How Much Does Solar Battery Storage Cost?

By the HomePriceFacts Research Team · Last updated: November 13, 2026 · Prices checked against published 2026 solar battery cost data

A solar battery costs about $15,647 installed in 2026 for the typical 13.5 kWh system — and that number is roughly $4,500 higher than the same system effectively cost a year ago, because the 30% federal tax credit that used to cover it ended on December 31, 2025. The battery itself has not got more expensive; the subsidy disappeared. This guide prices batteries the way the market actually prices them — per kilowatt-hour, by brand, and by state — explains why the cheapest battery cells in history still produce a $15,000 installed system, and works through the payback math honestly, including the states where a battery pays for itself and the states where it does not.

Start with the unit, because it is the only way to compare batteries honestly. Batteries come in different sizes — 5 kWh, 10 kWh, 13.5 kWh, 15 kWh — so comparing total prices is comparing different products. The market's own unit is dollars per kilowatt-hour of storage ($/kWh), and EnergySage's marketplace data for the first half of 2026 puts the typical US home battery at $1,159 per kWh installed, with a median of $1,130 per kWh. That is the number to carry into every quote comparison: divide the installed total by the usable capacity, and you can compare a Tesla against an Enphase against a Canadian Solar on the same basis. The typical system size is 13.5 kWh — the size of a Tesla Powerwall 3, and the size EnergySage uses as its benchmark — which is why $1,159 per kWh and $15,647 for the system are the same fact expressed two ways.

The second thing to know is why the installed price is so much higher than the battery itself. The lithium-ion cells inside a home battery have never been cheaper: BloombergNEF priced stationary-storage battery packs at $70 per kWh in 2025, down 45% in a year. Yet a homeowner pays $1,100 to $1,400 per installed kWh. The gap — roughly $1,000 per kWh — is not a mark of industry gouging; it is the inverter, the electrical work, the critical load panel, the permits, the installer labour and the warranty, which together make up 40–60% of the total on EnergySage's figures. The equipment itself accounts for 50–60% of the price of an energy storage system, and labour and project planning make up most of the rest. That is also why battery prices have not followed cell prices down: the cells are a minority share of what you are buying.

What the price normally includes

• Battery unit(s) — equipment is 50–60% of the total (EnergySage); a single battery's equipment runs $8,500–$12,000 (IntegrateSun, single source)
• Inverter — built into the Tesla Powerwall 3; a separate inverter "could add a couple of thousand dollars" (EnergySage)
• Installation labour and electrical work — $3,000–$5,000 including permits for a single battery (IntegrateSun, single source)
• Critical load panel — the panel itself is not costly, but the electrical work to install one can add up (EnergySage); some smart panels make a separate critical load panel unnecessary
• Permits and inspection — part of the installation line above
• NOT usually included: a main panel upgrade, the solar panels themselves, or ongoing software subscriptions — and, since 2026, no federal tax credit to subtract

Solar battery cost by brand

All figures are EnergySage marketplace quotes for the first half of 2026, averaged per kWh across the ten most-quoted brands, before incentives. Three things in this table deserve a warning. First, the spread is enormous — $342 to $1,648 per kWh, and Fortress Power sits above the table entirely at about $3,505 per kWh — because brands differ in chemistry, warranty, software and whether the inverter is built in. Second, MidNite Solar's $342 per kWh is an outlier inside EnergySage's own table: it is published, so it is shown, but do not budget a whole-home install on it — it reflects a different product and quote mix than the mainstream brands. Third, the Tesla figure needs its companion number: installer-published installed prices for a Powerwall 3 run $15,300–$16,200, against EnergySage's $13,055 quote average, because marketplace quotes and fully installed totals are different scopes. The Powerwall 3 is still roughly 10% below the marketplace average per kWh, which is why it is the benchmark — and its built-in 11.5 kW solar inverter saves $2,000–$3,000 on a new solar-plus-storage install, on IntegrateSun's figures, because no separate inverter has to be bought. Enphase's IQ Battery 10C runs about $13,000 installed per unit and FranklinWH's aPower 2 $14,000–$17,000, both on IntegrateSun's figures. All major residential batteries in 2026 use LFP (lithium-iron phosphate) chemistry, which is safer, longer-lasting and allows 100% depth of discharge, against the older NMC chemistry.

Cost by system size

Size is the second decision after brand, and it is the one most buyers get wrong. Batteries are far less customisable than solar panels: adding or removing a single panel is easy, but battery capacity comes in fixed blocks, and some brands only stack in whole units. A 5 kWh battery backs up a few critical loads — fridge, lights, Wi-Fi, a medical device — for a few hours. The typical 13.5 kWh system keeps essential devices running through an overnight outage. Whole-home backup, at around $34,000, means multiple batteries and a critical load panel covering the whole house. Going fully off-grid costs over $115,000 on EnergySage's figures, because it needs enough storage for days without sun, not hours. The honest sizing question is not "how big a battery can I afford" but "which circuits must stay on in an outage, and for how long" — size to the essential loads, and the price follows.

Cost by state

All figures are EnergySage marketplace data for the first half of 2026, before incentives. Battery prices vary from state to state for reasons that have little to do with the battery: installers may be less familiar with batteries in some states and charge more for labour, permitting can be slower, or the brands carried locally may be the expensive ones. Alabama is the cheapest state in the table at $563 per kWh, Louisiana the most expensive at $1,586 — a nearly threefold spread for the same product. California, the largest battery market in the country, sits near the national average at $1,079 per kWh, or $14,567 for 13.5 kWh. EnergySage's own local data for November 2026 puts California slightly lower, at about $1,037 per kWh, or roughly $13,482 for a 13 kWh system. Three states — North Dakota, Nebraska and South Dakota — are excluded from this table because their median quoted system is 40.5 kWh, which is a multi-battery install, not a comparable single-battery price. Our California solar guide covers the state's NEM 3.0 export rules that make batteries more valuable there than in states where net metering still pays near-retail for exports.

What drives the price up or down

Battery size and capacity

Capacity is the first driver: more kilowatt-hours means more money, roughly linearly at $700–$1,300 per kWh. But the relationship is not perfectly linear, because larger systems spread the fixed costs — inverter, critical load panel, permits, labour — across more capacity. Two 10 kWh batteries cost less per kWh than one 5 kWh battery for the same reason. The trap is buying capacity you never use: a battery that cycles only a few kilowatt-hours a day is an expensive ornament, however cheap per kWh it was.

Brand and chemistry

Brand is the second driver, and the table above shows how wide it runs: $342 to $1,648 per kWh across EnergySage's ten most-quoted brands. The differences are chemistry, warranty length, cycle life, software and whether the inverter is included. All major residential batteries in 2026 use LFP chemistry — safer, longer-lasting and capable of 100% depth of discharge — against the older NMC cells. Warranty terms matter as much as price: Tesla's 10-year warranty guarantees 70% capacity retention, and other brands offer 10–15 years with different cycle limits.

The inverter

Batteries store direct current, but appliances use alternating current, so an inverter has to sit between them. Some batteries come with a hybrid inverter that also works with solar, or a storage-specific inverter; if yours does not, you need to buy one separately, and EnergySage says it "could add a couple of thousand dollars" to the system cost. The Tesla Powerwall 3 has a built-in 11.5 kW solar inverter, which is a real cost advantage on new solar-plus-storage installs — it eliminates a separate inverter purchase worth $2,000–$3,000 on IntegrateSun's figures — but no advantage at all on a retrofit to panels that already have their own inverter.

New install vs retrofit

Installing storage at the same time as a solar panel system saves money, because the electrical work is done once. Retrofitting a battery to existing solar costs extra for labour, wiring and in some cases equipment, on EnergySage's figures. One comparison puts a Powerwall 3 at $13,000–$17,000 as a retrofit against $12,000–$16,000 with a new solar install — a roughly $1,000 difference — but that is a single source, so treat it as indicative rather than a published premium. Budget a retrofit at the top of the $700–$1,300 per kWh band.

Electrical panel and critical loads

Most home battery systems are not large enough to cover all of a home's electricity use, so specific circuits have to be moved onto a critical load panel — a secondary panel carrying only the circuits that must stay energised in an outage. The panel itself is not costly, but the electrical work to install one can add up, and some battery companies now offer load-management devices that make a separate critical load panel unnecessary. A smart electrical panel can serve the same purpose. If your main panel also needs an upgrade, that is a separate cost on top — our EV charger guide prices panel upgrades in the same range.

State and installer market

Where you live changes the price by thousands: Alabama at $563 per kWh against Louisiana at $1,586 per kWh is the same product at nearly three times the price. The drivers are installer familiarity, permitting speed, local labour rates and which brands are carried locally. EnergySage's own claim is that homeowners who use its quote-comparison platform typically pay 20% less than the market average — that is EnergySage's claim about its own service, not an independent finding, but the underlying advice is sound: get multiple quotes, because the spread between installers in the same state is routinely 20% or more.

Incentives — what is left after the federal credit ended

State and utility incentives are now the difference between a battery being a smart investment and an expensive luxury. California's Self-Generation Incentive Program stacks up to over $1,000 per kWh for eligible installs on EnergySage's figures — though eligibility requirements apply, and an earlier SolarReviews figure of $150 per kWh shows how much the rebate varies by tier, so treat SGIP as tier-dependent rather than a single number. Connecticut's Energy Storage Solutions programme offers up to $16,000, and utilities like Eversource and National Grid offer ConnectedSolutions payments that EnergySage says can cover a battery's entire cost within five years. If you live somewhere without state incentives, you are paying the full $15,647 out of pocket, and the payback math below is the number that matters.

The federal credit ended — what that actually costs you

The Section 25D Residential Clean Energy Credit gave a 30% uncapped federal tax credit for qualifying residential battery storage systems of at least 3 kWh, installed in a primary or secondary home. It was terminated for systems placed in service after December 31, 2025, by the One Big Beautiful Bill Act (Public Law 119-21), signed July 4, 2025. For a $15,000 Powerwall installation, that eliminates $4,500 in federal tax savings that would have applied to a 2025 installation. The same law ended the 30% credit for solar panels, which is why our solar panel guide and our California solar guide both carry the same warning. Note that a leased system or a power-purchase agreement is different: the leasing company can still claim a version of the credit and may pass the savings on — but for a homeowner buying a battery outright in 2026, the federal credit is zero. Any quote, product page or installer pitch that still subtracts 30% is using stale figures.

Is a battery worth it? The payback math

EnergySage's answer is that a battery is worth it if you live somewhere with frequent blackouts, your utility pays little or nothing for exported solar power, or you have access to strong state incentives — and that adding batteries can double your solar costs, so it is not a smart investment for every homeowner. The arithmetic behind that judgement is stark at average US electricity prices. Jouleio's calculation, a single source, runs like this: at the EIA's June 2026 national average residential rate of 18.16 cents per kWh, one full 13.5 kWh cycle a day is worth at most $895 a year, which puts simple payback at 10.6 to 19.6 years against the $9,450–$17,550 installed range. In Hawaii, at 47.18 cents per kWh, the same daily cycle is worth $2,325 a year and payback drops to 4.1 to 7.5 years. Two caveats: the calculation assumes a full cycle every single day, which most homes do not achieve, and it values the battery only as a bill-saving device — it puts no price on keeping the lights on during an outage, which is the reason most buyers actually purchase one. A battery bought for resilience is a different purchase from a battery bought for savings, and it should be judged on different terms. The other comparison worth making is the generator: a whole-house standby generator costs $6,000–$11,000 installed, far less than a battery, but it burns fuel, needs maintenance and cannot store your own solar power for the evening.

Ways to keep the cost down

• Size to your essential loads, not your whole home — a 13.5 kWh battery covering the fridge, lights and Wi-Fi costs half what whole-home backup costs.
• Install the battery with new solar panels, not as a retrofit — the electrical work is done once, and the Powerwall 3's built-in inverter saves $2,000–$3,000 on a new install.
• Compare brands on dollars per kWh, not total price — a $6,540 Canadian Solar 10 kWh and a $14,290 Enphase 10 kWh are the same capacity at very different prices.
• Check state and utility incentives before you sign — SGIP in California, Energy Storage Solutions in Connecticut, and the DSIRE database for your state can change the answer by thousands.
• Get multiple quotes and compare them on the same scope — EnergySage's own claim is that its users typically pay 20% less than the market average, and the spread between installers in one state is routinely that wide.
• Do not buy a battery only because you have solar panels — if your utility still pays near-retail for exports and your power rarely goes out, the battery is a resilience purchase, not a savings one, and should be judged as such.

Frequently asked questions

Related cost guides

Sources: EnergySage, "Solar Battery Cost: Are They Actually Worth It In 2026?" (updated July 13, 2026; typical 13.5 kWh $15,647 before incentives; brand $/kWh table H1 2026 — Tesla $967 / 13.5 kWh / $13,055, Enphase $1,429 / 10 kWh / $14,290, FranklinWH $1,232 / 15 kWh / $18,480, EG4 $1,149 / 12.9 kWh / $14,822, EcoFlow $1,365 / 9.5 kWh / $12,968, Sigenergy $1,028 / 15.4 kWh / $15,831, APsystems $1,648 / 10.2 kWh / $16,810, MidNite Solar $342 / 16 kWh / $5,472, Fox ESS $782 / 14.3 kWh / $11,183, Canadian Solar $654 / 10 kWh / $6,540; Fortress Power ~$3,505/kWh; average $1,159/kWh; median $1,130/kWh (H1 2026 Home Electrification Marketplace Report, via podcast); state table — CA $1,079 / 13.5 kWh / $14,567, TX $1,059 / $14,297, FL $1,005 / $13,568, NY $888 / $11,988, AL $563 / $7,601, TN $720 / $9,720, HI $789 / 17.5 kWh / $13,808, MA $1,352 / $18,252, LA $1,586 / 9.5 kWh / $15,067; whole-home backup ~$34,000; off-grid $115,000+; equipment 50–60% of total; SGIP "up to over $1,000 per kWh" (eligibility requirements); Connecticut Energy Storage Solutions up to $16,000; retrofit costs extra labour, wiring and equipment; separate inverter "a couple of thousand dollars". EnergySage's claim that its users "typically pay 20% less than the market average" is labelled on-page as EnergySage's claim); jouleio, "Home Battery Cost per kWh: 2026 Price Comparison" (September 17, 2026) and "Solar Battery Storage Cost 2026" (EnergySage marketplace $700–$1,300/kWh installed; 13.5 kWh $9,450–$17,550; Powerwall 3 ~$1,018/kWh, installed $15,300–$16,200; single battery 10–14 kWh $8,000–$18,000; industry $800–$1,400/kWh; EIA June 2026 US average 18.16¢/kWh, Hawaii 47.18¢/kWh; payback arithmetic — 13.5 kWh cycle/day worth at most $895/year at the US average, 10.6–19.6 years; Hawaii $2,325/year, 4.1–7.5 years — jouleio's arithmetic, single source, labelled; 25D ended December 31, 2025, P.L. 119-21; $15,000 install lost $4,500 in federal savings); IntegrateSun, "The Complete Home Battery & Solar Storage Guide (2026)" (single battery 10–13.5 kWh $10,000–$16,000 installed; equipment $8,500–$12,000, install/electrical/permits $3,000–$5,000; Powerwall 3 $15,300–$16,200, ~$1,140/kWh; Enphase IQ Battery 10C ~$13,000; FranklinWH aPower 2 $14,000–$17,000; Powerwall 3 built-in inverter saves $2,000–$3,000 on new solar-plus-storage installs; expansion packs $5,900 each); solarpricelist, "Best Home Battery Storage 2026" (October 2026; Powerwall 3 $13,000–$17,000 retrofit vs $12,000–$16,000 new solar install — single source, labelled). NOT used: mbg.paketusahaku.net figures (a units error and a content-farm domain); BloombergNEF's $70/kWh pack price (cell cost, not an installed system — used only as labelled context); EnergySage's ND/NE/SD state rows (40.5 kWh median = multi-battery installs — excluded, noted on-page). Full source list and methodology: How we research. Spotted a price that looks wrong in your area? Tell us — we re-check reader-flagged figures first.