Performance ratio calculator

Plain PR and temperature-corrected PR for one reporting period. A design aid; use your monitoring system for contract figures.

Array size, kW DC at STC

AC energy in the period, kWh

Plane-of-array sunlight, kWh/m²

Sunlight-weighted module temperature, °C

Power temperature coefficient, %/K (negative)

Optional: annual weighted temperature, °C

Plain PR: -

Corrected to 25 °C: -

Corrected to annual weighted temperature: -