This calculation flags periods where actual DC Voltage is higher than expected, as it potentially indicates reduced AC Capacity. The flag is an input to the reduced AC capacity smart event.
Importance: to identify when an inverter is forcing its array to operate away from its Max Power Point (MPP), an indicator of reduced AC capacity
Schedule: runs once overnight on all inverters of a given site
Relevant sites: PV sites
Historical data needed: day of
![\begin{document} \[ \textit{Subarray.ExpectedVoltage} = \textit{Subarray.NominalDCVoltage} \times \textit{Subarray.ModulesPerString} \\ \times \left( 1 + \left( \frac{\textit{Subarray.TemperatureCoefficientOfNominalPower}}{100} \right) \times \left( \textit{PlaneOfArray}_{\textit{Subarray}}.\textit{ModuleTemperature} - 25 \right) \right) \] \[ \textit{Inverter.ExpectedVoltage} = \frac{\sum_i \textit{Subarray}_i.\textit{ExpectedVoltage} \times \textit{Subarray}_i.\textit{DCCapacity}}{\s](https://paligoapp-cdn-eu1.s3.eu-west-1.amazonaws.com/powerfactors/attachments/09ca6c27a3f7f1fc26b2b07766deb538-9b7ced17cbb2b01571eea8d0f9a260fa.png)
Segment Apcode | Mloc Apcode | CalcType | CalcPeriod | MType | Notes |
|---|---|---|---|---|---|
Inverter | EffectiveIrradiance | Calculated | siteTR | Irradiance | |
Inverter | DCVoltage | Mean | siteTR | Voltage | |
PlaneOfArray | ModuleTemperature | Final | siteTR | Temperature | |
PlaneOfArray | ModuleTemperature | CascadeFlag | siteTR | Temperature |
Segment Apcode | Setting Apcode | Notes |
|---|---|---|
Subarray | DCCapacity | |
Subarray | ModulesPerString | |
Subarray | NominalDCVoltage | Voltage at Max Power |
Subarray | TemperatureCoefficientofNominalPower | % / degree C change in (Power or Voltage) |
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