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Impact on the inverter overload conditions

Requesting the inverter to produce reactive energy may affect its overload conditions, depending on its nominal power specifications:

  • either the nominal power \(P_{Nom}\) is specified in active power [kW]. In this case, the production of reactive energy doesn't impact the overload conditions and the active energy produced by the inverter is independent of the requested Power factor.
  • or the nominal power \(P_{Nom}\) is specified as apparent power [kVA], so that the power limitation will occur for an active power $$ P_{Nom}(act)[kW] = P_{Nom}(app)[kVA] × \cos(\phi) $$ As \(P_{Nom}(act)\) is lower, the overload loss will be higher, and depends on the specified \(\cos(\phi)\).

In this second case, one should consider adapting the dimensioning of the DC / AC ratio to mitigate those losses. After you defined a requested power factor in the Energy management window, the estimation of the overload losses in the System menu will take into account its effect (denoted "Overload loss, with PF").

Modification of the cos(phi)

Note: Since the version 7.3.3, each inverter operates according to its own \(P_{Nom}\) specification, i.e. either defined as active or apparent. The derogation options "Force as apparent/active power" will force all inverters to operate under a single definition, without modifying the .OND file. This has been kept here for compatibility with old versions < 7.3.3, and for possible tests, but this is not recommended. This should only be used for tests.