HOW TO USE IT
How to use the Solar Energy Production Calculator
- 1
Set the number of panels and their wattage.
- 2
Enter the equivalent peak sun hours per day.
- 3
Set the system loss and period.
- 4
Review the production in kWh.
THE MATH
Solar production formula
kWh/day = (panels × W ÷ 1000) × hours × (1 − loss)Each panel produces its wattage times the sun hours, corrected for losses (temperature, wiring). Multiply by 30 for the monthly figure.
PRACTICAL EXAMPLE
20 panels of 400 W, 4.5 sun hours, 20% loss
kWh/day = (20 × 400 ÷ 1000) × 4.5 × 0.8 = 28.8 kWh. Monthly ≈ 864 kWh.
FAQ
Frequently asked questions
How much does a solar system produce?
A 400 W panel produces ~1.4 kWh/day in the US depending on sun.
Why the loss factor?
Temperature, wiring and the inverter reduce output by 10-25%.
Are these values guaranteed?
No — these are preliminary estimates, not a production guarantee.