Solar · Photovoltaics (PV)
Standard Test Conditions (STC)
The lab benchmark used to rate panels: 1,000 W/m² irradiance, 25°C cell temperature, and an air mass of 1.5. Nameplate wattage is measured at STC, so real-world output is usually lower.
Common uses
Apples-to-apples panel rating; interpreting nameplate watts
Related terms
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