Skip to main content

Greenbyte Documentation

Grid Meter/Production Meter Performance Ratio

The Performance Ratio for Production meters and Grid meters is an aggregated metric of the solar PV system. It compares the meter’s actual energy to the sum of all inverters’ (connected to that meter) potential energy for when irradiance is above cut-in. The Performance Ratio can be used to find sites/sub-sites/inverters that under-perform during normal operation.

Technology

Solar

Remarks

Required metadata fields:

  • Performance Irradiance Cut-In (W/m2) (Inverter metadata 13), for reference inverters/inverters in site

  • Performance Irradiance Cut-In (W/m2) (Device metadata 16), for meter

Equation
Grid_Meter-Production_Meter_Performance_Ratio_-_Equation.png

Where:

PR

is the Grid Meter Performance Ratio/Production Meter Performance Ratio

Egrid

is the Energy Export Meter, used for a Grid meter

EGMS

is the Energy Export GMS Meter, used for a Performance meter

I

is the average Solar Irradiance Reference Meter for Inverters

Cut-inIP

is the Performance Irradiance Cut-In (W/m2) (Device metadata 16) for meter

Pp,i

is the Cascading Potential Power - Solar for inverter i

Cut-inIP,i

is the Performance Irradiance Cut-In (W/m2) (Inverter metadata 13) for inverter i

T

is device resolution in hours

Epotential

assumes 10-minute data.

Note

For other device resolutions, the denominator will be different.

Inputs
Grid_Meter-Production_Meter_Performance_Ratio_-_Inputs.png
Usage Example
Grid_Meter-Production_Meter_Performance_Ratio_-_Usage_Example.png