How much does a solar battery cost installed?
A fully installed home solar battery typically costs $6,000 to $12,000, averaging about $10,000 nationally, with a wider range of $400 for a small standalone unit up to $20,000 or more for a larger system (Angi, HomeAdvisor). Broken down by capacity, the battery itself runs $400 to $750 per kWh before installation (Angi, HomeAdvisor), though HomeGuide’s unit-only pricing runs higher, at $600 to $1,000 per kWh — likely because it captures a different spread of brands and battery chemistries. HomeGuide and This Old House price a complete single-battery installation, rather than blending in bare small-battery costs, and land higher as a result: $8,000 to $16,000 installed before tax credits (HomeGuide), and $10,000 to $19,000 installed (This Old House), with the battery component alone averaging $16,007 based on 2022 NREL data (This Old House). Installation labor adds $2,000 to $3,500 on top of the battery’s price (Angi, HomeAdvisor).
What size solar battery system do you need?
Battery size scales with home size and how much of your house you want backed up. A 5 kWh system, enough for partial backup in a home under 1,000 sq ft, runs $5,300 to $13,000 installed. A 10 kWh system, typical for a 1,000-1,500 sq ft home, runs $9,000 to $20,000. A 15 kWh system for a 1,500-2,000 sq ft home runs $10,000 to $23,000, and a 20+ kWh system for larger homes or more complete backup runs $13,500 to $26,000 (HomeGuide). Whole-house backup usually needs two or more batteries working together, which pushes the installed total to $20,000-$32,000 (HomeGuide) — for systems installed through 2025 the federal credit brought that down to $14,000-$22,400, but that credit no longer applies to a 2026 installation (IRS). By brand, starting equipment costs range from about $6,000 for LG to $12,400 for a Generac PWRcell and $12,000 for SunPower (Angi) — battery chemistry matters too, with lead-acid running $5,000-$15,000, lithium-ion $7,000-$30,000, and lithium-iron-phosphate $9,000-$30,000 for a whole-house system (Angi). Size for where you’re headed, not just today: Barry Cinnamon, a Los Gatos, CA, solar installer and energy podcaster, tells This Old House, “Panel designs change about as quickly as flat-screen TVs,” warning that expanding later often means replacing the inverter and dealing with mismatched components.
Does adding a battery to existing solar cost more than installing both together?
Yes — retrofitting a battery onto solar panels you already have can add 30% to 50% to labor costs compared with installing the battery and panels at the same time (HomeGuide). Installers doing a combined install can plan the wiring, inverter, and panel placement once; adding a battery later usually means working around equipment and wiring that’s already in place, plus potentially upgrading an inverter that wasn’t sized for storage. If your battery doesn’t have a built-in inverter, budget an extra $1,000 to $1,500 for one (Angi, HomeAdvisor). A critical, or backup, load panel — which keeps essential circuits running during an outage — runs $1,000 to $2,000 separately, whether you’re retrofitting or installing new (Angi, HomeAdvisor). If you’re planning both solar panels and a battery from scratch, bundling the work with one installer is generally the cheaper path.
Does the federal tax credit still help with a solar battery in 2026?
No — for a battery placed in service in 2026, the federal credit no longer applies. Angi (updated July 10, 2026), HomeGuide, and This Old House (updated May 25, 2026) all still describe a 30% Residential Clean Energy Credit for purchased or loan-financed solar battery systems, running through 2032 before stepping down to 26% in 2033 and 22% in 2034. But the IRS states directly that the Residential Clean Energy Credit — which explicitly lists “battery storage technology (beginning in 2023)” as qualifying property, alongside solar panels, solar water heaters, and geothermal heat pumps — “is not available for any property placed in service after December 31, 2025” (IRS, guidance last reviewed July 4, 2026). That means the cost-guide figures describing an active credit are stale. For systems installed through the end of 2025, that credit did bring HomeGuide’s $8,000-$16,000 pre-credit installed range for a single battery down to $5,600-$11,200, and its whole-house backup range from $20,000-$32,000 down to $14,000-$22,400 — useful context for what the credit used to be worth, but not something to budget for on a 2026 purchase. Leased systems never qualified either way, since the credit only ever applied to a system you purchased outright or financed with a loan you own (HomeGuide). Check with a tax professional to confirm current eligibility, and ask whether your state layers its own battery-specific incentives on top, since those are separate from the expired federal credit.
Prices vary by region, home size, and equipment brand, so treat the figures above as a planning budget. Get quotes from two or three licensed solar or electrical installers, and confirm whether the quote includes the inverter, critical load panel, and any solar panel work, before committing to a final number.
Sources
Figures synthesized and cross-checked across these sources (retrieved 2026-07-28):
- Angi — Solar battery systems cost between $6,000 and $12,000 on average (normal range), with a national average of $10,000; low end $400, high end $20,000. Per kWh: $400-$750, with average capacity around 10 kWh ($4,000-$7,500 for a typical system before installation). By brand starting cost: EG4 $8,500, Enphase $9,500, Franklin $10,500, Generac $12,400, Growatt $8,200, HomeGrid $9,000, LG $6,000, Panasonic $7,000, SolarEdge $11,500, sonnenCore+ $10,500, SunPower $12,000, Tesla $9,500. Installation labor $2,000-$3,500. By battery type (whole-house system): lead-acid $5,000-$15,000, lithium-ion $7,000-$30,000, lithium-iron-phosphate $9,000-$30,000. Inverter $1,000-$1,500. Critical load panel $1,000-$2,000. Electrical rewiring $6-$10 per square foot. Maintenance $150-$300. As part of the 2022 Inflation Reduction Act, homeowners receive a 30% federal tax credit for installing solar battery systems and solar panels; the credit decreases to 26% in 2033 and 22% in 2034 before expiring in 2035.
- HomeAdvisor — Average cost $10,000 on average; normal range $6,000-$12,000; extended range $400 for small units to over $20,000 for larger systems. Per kWh $400-$750. Installation labor $2,000-$3,500 (as little as $200 for small batteries). Inverters $1,000-$1,500. Backup load panels $1,000-$2,000 per panel. Generac PWRcell starts at $12,400 all-in. Tesla Powerwall costs $9,500. Lead-acid batteries $5,000-$15,000 including installation; lithium-ion batteries priced between $7,000 and $30,000; lithium-iron-phosphate batteries average $9,000-$30,000.
- This Old House — A single battery costs $10,000-$19,000 to install, including almost $19,000 on the high end for the battery plus labor; the battery itself typically costs $16,007 (based on 2022 NREL data). A solar energy system pays off the added cost of a battery in 5-15 years. All solar energy storage systems qualify for the federal solar tax credit, which reduces overall system costs on owed federal taxes by up to 30%. Lithium-ion batteries typically last 10-15 years; lead-acid batteries 3-5 years; nickel-cadmium batteries can last more than 20 years. Page updated 05/25/2026.
- HomeGuide — A solar battery costs $8,000 to $16,000 installed on average before tax credits, or $5,600-$11,200 after tax credits. Unit alone: $6,000-$13,000, or $600-$1,000 per kWh. By home size, installed before tax credit: under 1,000 sq ft / 5 kWh $5,300-$13,000; 1,000-1,500 sq ft / 10 kWh $9,000-$20,000; 1,500-2,000 sq ft / 15 kWh $10,000-$23,000; over 2,000 sq ft / 20 kWh $13,500-$26,000. By brand, unit only: Tesla Powerwall $8,500 (13.5 kWh); Generac PWRcell $10,000-$17,000 (9-18 kWh); LG Chem RESU $6,000-$11,000; Enphase $3,000-$9,500; Sonnen $9,000-$36,000; Panasonic EverVolt $12,000-$13,000; Simpliphi $4,200-$23,500; Eguana Evolve $10,000-$13,000; Electriq Power $9,800-$22,000. Multiple batteries for whole-house backup: $20,000-$32,000 installed, $14,000-$22,400 after credit. Installation labor $2,000-$3,000; retrofitting an existing system can increase labor costs by 30%-50%. Critical load panel $1,000-$2,000. Solar batteries are eligible for the 30% Residential Clean Energy Credit until 2032 (formerly the Solar Investment Tax Credit), decreasing to 26% in 2033 and 22% in 2034.
- IRS — Residential Clean Energy Credit equals 30% of qualified clean energy property costs, explicitly covering 'battery storage technology (beginning in 2023)' along with solar electric panels, solar water heaters, wind turbines, and geothermal heat pumps. States plainly: 'The credit is not available for any property placed in service after December 31, 2025.' Page last reviewed 04-Jul-2026.
Angi and HomeAdvisor (both under the same parent company, with closely aligned data) anchor the headline figures: both cite a $10,000 national average, a 'normal range' of $6,000-$12,000, and an extended range spanning $400 (a single small battery) to over $20,000 (a larger system) — national_average_usd, range_low_usd, and range_high_usd here reflect that cluster. HomeGuide and This Old House report meaningfully higher installed-cost figures because they price a complete single-battery installation rather than blending in bare small-battery pricing: HomeGuide puts one battery installed at $8,000-$16,000 before the federal tax credit (used here as project_low_usd/project_high_usd) and $5,600-$11,200 after the 30% credit, with whole-house multi-battery backup running $20,000-$32,000 ($14,000-$22,400 after credit). This Old House cites $10,000-$19,000 installed for a single battery, with the battery itself averaging $16,007 based on 2022 NREL data. Per-kWh unit pricing also varies: Angi and HomeAdvisor cite $400-$750/kWh for the battery alone (used here as per_kwh_low_usd/per_kwh_high_usd), while HomeGuide's unit-only figure runs higher at $600-$1,000/kWh — likely reflecting different brand/chemistry mixes in each source's sample. The by_type table uses HomeGuide's installed-cost-by-home-size breakdown, the clearest 'popular system tier' data among the four sources. All four cost-guide sources describe a 30% Residential Clean Energy Credit (the expanded credit from the 2022 Inflation Reduction Act, successor to the old Solar Investment Tax Credit) for purchased or loan-financed battery systems, and three of them (Angi, updated Jul 10, 2026; HomeGuide; This Old House, updated 05/25/2026) still describe it as active through 2032 with a step-down to 26% in 2033 and 22% in 2034 before expiring in 2035 — but that is now stale. The IRS, in guidance last reviewed 04-Jul-2026, states the Residential Clean Energy Credit (which explicitly covers 'battery storage technology (beginning in 2023)' alongside solar panels, solar water heaters, and geothermal heat pumps) 'is not available for any property placed in service after December 31, 2025.' So a battery system placed in service in 2026 does not qualify for this credit, regardless of what the cost-guide publishers' evergreen pages still say; the $5,600-$11,200 and $14,000-$22,400 'after credit' figures below reflect what the credit used to save for systems installed by the end of 2025, not what a 2026 buyer can expect to claim. Figures generally include the battery and standard installation labor; solar panels or shingles (if not already installed), inverters, critical load panels, and electrical wiring upgrades are commonly quoted as separate line items.