Free backup power calculator

Find the power station that keeps your house running.

Pick what you need to keep on: the fridge, a CPAP, the furnace blower, Wi-Fi. We'll show how long each power station lasts and which one fits.

Calculate my backup power See our top picks

Quick start:Phones, Wi-Fi and lights Keep the fridge cold CPAP through the night Winter outage, gas heat Most of the house

A snow-covered Cape Cod house at dusk with warm light in every window

Top picks for this winter

Best overall

EcoFlow DELTA 3 Plus

1,024 Wh
1,800 W out
27.6 lb

The most flexible 1 kWh unit: strong 1,800 W output and the option to add batteries later.

Check price at EcoFlow Specs and runtimes

Best 2 kWh

Jackery Explorer 2000 v2

2,042 Wh
2,200 W out
39.5 lb

Two kilowatt-hours at under 40 lb. Enough to keep a typical fridge running for about a day on its own.

Check price at Jackery Specs and runtimes

Whole-home

EcoFlow DELTA Pro 3

4,096 Wh
4,000 W out
113.5 lb

Home-backup class. 120/240 V output can run a well pump or central-system loads, and it rolls on wheels.

Check price at EcoFlow Specs and runtimes

Answers people search for before a storm

Will a power station run my fridge?

Yes, and here's how long, model by model.

What's the best power station for a CPAP?

Nights of runtime with and without the humidifier.

How much emergency food do I need?

Calculate it by calories, not "servings."

The $19 Outage Planner

Everything you need on paper when the power's out

A printable planner with your appliance load list, a power-station runtime worksheet, a fridge and freezer food log, emergency contacts and a storm-day checklist.

See what's inside