Everyone says their photovoltaics products are good, qualified. So we need a standard of testing photovoltaics products.
Air Mass(AM): Distance of what the light passing from surface of atmosphere to the ground. At the same place, distance always changes.
Out of atmosphere ,AM is 0; when the AM equals the thickness of atmosphere, AM is 1. AM1 often appears at equator area, between the Tropic of Cancer and the Tropic of Capricorn. So we set AM1.5 as one condition.
Out of atmosphere ,AM is 0; when the AM equals the thickness of atmosphere, AM is 1. AM1 often appears at equator area, between the Tropic of Cancer and the Tropic of Capricorn. So we set AM1.5 as one condition.
At the top of atmosphere, solar irradiance is 1367W/㎡. When the light arrives ground, solar irradiance is about 1000W/㎡. This is one of conditions.
Temperature is also one of the conditions. Normal temperature is widely used in many areas, so 25℃ is also one condition.
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