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Blackout Backup Power Calculator

Runs on your deviceCalculatorFree to use
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Work out how long an inverter or UPS battery keeps your Wi-Fi, lights and TV on in a blackout, and what size you need.

Workspace
Preparing your workspace…
Files and inputs stay on your device. Use Reset to clear this workspace.

Useful to know

Why only half a lead-acid battery?

Regularly draining lead-acid or gel batteries below about half shortens their life sharply, so planners count half.

Can my inverter run a fridge?

Often, if it is big enough: a fridge needs two to three times its running power for a moment when it starts.

Where are my files and inputs processed?

This tool processes your entries on your device. It does not upload them or save them in an account. Downloads remain on your device; Reset clears the current tool workspace.

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