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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, reactive energy production does not impact 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 power limitation occurs at active power $$ P_{Nom}(act)[kW] = P_{Nom}(app)[kVA] × \cos(\phi) $$ Because \(P_{Nom}(act)\) is lower, overload loss will be higher and depends on the specified \(\cos(\phi)\).

In the second case, you should consider adapting the DC/AC ratio dimensioning to mitigate these losses. After defining a requested power factor in the Energy management window, the overload loss estimation in the System menu accounts for this effect (denoted "Overload loss, with PF").

Modification of the cos(phi)

Note: Since version 7.3.3, each inverter operates according to its own \(P_{Nom}\) specification—either active or apparent power. The "Force as apparent/active power" options force all inverters to operate under a single definition without modifying the .OND file. These have been retained for compatibility with versions < 7.3.3 and for testing, but they are not recommended. Use them only for testing.