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solar-test-cell

3 Differences between STC and PTC Ratings You Need to Know

You may have wondered, “Does my 250 watt solar panel actually produce 250 watts?”  Well the answer, technically, is yes. Your panel produces 250 watts, but only under specific conditions.  Solar companies use Standard Test Conditions (STC) to rate their PV products.  The California Energy Commission (CEC), however, rates each product using the Photovoltaic Utility Systems Applications (PVUSA) Test Conditions (PTC) which calculates the wattage...
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