Is there a function which defines the FF of PV module with respect to Irradiance and temperature?

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Steve M Sefchick

Sure. The expression is (Impp * Vmpp) / (Isc*Voc)

Saeed Ahmed

Fill factor = Power at Maximum Power point / Isc × Voc

These all the factors will change with the change in Temperature and Irradiance.

As Irradiance is directly proportional to the Current.

In the case of Temperature with the increase in Temperature Voltage is decreased.