What is the 20 rule for solar panels?
The twenty percent rule for solar panel systems often refers to standard performance derate factors, efficiency rating guidelines, or safety capacity buffers used in photovoltaic design. It helps installers account for typical environmental energy losses—such as inverter inefficiencies, dust accumulation, wiring resistance, and wiring degradation over time—ensuring the solar array adequately meets a building's real-world electrical consumption needs.
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