Home Battery System GuideEnergySage reports a national average installed cost of about $15,647 before incentives for the roughly 13.5 kilowatt-hours of storage a typical home installs. Expressed per unit of capacity, EnergySage puts the average near $1,159 per kilowatt-hour of stored energy, and per-brand rates range widely. The federal residential clean energy credit that used to cover batteries applies only to systems placed in service through December 31, 2025, so buyers should confirm current rules at the IRS.
Average installed cost
EnergySage tracks quotes from its installer marketplace and reports a national average installed cost of about $15,647 before incentives for a typical 13.5 kilowatt-hour system. This figure represents the whole installed job, not just the battery hardware.
EnergySage notes that costs vary substantially by location, with typical 13.5 kilowatt-hour systems ranging from about $10,274 in Arkansas to about $18,414 in Wyoming. Buyers in different states should expect their local quotes to fall within that spread rather than at a single national number.
Cost per usable kWh
Dividing installed cost by storage capacity gives a per kilowatt-hour rate that is useful when comparing systems of different sizes. EnergySage reports an average near $1,159 per kilowatt-hour of stored energy across its marketplace.
EnergySage's per-brand comparison shows how far this rate moves by manufacturer. It lists Tesla near $967 per kilowatt-hour, FranklinWH near $1,232, Enphase Energy near $1,429, and EcoFlow near $1,365, with MidNite Solar at the low end near $342 per kilowatt-hour. Comparing on a per usable kilowatt-hour basis, rather than sticker price, keeps different capacities on equal footing.
Whole-home and off-grid pricing
The typical single-battery figure covers essential loads during an outage, not the entire house. EnergySage states that homeowners who want whole-home backup pay much more, on the order of $34,000, because that requires more storage and often more power capacity.
EnergySage also notes that covering full off-grid needs runs over $115,000, since an off-grid home has to store enough energy to ride through days without grid support. These figures show why buyers should first define which loads they want to back up before reading a price.
The federal tax credit changed for 2026
The federal residential clean energy credit, section 25D, equals 30 percent of the cost of qualifying property and applies to battery storage with a capacity of at least 3 kilowatt-hours. The IRS states the credit applies to property installed from 2022 through December 31, 2025.
The IRS also states the credit is not available for any property placed in service after December 31, 2025. Because these rules changed for post-2025 systems, buyers should not assume a current percentage applies and should confirm the latest guidance at the IRS or energy.gov before counting a credit into their budget.