What a Home Battery Costs per kWh, and What One Day Off-Grid Takes
Quotes on EnergySage in the first half of 2026 averaged $15,647 for 13.5 kWh of home battery storage before incentives, about $1,159 per kWh installed. By our math, storing one day of an average US home's electricity takes about $34,000 in batteries, before any solar panels.
The packs themselves are far cheaper. BloombergNEF reported that stationary storage battery packs averaged $70 per kWh worldwide in 2025, 45% lower than in 2024, and all battery packs averaged $108 per kWh. These are global averages for packs only, not the price of an installed home system.
The average US residential customer bought 10,791 kWh of electricity in 2022, according to EIA, or about 30 kWh a day. At about $1,159 per kWh, one day of storage takes about two of those 13.5 kWh batteries, about $34,000. A what-if of three cloudy days comes to about $103,000. These figures are batteries only, with no panels.
Spread over 15 years at one cycle a day, the assumptions in NREL's Annual Technology Baseline 2025, a battery costs about 21 cents per kWh stored, hardware only, before losses and panels. US homes paid 18.19 cents per kWh from January to July 2026, a preliminary EIA figure. The 30% federal tax credit that covered home batteries ended after 2025. One day of batteries equals about 17 years of the average yearly bill of about $1,963, which applies the 2026 price to 2022 use.
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Sources
- BloombergNEF, Lithium-Ion Battery Price Survey, December 2025
- EnergySage, energy storage cost data, July 2026
- EIA, average residential electricity use, 2022
- EIA, Electric Power Monthly, Table 5.6.B, September 2026
- NREL, Annual Technology Baseline 2025, residential battery storage
- IRS, Residential Clean Energy Credit