Keep the house running when the grid doesn't.

Six quick questions, and we'll tell you what size of backup covers the things you can't do without.

Runtimes calculated from manufacturer specs, with our assumptions shown next to every number.
Every pick shows its trade-offs, not just its strengths.
Not sponsored. We earn affiliate commissions, and they never change our picks. How

Start with what you need to keep on

Kitchen

How big a battery has to be, with the math shown.

Medical devices

Nights of runtime, and the humidifier setting that matters most.

Basement

Why pumps are harder to back up than they look.

Getting started

Power banks to wired-in batteries, and which one matches your outage.

What each spec means, and the numbers to look for.

Pick your appliances. We start with typical numbers, so no watts needed.