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Temperature Loss
Power derating from cell temperature above STC 25 °C.
PerformanceCore inputs only — quick sizing with engineering defaults.
Inputs (SI units)
Negative values are not allowed
Results
Fix input errors to compute results.
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Engineering Formula
- T_cell = T_amb + (NOCT − 20) × G / 800
- ΔT = T_cell − 25
- P_loss% = ΔT × γ_Pmax
Cell temperature rises above ambient in proportion to irradiance. Pmax coefficient (typ. −0.30 to −0.40 %/°C) then determines power derate.
Design Assumptions
- • Free-flow rear ventilation (open rack).
- • Standard NOCT test at 800 W/m², 20 °C, 1 m/s wind.
Engineering Tips
- ◆Elevate roof mounts by ≥ 100 mm for airflow.
- ◆White roofs reduce Tcell by 3–5 °C.
Warnings
- ▲Tcell > 85 °C accelerates PID and encapsulant browning.
Standards & References
IEC 61215 §10.5IEC 61853
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Irradiance → Energy
PV energy produced from measured irradiance.
Peak Sun Hours
Convert daily insolation to Peak Sun Hours.
Monthly Yield Split
Distribute annual generation across months (India typical).