PV Max Ambient Temperature for a Target Power
The inverse of the PV cell-temperature tile: the highest ambient temperature a module still makes a target power, since a negative power coefficient means a hotter cell makes less. T_cell = 25 + (P/P_stc - 1) x 100/gamma, then T_amb = T_cell - (NOCT-20) x G/800. A 400 W module holding 358 W at 800 W/m^2 tops out at 30 C air (55 C cell). Answers 'how hot before it drops below target' instead of the power from a set air temp. Temperature derate only; the datasheet governs.
Formula and source
T_cell = 25 + (target_power/P_stc - 1) x 100/gamma; max_ambient = T_cell - (NOCT - 20) x G/800. The inverse of P = P_stc x (1 + gamma/100 x (T_cell - 25)) and T_cell = T_amb + (NOCT - 20) x G/800.
The PV NOCT cell-temperature model and the datasheet power temperature coefficient, by name, solved for the ambient temperature.
Audience
This tile is built for trades and the adjacent professions in the Electrical group. The interactive calculator runs entirely in your browser. No account, no fee, no advertising, no tracking.
Related tools
Posture
Rough Logic answers the math question the working professional asks on the job. The site is a calm, fast, ad-free, account-free, ever-free reference. It does not interpret code. It does not replace the licensed professional. It does not store your inputs. The Authority Having Jurisdiction governs all installations and inspections.