Power
Power of solar modules. It is measured in STC (Standard Test Conditions) STC: Radiation 1000 watt/m2 with a spectrum of AM 1,5 at a cell temperature of 25°C.
Some manufacturers give data at Nominal operating cell temperature NOCT: Radiation 800 Watt/m2 with a spectrum of AM 1,5 at a surroundings temperature of 20°C and a nominal operating cell temperature of 48,2°C.