full sun or stc is based on what light intensity in w/m?
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It is about 1367 W/m2. This is attenuated by the atmosphere and the peak solar insolation on a earth's surface oriented normal to the sun on a clear day is of the order of 1000 W/m2. This irradiance of 1000 W/m2 corresponds to Standard Testing Conditions (STC) and is called “peak sun” or “1 sun”.
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STC is an industry wide standard to indicate the performance of PV modules and specifies a cell of temperature 25°C and an irradiance of 100 W/m^2 with an air mass 1.5 .
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