The short answer
A 10 kWh home battery costs $12,000-$16,000 installed in 2026 with the 30% federal credit cutting net cost to $8,400-$11,200. Payback ranges 7-15 years depending on net-metering rules, TOU spread, and outage frequency. Most homeowners buy for outage backup, not payback math.
Solar batteries (lithium-ion home storage) cost $10,000-$20,000 installed in 2026 for a typical 10-15 kWh system. The 30% federal tax credit applies to standalone batteries and battery-paired solar. Payback is rarely the right framing — most homeowners buy batteries for outage backup and time-of-use arbitrage, not pure payback. In states with strong net metering (NJ, NY, MA, MD), batteries lose money on energy economics alone. In CA NEM 3.0 territory and TX without net metering, batteries pay back in 7-12 years through TOU shifting and self-consumption.
Battery cost breakdown
Tesla Powerwall 3 (13.5 kWh): $11,500-$15,000 installed. Enphase IQ Battery 5P (5 kWh): $7,000-$9,500. Franklin WH (13.6 kWh): $13,000-$17,000. LG Resu Prime (16 kWh): $14,000-$18,000.
Cost per kWh: $800-$1,400. Larger systems cost less per kWh because soft costs (electrical work, permits, gateway) are mostly fixed. Two batteries instead of one rarely doubles the cost.
The 30% federal Residential Clean Energy Credit applies to standalone batteries 3 kWh+ as of 2023. A $14,000 battery becomes $9,800 net after the credit. Some states stack additional rebates: CA SGIP ($150-$1,000/kWh for high-fire-risk zones), MD residential storage tax credit (30% up to $5,000), NY Energy Storage Incentive.
Three value streams (and which apply to you)
Outage backup: subjective. Worth $200-$2,000+/year depending on outage frequency, food spoilage risk, medical equipment, and home office reliability. Most cost-benefit calculators ignore this entirely.
TOU arbitrage: charge battery on cheap off-peak power (or solar), discharge on peak. Works in CA, NY, MA, and most TX REPs. Spread of $0.15-$0.40/kWh between peak and off-peak. Saves $300-$1,200/year on a 10 kWh system.
Self-consumption (CA NEM 3.0): without full net metering, exporting solar to grid earns ~$0.05/kWh, but consuming it directly avoids ~$0.30/kWh retail. Battery shifts solar production from midday export to evening use, saving the difference.
When to skip the battery entirely
Strong net metering states (NJ, NY, MA, MD, IL): the grid effectively acts as a free, infinite battery — exported kWh credit at retail rate, then drawn back at retail rate when you need them. Adding a physical battery is mostly outage insurance in these states, not an energy savings play. The numbers usually do not support battery payback purely on energy economics.
Flat-rate electricity with no time-of-use option: there is no peak-vs-off-peak spread to arbitrage, so a battery cannot save money on energy timing. The thermostat-settings-to-save-money and how-to-shift-electricity-usage-off-peak guides cover the rate plans where batteries actually pay back.
Whole-home backup versus critical-loads expectations: a 10 kWh battery cannot run a central AC for more than 2 to 3 hours. Most installers wire batteries to a critical-loads sub-panel (fridge, freezer, internet, a handful of lights and outlets). Whole-home backup typically requires 20 to 30 kWh of storage plus a natural gas or propane generator behind it. Many buyers regret paying for a battery and then discovering it cannot run the AC during a heat wave.
Outage frequency too low to matter: if your area averages under 4 hours of outages per year, the marginal value of backup is small. The math typically only works when outage frequency is 12 hours per year or more, or when there is a specific reliability need (medical equipment, home office, food spoilage risk).
Infographic
When a home battery actually pays back — by state
Recap
Bottom line
Home battery storage in 2026 is a more affordable, more capable, and more incentive-rich category than it was three years ago. Net costs after the federal credit start around $8,000 for a small system and reach $14,000 to $18,000 for a typical 13 to 16 kWh install. The economics depend almost entirely on three local factors: net metering rules, time-of-use rate spread, and outage frequency — which is why the same battery can pay back in 7 years in one zip code and never pay back in another.
Before signing any battery quote, pull last year of utility bills to confirm time-of-use enrollment and rate spread, check your state net metering rules against the net-metering-explained-state-rules guide, and calibrate outage expectations against the past five years of utility outage history. If you primarily want backup, the portable-generator-vs-battery-backup-safety guide compares the alternatives. If you want energy arbitrage, the time-of-use-rate-vs-flat-rate breakdown shows whether your local rate plan supports the math.
Want Seenra to run this for your account?
Forever free for households. Commercial accounts get a same-day quote with full commission disclosure. No credit pull, no on-site visit, no service interruption.
Get my fixed-rate quote →Common questions