Interactive tool
Battery Size Calculator
Estimate the battery capacity you need for outage backup and compare matching home battery reviews.
Part of a bigger guide
See the full backup-power guide
Use this calculator after you understand whether a battery is the right category for your outage goals compared with a generator or a portable power station.
Open the backup hubRecommended battery capacity
18 kWhMatching reviews
Tesla Powerwall 3 - $9,000-$14,000 installed
Enphase IQ Battery 5P - $6,500-$9,500 installed
Generac PWRcell - $10,000-$15,000 installed
FranklinWH aPower - $11,000-$16,000 installed