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.

Share this estimate

Share your current calculator configuration.

Get Started

Home Backup Design Tuned to Your Region

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