• GTIGlobal TiltedIrradiance[kWh/m2]Average value, collected by the calibrated tilted pyranometers of the installed meteorological measurement stations for the test period of 10 consecutive days. Sensors must be cleaned daily.The deviation of the pyranometer sensors shall not exceed 5%• Atotal module area [m2] Total area of PV module• ηSTC module [%] According to PV module datasheet• αtemp Factor This factor will be used to improve the accuracy of PR measurements to compensatethe difference between simulated monthly and real measured module temperature by the sensors of the meteorological station during the 10 days ofthe test period• j [min] Interval of measurements = 15 minThe following formula shall apply for the temperature correction factor: