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Solar panel calculator
Panels, battery and inverter needed to cover your electricity use.
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About Solar panel calculator
Estimates the number of solar panels, battery capacity and inverter size needed for your daily electricity use. Panels needed equal daily kWh divided by panel watts times peak sun hours, plus system losses of around 20 percent. Peak sun hours vary by location, often 4 to 6.
How to use Solar panel calculator
- Enter your daily electricity use in kWh.
- Enter the panel wattage and the sun hours at your location.
- Read the panels, battery and inverter size.
Why use this tool?
- Private: everything happens in your browser. Nothing you enter is uploaded.
- Free, with no sign-up, no watermark and no limit on how often you use it.
- Works on phones, tablets and computers: Android, iPhone, Windows, Mac and Linux. Nothing to install.
- Free to embed on your own website, with a ready-made code to copy.
- Available in 10 languages.
Also known as
Frequently asked questions
How many solar panels do I need for 20 kWh a day?
With 5 sun hours and 400 W panels, about 10 to 12 panels once losses are included.
What are peak sun hours?
They are the hours per day with the equivalent of full sunshine, not daylight hours. Look up the value for your location.
Does the estimate include losses?
Real systems lose energy to heat, wiring and the inverter, and results are estimates. Ask an installer to check the design.
Is Solar panel calculator free?
Yes. Solar panel calculator on Toolipedia is free to use, with no sign-up and no watermark.
Is it safe to use?
Yes. Everything is worked out in your browser, and nothing you enter is sent to our server.
Does it work on my phone?
Yes. It works in any modern browser on Android and iPhone, as well as on tablets and computers. There's nothing to install.
Do I need an account?
No. Just open the page and use the tool. There's no sign-up and no email needed.
Can I put Solar panel calculator on my own website?
Yes. Use the Embed on your site button under the tool to copy a short piece of code and paste it into your page. It is free, needs no account, and the tool keeps working inside your page.