Find the battery capacity (Ah) and inverter size (VA) to run your fans, lights and TV through a power cut.
loading toolHow to use the inverter and battery calculator
- Type your numbers in the boxes (pick your currency or units if asked).
- The answer updates as you type: no button to press.
- Copy the result, or share it on WhatsApp with one tap.
Questions
Why is a lithium battery smaller?
Lithium batteries can safely use about 90% of their capacity; lead-acid ones only about 50%.
Is my data private?
Yes. Everything happens inside your own browser: nothing you type or choose is uploaded to us or anyone else.
Is it free?
Completely free, with no sign-up, no watermark and no limit on how many times you use it. Light ads keep the site running.
