Battery Capacity Calculator

Essentials only

Fridge, lights, outlets, and critical circuits.

Partial home

Essentials plus a wider set of everyday household loads.

Whole home

Broad coverage with higher simultaneous demand.

Critical appliances

Refrigerator

Well pump

Medical equipment

Runtime: 8 hours

Recommended storage

Single home battery

7.4 kWh

Estimated battery capacity needed for 8 hours of essentials-only backup.

Continuous power

1.3 kW

Estimated continuous load for essentials-only coverage.

Peak power

3.6 kW

Headroom for startup spikes from motors and compressors.

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Learn how battery systems work, what they cost, and how they compare with whole-home generator setups.