Home Battery Backup Calculator

How Much Battery Backup Do You Need?

Pick the things you want to keep running during a power outage and how long you want them to last. We’ll size the battery and give you a cost range and product category to start with.

Quick start: pick a typical loadout Or skip this and pick items individually below.

What do you want to keep running?

Refrigerator and freezerAbout 1.5 kWh per day LED lights (a few rooms)About 0.4 kWh per day Internet, router, and phone chargersAbout 0.5 kWh per day Medical equipment (CPAP, oxygen)About 1.5 kWh per day Well pump or sump pumpAbout 1.5 kWh per day Central air conditioningHeavy load. About 30 kWh per day if running constantly

Window air conditioner unitsEach unit uses about 8 kWh per day if running constantly

units

Need more precision? Add specific appliances Pick from common US household items. Watts and surge multiplier auto-fill from typical values; you can edit anything before it lands in your total.

How long do you want backup to last?

4 hours 8 hours 24 hours 72 hours

Battery capacity needed

0 kWh

includes safety buffer

Estimated cost range

$0

installed

Home Battery Backup Calculator

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