Standard Test Conditions (STC) for Solar Panels

Standard Test Conditions (STC) are used to determine the power output of solar panels. Under Standard Test Conditions, solar panels are tested at 25°C (77°F) and exposed to 1,000 watts per square meter (1 kW/m2) of solar irradiance when the air mass is at 1.5. Just like EPA mileage estimates on cars allow you to …

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