Free Tool
Battery Sizing Calculator
Not everyone needs a battery — and those who do don't all need the same size. Enter your details to get a right-sized recommendation.
Daily Usage
20 kWh
Backup Duration
24h
Recommended Storage
23 kWh+
Recommended Options
5x EG4 LL-S 48V
25.6 kWh total · Best value per kWh. Stackable for expansion.
$12,995
View at retailer →2x EG4 PowerPro
28.6 kWh total · Best all-around choice. High capacity per unit reduces complexity.
$8,598
View at retailer →2x Tesla Powerwall 3
27 kWh total · Premium build quality and integrated inverter. Highest cost per kWh.
$19,000
View at retailer →Prices are current retail estimates. Actual pricing may vary. Equipment links are affiliate links — see our disclosure.