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The mechanical power of a Hydraulic flow is basically the product of the fluid flowrate, by the head at which it is transferred.

When using usual units in PVsyst:

 P hydr [W]    =  FlowR [m³/h]  *  Head [Bar]  * 1000 / 36

or:        P hydr [kW]   =  FlowR [m³/h]  *  Head [Bar]  * 1 / 36

 

In the same way, the energy is related to the total water volume transferred

 E hydr [kWh] =  Flow  [m³]  *  Head [Bar]  * 1 / 36

or        E hydr [MJ]    =  Flow  [m³]  *  Head [Bar]  * 1 / 10

 

Calculation tool

You have a calculation tool for the evaluation of the Hydraulic power in any units, in the "System" dialog, page "Pump definition".