PV Cell Temperature and Temperature-Derated Power
Cell temperature from the NOCT model T_cell = T_amb + (NOCT-20) G/800 and the temperature-derated power P = P_stc(1 + gamma(T_cell-25)). A 400 W module at 30 C air, 800 W/m^2 runs 55 C and makes 358 W (10.5% loss); a cool 10 C morning makes 386 W. The datasheet governs.
Formula and source
T_cell = T_amb + (NOCT - 20) x G/800; P = P_stc x (1 + (gamma/100)(T_cell - 25)); loss = (1 - P/P_stc) x 100.
The PV NOCT cell-temperature model and the datasheet power temperature coefficient, by name.
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