Are Solar Batteries Worth It in 2026? What the Numbers Say

Home batteries have gone from rare to routine in some states, and they are the most common add-on salespeople suggest. They are also expensive, and in 2026 there is no federal credit to soften the price. This guide uses public records to show who is buying batteries, what they paid, and when one pays off.

Who is actually buying batteries

In the public installation records compiled by Lawrence Berkeley National Laboratory (Tracking the Sun), the share of new home solar systems installed with a battery grew quickly and then leveled off:

In 2021–2023, Tesla supplied 64% of the batteries in the records that name the brand, followed by LG (14%) and Enphase (12%). The median battery stored 13.5 kWh, the capacity of a single Powerwall.

The Energy Information Administration’s monthly utility reports (Form EIA-861M) show where batteries paired with home solar are concentrated, as of July 2026:

Hawaii stands out because exporting solar power there earns little, so storing it for the evening is where the value is. The same logic now applies in California under net billing.

What batteries cost

The records include a battery price for 28,980 home systems installed in 2021–2023. The median was about $21,400, roughly $1,070 per kWh of storage, before incentives. Looking at whole systems, solar with a battery had a median price of $40,200, against $27,500 for solar alone. Part of that gap comes from size, since homes adding a battery also installed bigger arrays.

Quotes you get today may differ from these records, which run through 2023. Use them as a reference: if a quote for one 13.5 kWh battery is far above $21,000 installed, ask why.

What a battery does for you

Backup during outages

A grid-tied solar system without a battery shuts down when the grid goes down, so line workers aren’t exposed to power flowing back from your roof. A battery, with the right switch, keeps selected circuits (or the whole house) running and lets the panels recharge it during the day.

Moving solar power to the evening

With time-of-use rates, electricity costs the most in the late afternoon and evening, just as solar output fades. A battery stores midday solar and releases it during those hours.

Getting more from your solar when exports pay little

Under California’s net billing tariff and similar programs, power you send to the grid earns far less than the retail rate. Storing it and using it at home is often worth more than exporting it.

Chemistry and models

Most home batteries now use lithium iron phosphate (LFP) cells, which tolerate heat and many charge cycles well. That includes the Tesla Powerwall 3 (13.5 kWh, up to 11.5 kW continuous, with a built-in solar inverter), Enphase’s IQ batteries and FranklinWH. The older Powerwall 2, still on many homes, used a nickel-manganese-cobalt (NMC) chemistry and delivers about 5 kW.

What to compare between models:

• Usable capacity (kWh): how much energy it stores.
• Continuous power (kW): how much it can run at once. This decides whether it can start your air conditioner.
• Warranty: most cover 10 years with a minimum remaining capacity, often 70%.
• Compatibility: some batteries work only with the same brand of inverter.

Does a battery pay for itself?

Take a time-of-use example: you store 10 kWh of solar a day and use it when grid power costs $0.45 per kWh instead of exporting it for $0.10.

• Daily savings: 10 kWh × ($0.45 − $0.10) = $3.50
• Yearly savings: about $1,280
• Payback at $13,000: about 10 years
• Payback at the $21,400 median in the records: about 17 years

Before 2026, the 30% federal credit took roughly a third off the price. Without it, a battery bought mainly to save money only works where the gap between peak rates and export credits is wide, or where a utility or state program pays you to share the battery. In places with full retail net metering and flat rates, a battery rarely pays for itself; you are buying backup power.

The verdict

• Worth it if outages are frequent or long where you live, or someone at home depends on powered medical equipment.
• Worth pricing out if your utility has steep time-of-use rates or pays little for exported solar, as in California and Hawaii.
• Hard to justify on savings alone if you have full net metering and flat rates.

For what the rest of a solar system costs, see our guide to solar panel prices, and our Tesla Powerwall guide for what installation involves.

Sources

• Lawrence Berkeley National Laboratory, Tracking the Sun, 2024 edition (CC BY 4.0): home systems on existing homes, 2017–2023. Calculations by Solar Power Fix.
• U.S. Energy Information Administration, Form EIA-861M, net metering, July 2026.
• Tesla, Powerwall 3 datasheet.