Solar Temperature Loss Calculator — Estimate PV Output at Higher Temperatures
Estimate how module operating temperature changes PV power relative to a selected reference condition using the panel's power temperature coefficient.
Temperature-loss inputs
How solar temperature loss is modeled
Photovoltaic module power is commonly evaluated relative to a reference temperature. This calculator uses the entered temperature coefficient to estimate the percentage change from the reference condition.
Why module temperature is not the same as outdoor air temperature
A PV module can operate substantially above ambient air temperature under sunlight. For planning, use an actual module-temperature estimate or measured temperature basis rather than automatically substituting outdoor temperature.
Why the annual loss depends on energy exposure
A temperature-related power difference only affects the energy produced while the system is operating under those conditions. The annual exposure-energy input lets you isolate that portion of production.
Worked example
With a 10 kW array, a 25°C reference and a 55°C operating module temperature, the temperature difference is 30°C. At a 0.35%/°C coefficient, the simple adjustment is approximately 10.5% below the reference power during the modeled exposure period.
Frequently asked questions
Does a higher temperature always reduce PV output?
Under the user-entered negative-power-response model, hotter module temperatures reduce modeled output. The exact relationship depends on the module technology and operating condition.
Should ambient temperature be entered?
Use module temperature when the calculator is intended to model module power. Ambient temperature is not automatically equivalent to module temperature.
Can the result be above the reference output?
Yes, mathematically, if the operating temperature is below the reference condition.