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Updated by Michael Melocoton on Oct 12, 2020
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How Size your Solar Panels and How to Know the Derating factor of a PV System

In installing a photo voltaic system one should know how to calculate the electricity consumption. Sizing your solar panel is one thing. The derating factor is an issue too. You need to compute how many Wattage or Kilowatts you consume in one day. Take a look at this simple calculation

How Size your Solar Panels and How to Know the Derating factor of a PV System

88% derate for lost due to module heating.  (12% loss)95% for inverter efficiency (5% loss)97% for DC and AC wiring inefficiency (3% loss)95% for module production tolerance and mismatch (5% loss)95% for module power loss due to dust and dirt (5% loss)90% shade factor to account for array shading before 8 a.m and after 4 p.m (10% loss)