Free Solar Panel Output Calculator
Estimate daily energy output from a solar panel array based on panel rating and sun hours.
Estimated Daily Output
16.0 kWh/day
Estimated Daily Output vs Panel Rating
Solar Panel Energy Estimation
Daily energy output depends on panel capacity, sunlight availability, and system losses.
Formula
Daily kWh = Array size (kW) x Peak sun hours x System efficiency
Peak sun hours represent the equivalent hours of full-intensity (1000 W/m^2) sunlight per day, typically 3-6 hours depending on location and season. System efficiency accounts for inverter losses, wiring, temperature derating, dust, and shading.
Example Calculation
10 panels of 400 W each, 5 peak sun hours, 80% system efficiency.
- 01Array size = 400 x 10 = 4000 W = 4.0 kWp
- 02Daily output = 4.0 x 5 x 0.80 = 16.0 kWh/day
- 03Annual output = 16.0 x 365 = 5,840 kWh/year
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