Solar Panel Output Calculator
Fill in the values and the answer updates as you type.
How the Solar Panel Output Calculator works
Daily kWh = array size (kW) × peak sun hours × performance ratio. The performance ratio (usually 75–85%) bundles inverter loss, wiring loss, dust, and panel heating. Monthly values use 30.4 days. Actual output varies with weather and season. Example: with the default values, daily output comes to 16 kWh.
Inputs and results
The Solar Panel Output Calculator takes 4 inputs and gives 4 results.
What you enter
- Number of panels — starts at 10.
- Panel rating (W) — starts at 400.
- Peak sun hours per day (h) — starts at 5.
- Performance ratio (%) — starts at 80.
What you get
- Daily output (kWh)
- Monthly output (kWh)
- Yearly output (kWh)
- Array size (kW)
Example: Solar Panel Output Calculator with the starting values
With number of panels 10, panel rating 400 W, peak sun hours per day 5 h and performance ratio 80 %, the calculator returns:
| Daily output (kWh) | 16 |
|---|---|
| Monthly output (kWh) | 486 |
| Yearly output (kWh) | 5,840 |
| Array size (kW) | 4 |
Change any value above and the results update straight away.
Solar Panel Output Calculator FAQ
How do I use the Solar Panel Output Calculator?
Enter number of panels, panel rating, peak sun hours per day and performance ratio in the fields, then read daily output (kwh), monthly output (kwh), yearly output (kwh) and array size (kw) in the result panel. The answer updates as you type, and you can press Calculate or Enter to refresh it. Use “Copy link” to share your exact numbers with someone else.
What does the Solar Panel Output Calculator calculate?
Daily, monthly, and yearly energy from a set of solar panels. It returns daily output (kwh), monthly output (kwh), yearly output (kwh) and array size (kw) from the 4 values you provide.
What values does the Solar Panel Output Calculator start with?
It opens with number of panels 10, panel rating 400 W, peak sun hours per day 5 h and performance ratio 80 % so you can see a working result straight away. Replace them with your own numbers, or press Reset to return to these starting values.
Is the Solar Panel Output Calculator free and private?
Yes. It is free, needs no account, and runs in your browser, so nothing you type is sent to or stored on our servers. See the Privacy Policy for details.
Can I rely on the Solar Panel Output Calculator for important decisions?
Treat the result as a well-rounded estimate. Real situations often have details a general calculator cannot know, so confirm important decisions with a qualified professional. See the Disclaimer for more.