Solar Panel Output Calculator
Estimate the daily energy output of a solar array from panel area, efficiency, peak sun hours and a real-world performance ratio.
- Monthly output (30 days)
- 225.0 kWh
Formula: E = Area × Efficiency × Sun hours × PR
About Solar Panel Output Calculator
Solar Panel Output Calculator is a free online calculator that gives you an instant, accurate result as you type. Estimate the daily energy output of a solar array from panel area, efficiency, peak sun hours and a real-world performance ratio.
The calculation uses the standard formula E = Area × Efficiency × Sun hours × PR and updates live with every change to the inputs. Everything runs client-side in your browser — fast, private, and free to use as often as you like.
Peak sun hours measure daily solar energy per square meter: desert regions get 5-7 hours while northern Europe averages 2-3.
Frequently Asked Questions
Is Solar Panel Output Calculator free to use?
Yes. Solar Panel Output Calculator is completely free, with no sign-up, no downloads, and no usage limits. You can use it as many times as you like on any device with a web browser.
How accurate is this calculator?
The calculator applies the standard formula (E = Area × Efficiency × Sun hours × PR) with full floating-point precision and rounds only the displayed result. For most practical purposes the results are exact.
What is the performance ratio?
It accounts for real-world losses from inverters, wiring, dust and heat. Typical systems achieve 0.7-0.85; 0.75 is a safe default.
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