Below you will find the 15min PR calculation formulas
Raw PR (site level)
Raw PR=(Exported Power Site/ Nominal Power DC)/(Irradiance PoA Average/1000)
AL-corrected PR (site level)
AL-PR=Raw PR/Availability
Raw PR (inverter level)
Raw PR=(Power Inverter AC/ Nominal Power DC)/(Irradiance PoA Average/1000)