Solar Energy Output Calculator
Estimate your solar system's true electrical generation capabilities across Daily, Monthly, and Yearly timeframes.
Array Specs
Estimated Yearly Output
Daily Output
16.88 kWh
Monthly Average
513.28 kWh
Estimating Accurate Solar Generation
Predicting exactly how much electricity a solar array will produce over a year requires factoring in the geographic weather reality. A 5kW system in Arizona will produce drastically more power than an identical 5kW system in rainy Seattle.
The Mathematical Formula
Annual solar yield utilizes three multiplicative factors: the size, the sun, and the system loss.
- Formula:
Daily Yield = System Size (kW) × Peak Sun Hours × Performance Ratio - To Get Yearly: Multiply the daily yield outcome by 365.25.
Frequently Asked Questions
What are 'Peak Sun Hours'?
A Peak Sun Hour is not the time from sunrise to sunset. It is defined as one hour in which the intensity of solar irradiance hits exactly 1,000 Watts per square meter. A cloudy winter day lasting 10 hours might only result in 1.5 Peak Sun Hours cumulatively.
What is the Performance Ratio (PR)?
Solar marketing claims assume 100% perfect conditions. In reality, transferring DC power from the roof into useable AC power for your house involves losses. The inverter loses 5%, voltage drops in wiring lose 2%, and dust/dirt blocks another 3%. The Performance Ratio represents the true net power that survives the journey—typically sitting conservatively at 75%.