Backup power sizing tool

Check what you need running during an outage. Everything updates as you go, and nothing you enter leaves your browser.

What do you need running?

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The watts are on the label or charger. For anything with a motor, use the tool's built-in items when you can, since motors need extra power to start.

How long should it last?

Any way to recharge during the outage?

Assumes about 3.5 hours of good sun a day. Winter in the north can be half that.

Budget

Load numbers are typical values unless marked Measured by us. Specs come from manufacturer and retailer pages, checked 2026-10. Runtimes assume about 85% of rated capacity is usable through the inverter.

Pick your essentials above.