Solar Panel Output Calculator
By Santaji GadepatilinUpdated October 27, 2026
kWp
hours
kWh
calculatedkWh
calculatedkWh
calculated4,106 kWhType in any field to change it. Press × on a value to calculate that field instead.
How to use this calculator
Enter the system size in kWp, your location’s peak sun hours and a performance ratio. Daily, monthly and yearly energy are estimated.
Formula
kWh/day = kWp × peak sun hours × performance ratio
Example
A 3 kWp system with 5 peak sun hours at 75%:
- 11.3 kWh/day
- 338 kWh/month
- 4,106 kWh/year
Frequently asked questions
How much energy does a 1 kW solar system produce?
About 3–5 kWh per day in many places — roughly 1,100–1,800 kWh per year depending on location.
What are peak sun hours?
The equivalent hours of full 1,000 W/m² sunshine per day. Northern Europe has about 2–3; India, Australia and the US Southwest often 5–6.
What reduces output?
Heat, dust, shading, wiring and inverter losses. A performance ratio of 75–85% is typical.