphs and probability profile for P90 evaluation, average and RMS.

    5. Create meteo files with clear sky model for system oper. analysis and sizing.



    1. Improved Perspective view, define observer's position, focus on some selected object.

    2. New help for Sub-array and Multi-MPPT management.

    3. Import of Meteo Files in Standard format: management of missing data (-99)


Fixed errors:

  1. Meteonorm V 7.1: Diffuse and Temperature not quite well renormalized

  2. When defining Backtracking, the 3D construction is now mandatory

  3. Batch simulation: the AC wiring loss was not operational

  4. Report for Tracking systems: parasitic label about orientation

  5. SolarEdge inverters: possibility of fractional inputs still did'nt work

  6. First use of the program: the workspace was not automatically created

  7. PDF creation during batchs: crashes


In Version 6.35 (24.03.2015) :



    1. Meteonorm 7.1 included   (replaces Meteonorm 6.1)

    2. AC modules: identification in the database, and automatic choice of the partner.



    1. Tool for the study and understanding of electrical shading effects:
           completely rewritten, with side-window plot

    2. Possibility of recording OND files in the old format compatible with V < 6.27

    3. Management of the workspace, INI file and license in some special environments


Fixed errors:

  1. Mixed-orientation arrays: Error in the simulation in V 6.33 ans 6.34

  2. Mixed-orientation arrays: Sometimes errors in the display of number of strings

  3. MPPT Adjust button now available for MPPT power sharing

  4. Changing Availability sometimes changed the manufacturer


In Version 6.34 (06.02.2015) :


Fixed errors:

  1. SolarEdge inverters: possibility of fractional inputs did'nt work anymore

  2. System definition dialog: uncorrect display of some indicative values

In Version 6.33 (29.01.2015) :


    1. Shadings 3D:
                      - definition/manual modifications of a terrain,
                      - definition of zones for positioning "tables" (rectangular or polygonal)
                      - distribution and common modifications of a set of tables in the zone .  

    2. Multi-MPPT inverters: adjustable Pnom sharing between MPPT inputs.  


    1. Overload losses calculation at sizing time (also for Pnom(Temperature)). => PNom ratio quick calculation depending on Pnom(Temp) and CosPhi

    2. Module layout shading calculations:
                      - calculation accuracy for sheds: true calculation of the Linear part.
                      - takes 2nd maximum if under VmppMin.  

    3. Added several special graphs (sorted values, array temp. distribution, etc)

    4. Shading on diffuse for tracking systems: positive azimuths => full calculation (previously supposed symmetrical => errors with significant horizon)

    5. Help for Inverters: reviewed for new features (Pnom=f(temp), power factor, etc)

Fixed errors:

  1. IAM definition in the Module (import from EXCEL crashed + profile not shown)

  2. Electrical behavior of PV arrays tool (shadings): I/V curves display problems

  3. Concentrating systems: error on the loss diagram (but not in calculation)

  4. Pumping: initialization of pressurization systems

In Version 6.32 (14.11.2014) :


    1. Auxiliaries losses: improvements and auto activation when specified in Inverter.  

    2. Report: issues with Power factor, harmonized units as kVA instead of kWh, shows Eapparent as main result, etc....  

    3. Helios3D: improved calculation speed, tolerance to erroneous inputs of h2d files.  

Fixed errors:

  1. 2-axis and versical axis Tracking systems in southern hemisphere: error in the Diffuse shading factor.  

  2. Helioclim data import: also accepts values expressed in TU.  

  3. ModuleLayout, display of electrical effect: crashed.  

  4. Electrical shading loss: thresholds on Linear contribution (V 6.26) also suppressed the contribution of thin objects.  

  5. Pumping systems: unit error in the definition of the daily load.

  6. Bug limiting the rights for update for some few users.  

  7. Bug when reading SolarGIS monthly data (from V 6.31).  

  8. IAM loss management: transfer problems with Multi-arrays.

  9. Module Layout dialog: several problems solved.  

In Version 6.31 (31.10.2014) :

 Not available!

In Version 6.30 (30.09.2014) :


    1. Tigo DC converters: some updates.  

Fixed errors:

  1. Error in the calculation with CdTe modules (in versions 6.27 to 6.29).  

  2. Inverters: page for temperature behavior of Pnom now available.  

In Version 6.29 (24.09.2014) :

Fixed errors:

  1. Fixed bug in 3D shading tool.  

In Version 6.28 (22.09.2014) :

Fixed errors:

  1. Fixed bug in electrical loss.  

In Version 6.27 (19.09.2014) :


    1. Carbon balance (CO2): evaluation tool and new page on the report.  

    2. Management of Tigo optimizers, including definition, operating and shadings

    3. Inverters: temperature dependency of the nominal power (Pmax use, and high temperatures derate), specification of the Power Facor capability


    1. Auxiliary losses now explicitely specified.

    2. Component dialogs, 1st page: info availability an original database/custom.

    3. Big systems shading studies:

        * Improved calculation time of some verifications

        * Possibility of desabling the mutual interpenetration of fields (Helios3D)

        * Execution of some tests upon command instead of automatic

        * Helios3D: improved orientation analysis and tests.

        * Many objects: choice of selected object improved

    4. AC Losses after the inverter: take the Power Factor into account

    5. Improved the model of Shading Electrical loss: was enabled as soon as linear shading was present; now with a threshold (partial cell sheding).

    6. Batch simulations: still some updates.

Fixed errors:

  1. Synthetic generation: sometimes wind data (according to Meteonorm) were added.

  2. Master/Slave operation: error when the Vmppmin was reached.

  3. Littles errors (fonts) fixed in the report.

In Version 6.26 (31.07.2014) :


    1. PV module Rserie default value: according to 200 W/m2 relative efficiency (-3%).  

    2. * Effect: only concerns modules for which the Rserie has not been specified. Low-light behaviour very close to modules with Manuf. specified Rserie

    3. PV module temperature behaviour

    4. * Up to now: the specified muPmpp value was the derivative at 25°C.

    5. * muPmpp calculated at 25 and 45°C: improves matching with the linear behaviour reported by measurements at oper. temperatures.

    6. * Effect: slightly decreases the temperature loss.


    1. Batch mode, significantly improved:

    2. * easier file management (re-use of old files), several new parameters;

    3. * Possibility of specifying a list of VCi (i.e. resimulate a whole project).

    4. Resistivity default values revised  (effect: slight decrease of Wiring loss).

Fixed errors:

  1. Helios3D management: error in verifications of orientations (spread) fixed. This sometimes prevented using old Helios3D scenes.

  2. Hay model: when the sun is behind the plane, the beam component doesn't contribute to albedo (negligible effect with usual systems).

  3. Big shading systems: optimized a time-consuming verification.

In Version 6.25 (16.06.2014) :


    1. Main improvement about ModuleLayout management: 

    2. All tables shown on a single plane - possibility of moving them

    3. Working table directly selectable on the 3D view 

    4. Possible saving as an image  (BMP, JPG, or PNG: transparent) 

    5. Print of the whole ModuleLayout definition

    6. Several Improvements/Optimizations inthe dialog and elaboration 

    7. Export of results in the Report preview: Loss diagram also exportable


    1. Rewrote the batch mode, improvements

    2. Big shading scenes: general dialog speed optimizations

Fixed errors:

  1. Optimization of shading factor calculation was not activeted by default

In Version 6.24 (21.05.2014) :


    1. Report preview: new possibility of modifying units and language.

    2. Report preview: possibility of "Copying" the chosen results in the clipboard for analysis and versions comparisons in EXCEL.

Fixed errors:

  1. Error in Batch mode, when redefining the number of inverters.

  2. Printer choice: always takes the Default printer: fixed.

  3. Many bugs fixes after implementing the tool for reporting runtime errors.

In Version 6.23 (01.05.2014) :

Fixed errors:

  1. Mixed-orientation systems: sometimes error in the simulation => Inverter loss may be underevaluated by around -0.3%..

  2. Tracking 1-axis with not south-axis: some incoherences and modif. impossibilities in the definition dialog (not affecting simulation results).

  3. Prevent opening the software twice simultaneously, which may produce some conflicts.

  4. Grid Input/Output plots: showed variable E_Avail instead of E_Grid.

  5. Several minor dialog and display errors or improvements.

  6. Database update.

In Version 6.22 (24.03.2014) :


    1. Meteo conversion: import of year in the DD|MM|hh|mm format.

Fixed errors:

  1. SolarEdge: do not check number of strings or modules.

  2. 3D tool: fix window which could freeze.

  3. Added a new reporting tool in case PVsyst is crashing.

In Version 6.21 (13.03.2014) :

Fixed errors:

  1. Error when displaying some 3D scenes - 3D scene not written on the report.

  2. Backtracking definition management: sometimes choice not accepted.

In Version 6.20 (10.03.2014) :


    1. Import ASCII meteo files: complete revision of the DST management, included then DST dates for the USA. Also valid for years not beginning in January, and southern hemisphere.


    1. Default component choice: available now.

Fixed errors:

  1. Report: some little problems solved (fonts on second page of parameters).

  2. Module Layout electrical calculations: simulation error in some special cases => alterate the Inverter losses.

  3. Improved speed when clicking on "Create variant from..." in the main project dialog.

  4. Improved logo quality on printed report.

In Version 6.19 (11.02.2014) :

  1. Display of the Modules and they electrical attribution by colors (by Module Layout) directly in the Perspective view.

  2. Save this perspective view as a BMP, JPG, PNG or SVG image for use in other drawing softwares.

  3. Report improvement: avoid long component name's overwriting, Long calculation version titles on 2 lines.

  4. Import ASCII meteo and data files: error messages and dialog improvements, reads dates without specified years; DataMeas: reads multi-fields.

  5. Error in simulation of shading with thin objects: shading loss overevaluated.

  6. Error in electrical shading losses: loss correction on voltage instead of current => only effect: loss if the voltage becomes below the Inverter VmppMin .

  7. Unlimited sheds: parameter not well read on file => azimut aberrant value.

  8. Errors in mixed orientations: little effects on shadings with horizon.

  9. Irradiance and Temperature loss not well displayed (but correct calculation).

In Version 6.18 (31.01.2014) :

  1. Definition of 3D fields: now possible directly by specifying the number of modules in width and in length. Polygonal 3D field: by positioning each module individually with mouse.

  2. Module Layout tool: you can now have a side-view of the 3D perspective with visualization of the edited table in red and choosing the table to be edited in the 3D drawing.

  3. Tables of Hourly values for each month, for any variable of the simulation.

  4. Update of the program: performs a back-up of all user's files, allowing to retrieve the simulations with old versions.

  5. Off-line deactivation of the license: bug fixed.

  6. Update of the ModuleLayout for fields added in the 3D part: bug fixed.

  7. Import of ASCII meteo files: warnings improved and bugs fixed.

  8. Import of ASCII files of measured data: multi-fields now working.

  9. Grid power limitation: bug fixed when defining several sub-arrays.

In Version 6.17 (10.01.2014) :

  1. Error since V 6.14: Electric loss (Module Layout option) not  calculated.

  2. Shading factor table according to strings not written on file (recomputed).

  3. Report: first page not complete for Stand-alone systems.

  4. Meteo monthly tables: line of yearly values erroneous.

In Version 6.16 (03.01.2014) :

  1. Report: Parameters may be printed on more than 2 pages.

  2. Report: Visualization of a saved 3D scene improved. Check of this visualization in the 3D editor.

  3. Sometimes erronous value in the Array wiring resistance, fixed. Some logs for tracking this errors in V 6.14 crashed the program.

In Version 6.15 (20.12.2013) :

  1. Erroneous values displayed in the "Results" dialog.

  2. Some improvemebnts in the Multi-orientation warnings and the report.

  3. Helios3D  now working with Multi-orientation.

  4. PV module definition from Low-light data: crashed.

  5. Summary dialog: copy to clipboard.

  6. Value of the Wiring resistance is sometimes modified to aberrant values. We didn't yet identify the origin of this random (and rare) problem, but we protected the simulation by asking the user for correcting the parameter..

  7. Fixed failure when reading license after the update on some environements.

In Version 6.14 (16.12.2013) :

  1. Problems fixed with shadings - crashed in the "Shadings" dialog.

  2. Problems fixed concerning sheds with not null Baseslope.

  3. Infinite loop in some calculations (Shadings "According to strings").

  4. Shadings "According to strings" not well computed when linear shadings < 0.5%.

  5. Regulator (controller) dialog improved when modifying the nominal power.

In Version 6.13 (09.12.2013) :

  1. Main implementation: Multi-orientation.

  2. Possibility of defining up to 8 different orientations.

  3. Independent shading calculation for each orientation.

  4. Heterogeneous fields: replaced by this Multi-orientation option.

  5. Removed restrictions on the orientation differences and nb of sub-arrays.

  6. Seasonal tilt: now possible with 3D shading calculations.

  7. Electrical Sub-array: now with Name and eventual Orientation definition.

  8. "System summary" new window, available from different places for a general overview of the params defined for the calculation version.

  9. Gives a list of: Orientations, sub-arrays, shading 3D fields defined.

  10. Identifies the uncompatibilities between these 3 entities (orientation and areas matching), provides cibled warnings when necessary.

  11. Deep revision on the verification on system's compatibilities.

  12. Shading and IAM factor on Albedo: improved the calculations (integral model).

  13. Focusing CPV systems: errors in the loss diagram view (not in the results).

  14. Unavailability loss: not stored correctly with the calculation version.

  15. SolarGIS import and Meteonorm synthetic generation: sometimes crashed.

  16. Simulation ASCII files: crashed when more than 30 parameters defined.

  17. Batch simulations: inverter changes not taken into account.

  18. New tutorial about "My first Project", "Meteo Management", "Linear shadings".

  19. Meteo import: fixed Internet Explorer error displayed in importation tool.

  20. Meteonorm: fixed crash when generating data based on Solargis data.

  21. Dialog fonts: added an application setting to change font dynamically for all dialogs.

  22. MSI installation file: fixed signature issue in Internet Explorer 9/10.

  23. Simulation: improved simulation speed (20%).

  24. Project: fixed error when reading list of projects in File >> Export projects.

  25. License: added dialogs to warn and show deactivation link for off-line license transfer.

  26. License: fixed error when reading license when there are more than one hard disk.

In Version 6.12 (24.09.2013) :

  1. SOLARGIS files: complete tool for direct import of all their products: Specific year, TMY, monthly averages or pluri-annual files

  2. PVGIS import: the negative Longitude sign is not read correctly

  3. PV modules import:  PHOTON site has changed, updated accordingly

  4. Simple tool for direct Import/Export of single projects

  5. Light Soaking, LID or IAM defined in the module specifications: directly taken into account in the detailed losses

  6. Module Layout: fields not refreshed when modifying the 3D shading scene

  7. Wind velocity monthly specifications overwritten by Meteonorm

  8. Simulation with shadings: sometimes crashes at beginning (error#9)

  9. Sometimes errors in shading factor when several sub-arrays

  10. Import ASCII meteo files: year 2000 not recognized as leap year

  11. Definition of project's site: sometimes erases Meteo file (with POA data)

  12. Logo display on report bug (size): fixed

In Version 6.11 (26.08.2013) :

  1. Tool for P50-P90 evaluation => new page on the report

  2. Possibility of defining a Power Factor for the grid requirement.

  3. Possibility of defining a Grid Power limitation (incl. with Power factor).

  4. Checked all tracking options for southern hemisphere.

  5. Shading factor optimizations: fixed for very long objects or planes. Improved for Building Objects.

  6. Error#9 when defining Tracking without defining 3D scene: fixed.

  7. Error with 3D Polygonal fields: fixed

  8. Writing unavailability parameters on file

  9. Error when defining load profile by an hourly file: fixed. Improved hourly load plot

  10. Importing meteonorm data: sometimes kept previous GHI definition

  11. SolarEdge: fractional MPPT didn't work anymore

  12. Found deep error sometimes in the Synthetic Hourly dialog (=> Site
    corrupted). may explain many unidentified crashes of the software in diverse situations

  13. Securized messages when a VCi file is invalid

  14. Batchmode: Backtracking changes not taken into account

  15. Batchmode: 3D scene not actualized with some parameter changes

  16. System verifications: some possible errors not accounted (e.g. Module sizes)

  17. Import/export projects and components improved.

  18. Fixed issue with latest available Pvsyst version.

  19. Added proxy support for internet access (Preferences >> Web).

  20. Added window autoscrolling for small screens.

  21. Enabled unicode support (for ex. Asian characters) for user data file paths.

In Version 6.10 (23.07.2013) :

  1. Shading on diffuse factors not calculated for other systems than tracking - Don't use V6.0.9 !

  2. GoogleMap tool has changed, search by Map not working anymore: update of PVsyst accordingly.

  3. Diffuse shading factors for tracking systems: were computed with Shading Factor Table with tracking => error Backtracking now calculated for several tracker positions.

  4. Pump definition: dialog for definitions acc. to efficiency not working. Included a new line of contrifugal industrial pumps in the database.

  5. Little updates in the importation of Meteo files, esp Satellight.

  6. Corrected Horizon in Meteonorm, bad defined for southern hemisphere.

In Version 6.09 (19.07.2013) :

  1. GoogleMap tool has changed, search by Map not working anymore: update of PVsyst accordingly.

  2. Diffuse shading factors for tracking systems: were computed with Shading Factor Table with tracking => error Backtracking now calculated for several tracker positions.

  3. Pump definition: dialog for definitions acc. to efficiency not working. Included a new line of contrifugal industrial pumps in the database.

  4. Little updates in the importation of Meteo files, esp Satellight.

  5. Corrected Horizon in Meteonorm, bad defined for southern hemisphere.

In Version 6.08 (27.06.2013) :

  1. LID and Light-soaking loss parameter not written on the file.

  2. Securization of the ohmic loss dialog (sometimes crashes).

  3. Simulation with voltage limit for getting full Pmpp: error fixed.

  4. Report: Nb of inverters not correct with unbalanced MPPT suppression of the NOCT info line  (not relevant).

  5. Synthetic generation: Diffuse renormalization to input values not effective Wind velocities created by Meteonorm without input data.

  6. Satellight import: error in the avaraging over 5 years.

  7. TMY2 import: modif for accepting little imperfections to input format.

  8. Stand-alone and pumping systems: error at simulation beginning.

  9. System sizing, Shading dialogs: sometimes crashed.

  10. Meteo data import: accept solarimeter azimuth over ±90°.

  11. Logo not visible in report: fixed.

In Version 6.07 (29.05.2013) :

  1. TMY3 import: still errors with some locations.

  2. Satellight meteo data: added an automatic  6 minutes time shift.

  3. In Project's site definition: securized copy  Meteo => site.

  4. Master/Slave operation: fixed in simulation and module layout.

  5. SolarEdge, fractional inputs: fixed efficiency and overload.

  6. Helios3D import for southern hemisphere: still some angle definitions errors.

  7. Sometimes empty meteo data: additional warnings, securized System definition.

In Version 6.06 (26.04.2013) :

  1. TMY3 import: extended accepted separator to semicolon => possibility of modifying CSV file in EXCEL.

  2. Shading factor "according to string" calculation: sometimes error when 2 shades in the same rectangle.

  3. Solaredgs systems with fractional inverter: still an error in the simulation.

  4. Heterogeneous fields with only mixed field: didn't appear in choices.

  5. Hidden parameters edition: "Miscellaneous" topic had disappeared.

  6. ModuleLayout: default value for nb. of diodes now according to module def.

  7. Fixed character issues in simulation report.

In Version 6.05 (12.04.2013) :

  1. Systems with overload: calculation error in some cases (=> over-evaluated loss).

  2. Shadings with partition in module strings: sometimes hangs up.

  3. Import TMY3 format: extended possibilities for other sources (SAM in India). Now possible to import specific years, leap years, data source modifiable.

  4. Import of meteo ASCII files: extended to some very strange data formats.

  5. Import of Standard PVsyst format: added a parameter for time stamp hour shift. Adapted for importing DHI + DNI measurements.

  6. Tracking frames: extended accepted angle limits.

  7. Inverter definition dialog: sometimes crashed.

  8. Meteo data tables: Last day missing.

  9. New installation per-machine.

In Version 6.04 (21.03.2013) :

  1. Slight error in the module database;

  2. Import of PVGIS data: adapted for Internet Explorer 10;

  3. Solaredgs systems with fractional inverter inputs did'nt work;

  4. Display of  IAMLoss and ShdLoss values.

In Version 6.03 (19.03.2013) :

  1. Import Satel-light data: updated, the original source format has been changed.

  2. Low-light data specifications for PV modules: improved the dialog

  3. Import of ASCII meteo files: error with new Meteo files definition of V6.

  4. Database update.

In Version 6.02 (28.02.2013) :

  1. Mismatch tool: crash if PV module of the project not yet defined calculation on Inverter inputs, not the full sub-array

  2. Batch Mode tool: new parameters, update creation of hourly files

  3. File creation for simulation: memorization of the specified variables

  4. Project: displaced several settings of the Hidden parameters, specific to the project, to the project's settings

  5. Project: Add. settings: choice for Vmax IEC or UL  

  6. Oportunity of using muVoc specified instead of from model.

New Version 6.0 BETA (05.02.2013)


  1. "Meteonorm Inside"


    - Direct search of any location on the earth, using the well-known GoogleMap tool.
    - Immediately get the monthly meteo values for any site, using the interpolating possibilities of Meteonorm 6.1.
    - Synthetic generation of hourly values uses now the Meteonorm algorithm, improved by respect to the old PVsyst algorithm.
    - Included import of meteo values from new databases, for example SolarAnywhere (SUNY model) satellite recent data covering the whole USA.
    - Transposition model on tilted planes: Perez model now proposed as default instead of Hay, leqading to an increase of 0
    - 2% yearly sum according to climate and orientation.



  2. New Project management and simulation process


    - New Project management Dashboard, with direct access to all parameters, simulation and results in a single dialog.
    - Improved project management: copy, saving, transfers of calculation versions from projects to projects, copy of full projects.
    - Losses: new organization of the loss diagram. New losses like LID, System unavailability, Inverter auxiliary or night consumption, Light-soaking gains for CIS.
    - Batch mode for parametric studies: allowing to vary parameters in an EXCEL document, and get chosen simulation results of multiple runs as a table.



  3. Improved shading calculations


    - Direct shading factor calculation during the simulation (avoiding the interpolation uncertainties in the shading factor table).
    - Optimization of the calculation of the shading factor, allowing calculations of big PV plants without limitation to some hundredth of trows or trackers (factor of 10 on the speed).
    - Plants following the terrain, imported by Helios3D: analysis of the spread of orientations, management of the orientation average.



  4. Detailed electrical shading losses


    - Refinement of the "module layout" part, which allows to define the position of each PV module on the areas ("tables") defined in the 3D shading tool.
    - Modules arrangement in portrait or landscape, sub-modules in length or width within each module.
    - Attribution of each module to a given string and inverter.
    - Detailed calculation of the I/V characteristics under partial shadings in each Inverter input, either as pedagogic plot, and during the simulation for the determination of the "electrical losses" due to the shading mismatch.



  5. PV modules


    - Tools for specifiying low-light performances, and adjustment of the Rserie parameter accordingly. Low-light efficiencies may be included in the parameters in the database.
    - Modification of the default values for Gamma, when Rseries is not explicitely defined by the manufacturer, giving significant higher yields of 2-3%.
    - Import of a measured I/V curve for the establishment of the model's parameters. - Sandia model implementation, and comparison with the one-diode model.
    - New parameters: IAM profile in the module's parameters, Vmax(UL) for use in US, full tolerance definition, LID for crystalline and Light-soaking for CIS.
    - Easy choice of modules by manufacturers.



  6. Inverters


    - Multi-MPPT with unbalanced inputs
    - define main and secondary inputs.
    - Additional parameters: transformer specification, CEC average efficiency for US, auxiliary and night losses.
    - Easy choice of inverters by manufacturers.



  7. Software Installation and Background


    - New file organization, with clear distinction between internal database and custom files.
    - New data management, easy copy of the the full custom data set from previous installations, no problems of Administration rights anymore.
    - Certified installing package by PVsyst SA, registered in Windows.
    - Easy automatic updates.
    - New protection management.





In this Version 5.74 (16.06.2014) :

  1. Large Database update (PV modules and Inverters)

  2. Import meteo data: also possible for Northern planes (+/- 180°)

  3. Stand-alone projects: export tool did't include the battery

  4. Sometimes error in User's load: ILoadMax too high (simultaneïty factor).

In Version 5.73 (30.01.2014) :

  1. Possibility of reading *.PAN and *.OND files from Version 6

  2. Conversion of ASCII files: revision of some features and error messages (multiple fields in DAM files, dates wthout year interpretations)

  3. Heterogeneous fields: bad writing of second azimuth parameter (only in V5.72)

  4. Southern hemisphere, mouse dragging: sometimes direction error.

In Version 5.72 (09.12.2013) :

  1. SolarEdge fractional MPPT input

  2. Simulation ASCII files: crashes if more than 30 variables required

  3. Seasonal tilt option: winter months not memorized

  4. Grid-system presizing: error in active area

  5. PV module import from PHOTON: tolerance value incorrect (*100)

In Version 5.71 (24.09.2013) :

  1. PVGIS import: the negative Longitude sign is not read correctly

  2. PV modules import:  PHOTON site has changed, updated accordingly

  3. Import ASCII meteo files: year 2000 not recognized as leap year

In Version 5.70 (26.08.2013) :

  1. Database update.

In Version 5.69 (19.07.2013) :

  1. Pump definition: not working with efficiency as specified parameter defined 25 new centrifugal pumps in the database.

  2. Horizon definition in Meteonorm: update acc. to azimut definition.

In Version 5.68 (27.06.2013) :

  1. Shading factor according to modules: sometimes freezes.

  2. Simulation with inverters specifying VmppMin for getting the nominal power:little calculation error.

In Version 5.67 (28.05.2013) :

  1. TMY3 import: now possible to modify files in EXCEL, some errors removed.

  2. Inverter overpower losses: some random errors (when Vmpp < Vmppmin).

  3. Shading factor according to modules: sometimes hanged-up.

In Version 5.66 (12.04.2013) :

  1. SolarEdge systems: error when using fractional (partitioned) inputs.

  2. PVGIS data: the format has changed with Explorer 10 (Windows 8).

  3. Meteo data tables: the last day was not printed.

  4. TMY3 format reading: extended to not-TMY (real years), also with leap years.

  5. ASCII import: extended for reading some very strange data format.

  6. PVsyst standard format: defined a new tag for the Time stamp hourly shift. Added possibility of importing  DHI+DNI data.

In Version 5.65 (19.03.2013) :

  1. Satel-light import: update, the source file format has changed.

In Version 5.64 (29.01.2013) :

  1. Financial balance with net-metering: error when defining consumption tariff

  2. Shadings acc. to module strings: little error in some rare cases

In Version 5.63 (21.12.2012) :

  1. Revision of the synthetic generation of temperatures
    (erroneous results in very unsolated climates in Southern hemisphere)

  2. PV module import from PHOTON database: didn't work with some international windows settings

  3. Comparison Measurements-Simulation tool: error since version 5.60 prevented simulation

  4. Helioclim data import: timezone not defined => proposed acc. to Longitude

  5. Path for data specified with diacritic characters in Czech MsWindows
    => suppressed diacritic characters in the datapath

  6. Securized initialisation procedure of the program.
    In some installations (lack of Windows reading rights), the program crashed.  

In Version 5.62 (27.11.2012) :

  1. Error in the calculation of DiffEff and Alb_Eff (info only: This is not used in the simulation).

  2. Database update

In Version 5.61 (12.11.2012) :

  1. Pumping systems: improved pre-sizing, especially in limit cases (worked fine - Securized calculations in some exotic situations,
    Corrected some little display errors.

  2. Stand-alone systems: since version 5.54, sometimes the battery used by the
    simulation doesn't correspond to the one chosen in the "system" part;
    then returning in "System" leaves the battery choice blank.

  3. PVGIS import for African data in southern hemisphere:
    error of the longitude sign => problems with time zone definition.

  4. Meteo checking tool: sometimes graph choice error with incomplete years.

  5. Simulation hourly graphs: units sometimes not displayed (especially Ah).

In Version 5.60 (05.10.2012) :

  1. Measured data: generates 1 full year (with 0 values) when only one day data (worked fine - generated just the available data -  for 2 days or more

  2. Measured array temperature checkbox: sometimes masked if Meteo of the project is changed

  3. Triphased voltage drop after inverter: evaluation error 15% (display only)

  4. Import of POA values: possibility of increasing the acceptance when the clear day model is overcome (specified in the hidden parameters)

  5. Lower limit of monthly ambient temperatures: now in Hidden parameters

  6. Report: the model used (Hay/Perez) doesnt appear correctly mete os changed.

  7. Loss diagram: opportunity of increasing number of decimals of the % losses

In Version 5.59 (18.07.2012) :

  1. Error freezing the program at PV module or inverter opening

In Version 5.58 (16.07.2012) :

  1. PHOTON database: the site URL and format has changed  =>
    update for reading by  Firefox, Chrome, Explorer

  2. PVGIS import: doesn't work anymore with Firefox 13 (modif. data format)

  3. Very undersized inverters: when Vmpp < VmppMin(Inv), overpower loss not accounted correctly => Output powers may be > Pnon(AC)  (marginal effect)

  4. Single amorphous modules model: modif Vbi for very high Vmpp

  5. Tracking tilted axis in Southern hemisphere: axis azimuth not correct

  6. Helios3D import in Southern hemisphere: Base slope sign not corect

  7. MeteoConversion process: abort when all dates are invalid (not read correctly)

  8. Regulator dialog: improved warning messages management

In Version 5.57 (29.05.2012) :

  1. Tracking, error when axis azim = 180°
       => Autorize negative tilt of axis,

  2. a:Si-H (single) modules: model modification for very high Vmp 

  3. Read Helios3D:  parameter correction for southern hemisphere

  4. Import of Meteo files: add date format possibilities

  5. Load daily and monthly definitions: dialog and report errors

  6. Transformer losses: values disappeared in some special cases

  7. Some modified inverters in the database: read error for effic. 3 voltages

In Version 5.56 (16.04.2012) :

  1. Read Meteonorm: problems (monthly irrad=0) near polar circle

  2. Inverter 3-voltages efficiency: OK if 2 voltages identical 

  3. Inverter and PVModule export to EXCEL:
         decimal dot or comma acc. to international settings

  4. Monthly tables: errors in units for Yr and Ya

  5. Report: corrections (economics) and improvements (shadings)

In Version 5.55 (21.02.2012) :

  1. Transformer iron Loss: was taken as proportional to the system output. Iron losses  are constant losses, even during night.

  2. Opportunity of switching OFF the transformer during the night, for avoiding night iron losses.

  3. Wiring resistance in AC part:
    Increased reliability for very high diameters, specific current limit
    Indication of undersized wires regarding max. admissible current
    New Help for the maximum admissible current acc. to IEC

  4. Loss diagram: secured units (sometimes not well intialized: W or kW)
    Pumping: unreadable when too high losses for full tank.
    Pumping: div. by 0  

  5. Read Helios3D files:
    Additional tag for not-grouping tables in sets of sheds
    Increased tolerance for orientation mismatch (hidden parameter) 

  6. PV module definition: extended limits for big modules (CPV)

  7. Additional securisation for projects over the polar circle

  8. Legal time - Solar time limit: extended in hidden parameters (China sites)

In  Version 5.54 (17.01.2012) :

  1. Modernize battery database, update with several battery models

  2. Sheds with sloped base: error in south hemisphere

  3. US TMY files: accept measurements of specific years and leap years

  4. Database update

In Version 5.53.2 (16.11.2011) :

  1. Suppression of spectral correction in CdTe modules

  2. Errors in measurement-simul. comparisions graph definition

  3. Database update

In Version 5.53.1 (03.10.2011) :

  1. Error when changing the meteo file in a project

  2. Errors in some inverter's data (nominal current)

  3. Database update

In Version 5.52 (29.08.2011) :

  1. Final report: opportunity of changing kWh <=> MWh

  2. Display errors in financial part (currency not updated)

  3. Import of PVsyst standard meteo data: diffuse model not calculated,errors in dialog when temp. not defined

In Version 5.51 (25.07.2011) :

  1. Error when defining orientation

In Version 5.51 (22.07.2011) :

  1. ModuleLayout: Shading electrical calculation pedagogic tool. Manually put a shading surface on the array, and see the electrical effect

  2. Define a standard file format in CSV for import of hourly data.

  3. Direct import of Meteo data from SolarGIS and 3Tiers (whole world, for pay) in PVsyst standard format.

In Version 5.50 (06.07.2011) :

Development and distribution passing from the University of Geneva to PVsyst SA.


  1. Errors in the Grid connected system with load definition (net metering)

  2. Tables and graphs of Measured Global in Plane and Measured Array Temperature.

  3. Errors in Vmpp plots (limits).

  4. Database now includes 7'200 modules and 2'000 inverters.

In Version 5.42 (25.05.2011) :

  1. Bugs fixes in Conversion of ASCII files (Daylight Saving Time, DNI import, etc)

  2. Bug fix in the Meteo calculations in monthly values (since V 5.4)

  3. Horizon import: updates for Format change in Meteonorm, dot accepted in filenames

  4. Model used (Hay or Perez) now can appear on the report

  5. Database update, slight modification for a-Si:H single modules modelling

In Version 5.41 (04.05.2011) :

  1. Import Measured Temp. array in the meteo data and use in the sîmulation.

  2. Some bugs when importing meteo data (DNI, diffuse when timestep < 1H, etc).

  3. Revised and improved import of Helios3D ground data.

  4. Improved plots of measured data.

  5. Wiring of very big systems: increased cable max. sections

In Version 5.40 (01.03.2011) :

  1. Import of meteo data ASCII files. Bugfixes for some specific files.

  2. Import of pure DNI data without Global Horizontal.

  3. Time Shift when importing GlobH (for DiffH calculation), POA or DNI data.

  4. Clear sky model improvement.

  5. Module Layout: bugfixes.

  6. Grid simulations with net-metering: variables and Solar fraction bugfixes.

  7. Import / Export of all database elements modified by the user.

  8. Export of LOG files as ZIP files for debugging.

  9. New AutoUpdater tool for software and database updates.

In Version 5.31 (15.12.2010) :

  1. Import Helioclim data: diffuse was not defined.

  2. Bugs fixes: loss diagram, Help in Meteo import, countries with Upcase.

In Version 5.30 (30.11.2010) :

  1. Help system: completely new CHM version, now fully compatible with Windows 7. A PDF version is available on the site. Direct link for importing PV modules and Inverters from PHOTON database.

  2. New tool for the Meteo data quality check: (Kt plots, clear days check) Implemented middle-interval shift for optimizing treatment of not-centered meteo data.

  3. Importing meteo data from Global Incident (POA) measurements: bug fixed POA measured value now in the recorded data.

  4. Concentrating PV module (CPV): definition with spectral corrections.

  5. Concentrating systems: complete revision of the simulation process / variables.

  6. Update of the loss diagram: also for concentrating systems.

  7. Inverter definitions, some bugs fixed: 3-voltage reading, bi-polar sizing.

  8. Heterogeneous fields:files V 4.37 prevent simulations (0 everywhere).

  9. IAM calculation on diffuse:also with customized IAM function. 

In Version 5.21 (3.09.2010) :

  1. Modules and Inverters database: Direct link for importing PV modules and Inverters from PHOTON database.

  2. Shadings: define a new object (mansard, or roof-window).

  3. Favorites list: choice in the main Database lists easier (by right click).

  4. Filenames: Directory Names now accept accents and some special characters (solving problems with Czeck Republic Windows XP installations).

  5. Meteo data: the wind speed is now part of hourly values when defined monthly.

  6. Inverters: still problems with 3-voltage efficiency definition (solved). 

  7. Sun-shields: bug during mutual shading calculations. 

  8. Bugs fixes: printing of PR, soiling table in parameters, etc.

In Version 5.20 (3.08.2010) :

  1. Important ! File organization and localization has been changed: Your working \Data\ structure is now in a writable area (avoiding delocalization of files written by PVsyst under Vista and Win7). 

  2. Module layout tool for the geometrical arrangement of your system. 

  3. SolarEdge: special option for decentralized architecture with Powerboxes. 

  4. Fixed bugs in Inverter definition, Projects, Latitudes over polar circle, etc.

In Version 5.14 (30.06.2010) :

  1. Autoupdate: bug correction. On some machines, for unidentified reasons (firewall, proxy, ?) the AutoUpdate functionality induces crash at the opening of the software

In Version 5.13 (25.05.2010) :

Bugs correction:

  1. Autoupdate: freezing at opening on some Windows installations (web access).

  2. AC loss: now possible after inverter or after external transfo.

  3. AC loss: bug when identifying mono/tri situation.

  4. Heat loss default values: bug, not always possible to change value.

  5. Stand-alone, economic evaluation: bug fuel consumption.

  6. Stand-alone, Available energy and Time fraction: bugs when very bad design.

  7. Simulation: bug Hourly plots for some variables.

In Version 5.12 (25.05.2010) :

  1. PV modules definition:

    - show the apparent Series resistance (Rsapp, different from Rsmodel).

    - Efficiency plots vs. irradiance: display low-light values.

  2. Still bugs for the automatic update: (freezed the program in some cases)

In Version 5.11 (29.04.2010) :

  1. Bug when importing some meteo data (PVGIS and Helioclim) .

  2. Animation video file (*.avi): now compatible with Windows media Player.

In Version 5.10 (25.03.2010) :

  1. Automatic auto-update for new versions: PVsyst automatically checks and installs new version updates.

  2. Tool for the analysis of electrical effect of cell shading: Extended to several cells, in one or several sub-module (groups protected by one by-pass diode).

  3. Generic (unlimited) shed shadings: Electrical effect of shadings on the first cell row and string.

  4. Mismatch: histogram for the study of statistical loss distribution.

  5. System design reference temperatures: now part of each project.

  6. 2-axis tracking: shadings compatible with concentration option.

  7. Help: tutorial for project design and meteo data.

  8. Language switch: F10 key for directly switching english / local language in most dialogs.

  9. Helioclim data: updated tool according to the new web site data format.

  10. Bi-polar inverters: defined bi-polar inverters in the system design and simulation.

  11. Inverter: bug when efficiency not well defined.

  12. Heterogeneous fields: still bugs in area calculations and mixed fields.

  13. Shading animation: video recording of the shading scene now works.

  14. Stand-alone systems: bugs in regulator definitions and system verifications.

  15. Array voltage: Array voltage was not registred in the simulation.

  16. Export project tool: error warning, corrected.

In Version 5.06 (26.01.2010) :

  1. Vista and Windows 7 64-bit compatibility: parenthesis were not allowed in the default directory \program files (i86)\ proposed by Windows .  

  2. PV model: saturation current Io limit down to 0.1 pA (problems at low temp.)

  3. Helioclim data: the provider have modified the site's format => readapted the program for a compatible easy importation. bugs with master/slave definitions (sometimes divisions by 0) possibility of Strongly Oversized inverters (by modif. Hidden parameters).

  4. Shading calculations sometimes freezed. Improve reliability of shading calc.

  5. Near shadings: near shadings, elementary objects, autorized tilt < 0°.

  6. System dialog: did not keep the defined parameters when rentering the dialog.

  7. Inverter database: terminated the update according to Photon Magazine 2009.

  8. Help: tutoriel for the 3D shadings and for your first project.

In Version 5.05 (18.12.2009) :

  1. Stand-alone systems: bugs in the Regulator dialog and the simulation process.

  2. Grid system sizing tool: still another deep revision for more conviviality bugs with master/slave definitions (sometimes divisions by 0) possibility of Strongly Oversized inverters (by modif. Hidden parameters).

  3. Inverter for 3 voltages: still some little improvements).

In Version 5.04 (21.11.2009) :

  1. System definition freezed when defining multi-MWc systems. No more limit to the system size.

  2. System sizing tool improved.

  3. Corrected further bugs in the report (sometimes over-printing at head of the page).

  4. Improved the ordering tool (sometimes e-mails were not well sent, and we did not receive your order)

In Version 5.03 (10.11.2009) :

  1. Corrections in the Grid-system sizing tool: (MPPT inverters, not yet perfect !).

  2. Colors: some background colors make things unreadable in Vista and Windows 7.

In Version 5.02 (26.10.2009) :

  1. System definition freezed when defining multi-MWc systems. No more limit to the system size.

  2. System sizing tool improved.

  3. Corrected further bugs in the report (sometimes over-printing at head of the page).

  4. Improved the ordering tool (sometimes e-mails were not well sent, and we did not receive your order)

In Version 5.01 (12.10.2009) :

  1. Important bug correction: We just discover a important bug: in some cases (synthetic generation without specified Diffuse monthly values), the Diffuse is very low, leading namely to over-estimated transposed values (GlobInc). Please reinstall this new version, and open the projects elaborated under V 5.0. If this occurs, the program will give a warning, re-calculate the meteo file, and you should re-simulate all your calculations for this project. Please discard the old inputs of such erroneous projects.

  2. Help improved: Help improved for system design and inverter sizing.

In Version 5.00 (06.10.2009) :

This is a major modernization of the software. Many internal mechanisms have been improved since more than 2 years of development (in parallel to version 4.xx updates). Therefore there may be bugs which have not been detected during the development. Please be so kind as to report them carefully to the authors.

  1. Multilanguage: the simulation report was already available in several languages, but now the software itself is (partly) available in English, French, German, Italian, Spanish and soon Portuguese. This is not yet a full translation: only the most used parts - especially regarding grid connected systems - were translated up to now. This is a very time-consuming job (more than 200 dialogs, and hundreds of information/warning pieces to the user), and we will continue it progressively. On the other hand we don't intend to translate the Help at the moment.

  2. Multi-fields: you have now the opportunity of defining several field types for a given project (with different PV modules or inverters, number of modules in series, etc). Their parameters are detailed on the final report, but the simulation results concern the whole installation.

  3. Inverter: their definition includes many parameters which were not operational in the simulations up to now. Multi-MPPT devices: you can define a specific sub-field for each input. Possibility of Master/Slave operation: the Inverter's cascading is taken into account in the simulation process. For some models: power limitation when running under a specified input voltage, is now taken into account. Efficiency profile for 3 different input voltages.

  4. Heterogeneous orientations: systems with 2 different orientations may now involve different sub-fields in each orientation, and/or a subfield for which the strings of a given inverter are distributed on both orientations (with mix of the I/V curve for correct calculation of the MPP).

  5. Database management: the big lists of components stored as individual files, which took very much time to be loaded in the previous version (and sometimes caused bugs) are now replaced by centralized databases (CSV files). This results in an immediate access, and facilitates the updates of the DB of the software. Only the files you are creating or modifying by yourself will still be stored as individual files as before. This concerns: The PV modules (which should approach 5'000 modules in the DB of 2009), The inverters, The geographic site database (of which the list shows now the source of data).

  6. Favorites: you can now define a list of your favorite components in the database, which drastically simplifies the use of big component lists.

  7. Near Shadings: the full dialog and tool have been improved. You can now: Easily read and write a scene or a building directly from the 3D tool. Multiple selection allows to define groups of objects, that you can replicate or save on a file. Define/fix the characteristics of the view you would like to appear in the final simulation report. Register the shading's animation as a little video.

  8. Special tracker devices with PV modules rotating on a tracking frame (with either N-S or E-W axis), are defined as special shading objects (with database of existing devices).

  9. Shading of thin objects, like electrical wires or handrails, is now possible by weighting their effect on the "Module shading" part of the shaded areas.

  10. Shading on strings: you can put a weight on the effect of the shading according to strings, in order to better approach the real shading effect on the electrical production (not only an upper limit) in the simulation.

  11. Import Horizon profiles directly from Somletric SunEye, Carnaval software, Meteonorm.

  12. Synthetic hourly data generation: the diffuse part may be renormalized to specified monthly data when available. This was not possible in the previous versions.

  13. Improvement of the sizing tool for grid systems. You have now the opportunity of specifying either the nominal power, or the available area as starting point. The software indicates the required ranges for the number of modules in series and in parallel. A new powerful window shows all the constraints when sizing a field, i.e. The voltages of the operating array by respect to the inverter's specifications, Histogram of the waited power production of the array, compared to the inverter's nominal power. Estimation of the overload losses (and visualization of their effect on the histogram). This tool allows to determine precisely the ratio between array and inverter Pnom, and evaluates the associated losses.

  14. The default losses management has been improved, especially the "Module quality loss" which is determined from the PV module's tolerance, and the mismatch on Pmpp which is dependent on the module technology.

  15. Losses between inverters and grid injection have been implemented. These may be either ohmic wiring losses, and/or transformer losses when the transformer is external.

In Version 4.37 (June 2009) :

  1. New installer and installing file (old one has problems with new XP).

  2. Few new modules in the database.

  3. Easier registration process (direct access to e-mail editor).

In Version 4.36 (April 2009) :

  1. CdTe modules: the module definitions of the old database are affected by the new recombination losses. Recreated files in the database for all CdTe modules, including recombination term according to our recent measurements at the University of Geneva.

In Version 4.35 (March 2009) :

  1. Import of Meteo data:some bugs fixed:

    • Bug in some new files of Meteonorm V 6.0 (containing leap years)

    • Bug in some TMY3 files 

  2. CdTe PV modules: according to our detailed measurements:opportunity of defining Recombination Losses

  3.  Shading factor calculation (especially diffuse): bug when the plane azimuth is very unusual.

In Version 4.34 (February 2009) :

  1. Database: PV modules from manufacturers (especially many amorphous) and new inverters.

  2. Tool for analysing shading of one cell in an array: Improvements, shows not shaded I/V charact. and Pmpp loss.

  3. Meteo data import:

    • US-TMY3 Import implemented (1020 stations available)

    • Satellight: Bug temperatures when importing 5 years at a time.

    • PVGIS: Bug all months accounted as 31 days (overestimate 1.6%).

    • PVGIS: Now uses PVGIS site new interface, much more convivial.

    • Meteonorm: Monthly files: still discovered a new format variant.

    • Temperatures: Possibility of importing NASA data, always available.

  4. Tracking tilted axis: error when axis azimuth not south.

  5.  Measured and Meteo data: little bugs (extended available date formats)

In Version 4.33 (October 2008) :

  1. Database update: PV modules and Inverters from "Photon Magazine 2008" (3120 modules and 1123 inverters are now available).

  2. Meteonorm import: tolerant to another (not yet registred) file format.

Some bugs fixed :

- Error in importing temperatures from Satellight data corrected.

- Lost of simulation results at each reloading of a calculation version corrected.

- Error in the GlobShd evaluation (but wich didn't affect the final results) corrected.

In Version 4.32 (July 2008) :

  1. Database: Inverters update from "Photon Magazine 2008" (PV modules 2008 are not yet available).  

  2. Loss diagram: incoherences in the shading and IAM relative losses (only display in this diagram - simulation results were correct).

  3. Ascii Meteo importign tool : date management improvement, site names beginning by "New" are now possible.

  4. Search Edit for easier choice in big component lists.

  5. Print Preview: easier navigation through pages.

In Version 4.31 (June 2008) :

Some bugs fixed :

  1. Satellight data import: Temperatures were not well imported.

  2.  PVGIS import: copy/paste did not work with some internet browsers.

  3.  Site/Meteo choice for Projects: generated erroneous meteo files

  4.  Simulation report: erroneous tables overwrited parameters (namely IAM)

  5.  Import of Meteo ASCII files: improvements for daily data and date formats.

  6.  Long component's lists: edit box for direct access to a given item

In Version 4.3 (March 2008):

  1. Import of meteo data from multiple popular sources (NASA, WRDC, PVGIS, RetScreen, Helioclim).

  2. Comparison between several Meteo Data sources.  Developments and results in the Help.

  3. Import/Export of "Site" monthly data from/to EXCEL.

  4. Improvement of the Meteo hourly files management (site and comment now editable/exportable).

  5. Implementation of Tracking with vertical axis, also useable with positioning of modules on a "dish"

  6. Module temperature calculation: revision (new parameters, absorption, etc).

  7. PV model for amorphous: parameter determination according to a specified  muPmpp  value. Adjusment of all triple-junction module parameters in the database.

  8. Bug Tracking: azimuth sign error in south hemisphere: the tracking was reversed !

  9. Bug Shadings, polygonal fields: rewritten the whole modules calculation.

In Version 4.21 (August 2007):


  1. Some youth bugs of version 4.2 are now fixed.
    The more relevant one:
    with tracking 2-axis, the collectors returned to their default position (30° south) when the sun's azimuth was under -90° or over 90°. Now they take this position only by night (sun height < 0). This caused an unexpected loss of the order of 7% in sunny regions.

  2. Others:
    "Transfer projects" option was not working properly.
    Near shadings: erroneous message in some cases.
    Soiling parameter definition was hidden. Etc...

In Version 4.2 (July 2007):

  1. Improvement of the navigability in the 3D construction tool, copy/paste of an object from one variant or project to another one. Automatic verification of the Field interpenetration (or tangency) with another object, which may prevent good shading calculations.

  2. Backtracking strategy with all tracking systems, involves tracker width and distance definitions.

  3. Sun-shields definition in the 3D tool; also with backtracking, which may considerably improve the sun-shield's performances.

  4. High-Concentrating systems simulation, associated with 2-axis trackers; adaptation of the simulation process and loss diagram.

  5. Long-term financial balance tool, including several Feed-in tariff strategies (day/night or seasonal variations, feed-in and self-consumption tariffs, etc) and system ageing.

  6. Soiling parameter included in the simulation and loss diagram, with opportunity of defining monthly variations.

  7. Direct import of meteo values from NASA-SSE database over the whole earth (by 1°x1° cells), and practical procedure for importing meteo values from WRDC database, especially for countries where METEONORM data are scarce.

  8. Improved the model for amorphous PV modules, especially safety of parameter boundaries, and behaviour presentation to the user.

  9. Improved the Project dialog and choice of a site/meteo. Improved compatibility checks between the project's site and hourly meteo. Extraction/edition of the site geographic properties within an hourly meteo file, which was not possible up to now.

  10. Database update, with PV modules and inverters of 2006/2007 (now around 2250 PV modules and 860 inverters).

  11. Adaptations for Windows VISTA OS, especially concerning the visual interface. All other functions seem to be perfectly compatible.

  12. Introduction of many "Logs" in the program, in order to facilitate the debugging of user's problems.

In Version 4.1 (January 2007):

  1. The Simulation output reports are now available in French, German, Spanish, Italian (useful for presenting the PV system characteristics to customers).

  2. Windows user's rights compatibility: The \DATA\ structure has been modified for compatibility with the user's rights protections in Windows. A user without writing rights can now copy the whole DATA structure for use in his own writable area. Data may be shared - or not - between different users of the machine.

  3. Files and projects transfers: Archiving or importing projects, as well as database updating tools have been improved.

In Version 4.0

Pumping PV systems

3 types of PV systems are implemented: deep well, pumping from lake or river, and pressurization for water distribution.
These may be simulated with a great variety of system configurations, and for any pump type.

The pumping systems are usually constructed according to the pump's manufacturer recipes, which give only an idea of the pumped water for a typical good day in standard conditions. This tool evaluates the pumping performances of a great variety of technological solutions, for a given location and meteo conditions, and related to the real user's needs all over the year.


This implies the development of an original model for describing the pump's behaviour.
This model
applies to any pump type, and may be established according to usual manufacturer's specifications.
A database of about 100 available pump models is available (should be enriched in the near future).

The pump's electrical characteristics in any operating conditions are especially required for the simulation of pumping systems with direct coupling between the PV-array and pump (or their improved versions like booster, pump cascading or PV array reconfiguration).
But the simulations show that MPPT power converters - now currently available - noticeably improve the pumping system performances.
The results will help to choose the best economical solution.

In Version 3.41

  1. Automatic facility for importing meteo data from the Satellight Project, real data available free from the web for any pixel of about 5x7 km² in Europe. These data become better than terrestrial measurements, as soon as you are distant of more than 20 km from the measuring station. You can choose among five years of full data (1996-2000).

In Version 3.4

New modelling procedure for the amorphous modules
This procedure was established and validated using the results of a research project performed at CUEPE, funded by the SIG-NER fund (the SIG - Services Industriels de Genève - are the Geneva Electric and Gaz Utility). This project included detailed long-term measurements of 6 PV modules in real conditions. It also gave a quantified validation of the standard model for crystalline and CIS modules.
Extended component database
Over 1'750 PV modules and 650 inverters are now referenced, with dates for identification of market availability or obsolete components. With such big lists, a mechanism for quick access time had to be implemented.


Near shading 3D tool
View of the shading scene in realistic colors (settable by the user for each object) - instead of "iron wires" representation - improves the understanding of complex scenes, and gives a much more attractive image of the project for the final customers.
Animation over a whole chosen day also clarifies the shading impact of a given situation.
Implementation of tracking planes in the 3D shading tool.
Especially suited for the optimisation of heliostat arrays layout.

Review and improvement of the Simulation Process
Clarification of the losses at any stage of the system, extension to battery systems with DC-DC converters, rewriting of the heterogeneous field treatment , etc.
Detailed loss diagram
Gives a deep sight on the quality of the PV system design, by quantifying all loss effects on one only graph. Losses on each subsystem may be either grouped or expanded in detailed contributions.
Restructuration of the internal representation of the physical variables
These two last improvements were made possible thanks to a very deep revision of the internal data structure, in order to obtain more flexibility when using the simulation variables. This reorganization is transparent for the user, but allows now many enhancements of the simulation process, namely easy adding of new variables when necessary, including them dynamically in the simulation process according to specific system configurations, or inversely discarding other ones when they are not relevant.




In this Version 5.53 (03.10.2011) :

  1. Error when changing the meteo file in a project

  2. Errors in some inverter's data (nominal current)

  3. Database update


System verifications: some possible errors not accounted (e.g.
Module sizes)