# Photovoltaics - Temperature Coefficient and Power

Calculator for the temperature coefficient in photovoltaics, how the power changes with the temperature. The specification of the nominal power of photovoltaic modules applies at a module temperature of 25 degrees Celsius. At a higher temperature, the power decreases, at a lower temperature it increases. On a hot summer day, the temperature of the module can be 70 degrees Celsius. The exact temperature coefficient can be found in the manufacturer's information; an approximate guide value is -0.4 percent. This means that for every degree warmer than 25 degrees Celsius, the performance drops by 0.4 percent.

The effective power indicates which power can ideally be achieved at the corresponding temperature. The temperature or the effective power can be calculated from the other three values.

Example: at a temperature on the photovoltaic modules of 60 °C and the set temperature coefficient, the effective power is 86 percent.

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