How to use the solar panel output calculator
Estimate daily energy from a solar array. Enter panel area, efficiency, peak sun hours per day, performance ratio in the fields above; the daily energy, yearly energy are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- A — Panel area (m²)
- eff — Efficiency (%)
- sun — Peak sun hours per day (h)
- pr — Performance ratio
Worked example
With panel area = 20 m², efficiency = 20 %, peak sun hours per day = 5 h, performance ratio = 0.8, the calculator gives daily energy ≈ 16 kWh; yearly energy ≈ 5,840 kWh.
Frequently asked questions
What is the formula for the solar panel output calculation?
Daily energy (kWh) = A × eff / 100 × sun × pr. Yearly energy (kWh) = [Daily energy] × 365. Here A is panel area (m²), eff is efficiency (%), sun is peak sun hours per day (h), pr is performance ratio.
What inputs do I need for the solar panel output calculator?
You need panel area in m², efficiency in %, peak sun hours per day in h, performance ratio. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.