Solar Panel Efficiency Calculator

Calculate solar panel energy output using official NREL formulas

Panel Wattage (W)(Standard Test Conditions)

Number of Panels

Average Daily Sunlight Hours

Panel Efficiency (%)

Average Temperature (°C)

System Losses (%)(Wiring, inverter, etc.)

Panel Type

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Quick Tips

1Use current environmental data
2Consider seasonal variations
3Document calculation assumptions
4Update calculations periodically