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Temperature Coefficient Loss Calculator
Solar panels lose efficiency as they heat up. See exactly how much power you lose — and how much a better panel would gain.
Panel & Climate
Results
Enter your specs to estimate temperature loss
Why Heat Hurts Solar Panels
Solar cells are semiconductors. As temperature rises, the bandgap narrows and open-circuit voltage drops — cutting power output. Standard test conditions (STC) are at 25°C cell temperature, but real cells often run 25-40°C hotter than ambient air.
25°C
STC reference — panel produces rated wattage
45°C
Typical summer cell temp — 7% loss on standard panel
65°C
Rooftop on hot day — 14% loss on standard panel