Home battery installation cost: where the money goes

Two quotes for the same battery can differ by thousands of dollars, and the battery is almost never the reason. This guide is about the rest of the invoice: which categories the money splits into, what the federal labs actually publish about those categories, how stale that evidence is, and which lines your own decisions move.

Our installation process guide covers what happens and when. This one covers where the money goes. We read every source cited here on August 19, 2026, and we have not installed anything ourselves.

One naming note before the citations, because it will confuse anyone checking our work. The National Renewable Energy Laboratory is now the National Laboratory of the Rockies, and nrel.gov no longer resolves. Its documents live at nlr.gov and docs.nlr.gov, and older reports still carry NREL report numbers. We cite each document by the title and number it was published under.

The categories the money actually splits into

The federal cost model does not have a line called "the battery." It has eight, and the published category names are worth learning because they map onto how an installer builds a bid.

From the Q1-2025 Solar Photovoltaic System Cost Benchmarks description document, a joint Department of Energy, Lawrence Berkeley National Laboratory, National Laboratory of the Rockies, and Sandia product (report number NLR/OT-7A40-97930):

1. Module

2. Inverter

3. Energy Storage System (ESS)

4. Structural Balance of System (SBOS)

5. Electrical Balance of System (EBOS)

6. Fieldwork, "the cost to the installer of work performed at the installation site"

7. Office work, "the cost to the installer of work performed off-site"

8. Other, "costs and overhead incurred by the project developer not included elsewhere"

The document then makes the split that matters: "The first five categories are referred to as the hardware cost and the last three categories are referred to as the soft cost."

Every argument about home battery pricing is really an argument about categories six through eight.

What the published benchmarks say, and for which year

The current benchmark, for Q1 2025, reported in 2024 dollars, gives residential figures for two configurations. It defines the storage case precisely: "The ESS is a lithium-ion battery cabinet having an energy storage capacity of 13.5 kWh. The ESS cabinet includes a bidirectional inverter rated at 5 kW(ac). The ESS inverter is ac coupled with the PV microinverters."

| Residential configuration | Minimum sustainable price | Modeled market price |

| --- | --- | --- |

| 8 kWdc PV plus 13.5 kWh storage | $4.33 per Wdc | $4.59 per Wdc |

| 8 kWdc PV only | $2.78 per Wdc | $2.95 per Wdc |

The published uncertainty on the storage case is wide: a minimum sustainable price range of $3,671 to $4,875 per kW and a modeled market price range of $3,712 to $5,076 per kW.

Our own arithmetic on those two published rows, stated as arithmetic rather than as a price: the modeled market price difference is $1.64 per Wdc, which across an 8 kWdc system is about $13,100 attributable to a 13.5 kWh storage cabinet and its inverter, or roughly $970 per kWh. That figure is a subtraction between two modeled benchmarks, not a market price, and the caveats in the next section apply to it in full.

The benchmark series has also changed shape, which matters if you go looking. The last report published as "U.S. Solar Photovoltaic System and Energy Storage Cost Benchmarks" covers Q1 2023 (NREL/TP-7A40-87303). The lab states that "Through 2022, benchmarks were developed using bottom-up cost models. Beginning in 2023, installed system cost benchmarks have been produced using the PV System Cost Benchmark (PVSCB) framework. Since 2024, this work has been conducted as a DOE-led joint laboratory effort." So the newest benchmark is Q1 2025, published in 2024 dollars, and there is no 2026 edition.

Why a benchmark is not a quote

The labs are unusually blunt about this, and quoting them is more useful than paraphrasing.

From "Documenting 15 Years of Reductions in U.S. Solar Photovoltaic System Costs" (NREL/TP-7A40-92536, January 2025): "These benchmarks are designed to provide representative estimates, rather than precise costs in any given location." And: "These benchmarks are not intended to replace local or customer-specific market prices, nor should local market prices be used as substitutes for the benchmarks."

The same report explains why the two diverge, and it is a good checklist for reading your own bid. First, the benchmark reflects "costs incurred by a typical, experienced installer in a competitive market," while the residential industry contains companies with very different cost structures. Second, it covers "a representative system installation," while reported prices "may include premium system features and costs of complementary services such as additional electrical work, securing financing, additional roofing services, and other home upgrades." Third, the lab states it "does not have robust data on profit margins."

There is also a large exclusion. The Q1 2023 report states that "the benchmarks exclude financing costs, which can represent around 20% of reported market prices." If you are being quoted a monthly payment rather than a price, that exclusion is doing a lot of work.

What reported prices say, and how far behind they are

The other federal data product reports what people actually paid, which is a different thing from what a system should cost.

Lawrence Berkeley National Laboratory's "U.S. Distributed Solar and Storage Data: 2025 Update," published in September 2025, reports systems installed in 2024 in real 2024 dollars. Its published residential figures:

• Median installed price for host-owned, stand-alone residential PV: $4.0 per W-DC, with a 20th percentile of $3.0 and an 80th percentile of $5.2.
• "The median cash price of paired residential systems in 2024 was $1.7/W higher than for stand-alone systems."
• "For residential PV, loan-financed systems were considerably higher priced than cash-purchase systems in 2024 (median prices of $4.7/W vs. $3.5/W), due partly to the loan fees rolled into the up-front price."
• "Residential battery storage systems had a median size of 13.5 kWh in 2024, with most systems ranging from 10-20 kWh," and "median storage duration was 2 hours."
• "Soft costs and other BoS costs collectively represent roughly 80% of the total installed price of residential systems."

Two caveats attach to all of that, and LBNL supplies both. The prices come from incentive programs, renewable energy credit registries, and interconnection processes, and are "as reported by the installer, host customer, or other incentive applicant," with the lab noting the data "may suffer simply from self-reporting errors, and the level of verification vary across data providers." And the lag is structural: a report published in late 2025 describes 2024 installations, and as of today the summary covering 2025 installations has not been published.

Note also what those numbers are not. Both labs report solar-plus-storage prices per watt of solar, which is a solar denominator on a storage question. That is a deliberate choice so the paired and unpaired cases can be compared, but it means neither product gives you a current dollars-per-kilowatt-hour figure for a battery.

The only lab figure of that shape we could find is six years old. LBNL's one-off "Behind the Meter Solar+Storage: Market data and trends" report, published July 2021 on 2020 installations, states that "Depending on the data source used, the cost of adding storage to PV ranges from roughly $700-1300/kWh of storage capacity." Cite it if you like, but cite the year with it. Cell prices, product mixes, and the entire federal incentive picture have all changed since.

The lines your decisions actually move

None of the following is published by anybody, because none of it is a property of a battery.

Backup scope. Whole home or a protected subpanel is a decision, and it is usually the largest one you personally control. Partial backup means a critical loads panel and the labor to move circuits into it. Whole home means the service can carry it. Our whole home versus essentials explainer covers the trade.

Main panel and service work. Whether your existing panel and busbar can accept a new source without an upgrade is the classic swing item, and it is answered by a site assessment. Several makers now sell controllers whose explicit pitch is avoiding this work. Those are claims about hardware, not findings about your house, and they should appear in your quote as findings.

Permitting, inspection, and interconnection. The federal model names this as its own activity, abbreviated PII, split across office work for the permit preparation and jurisdictional fee and fieldwork for the on-site labor supporting inspection. The model treats those as largely fixed, described in its own input notes as nearly independent of system size. Fixed costs land hardest on small systems, which is one honest reason a 5 kWh install is rarely a fifth the price of a 25 kWh one. Neither lab publishes a current percentage share for PII, so treat any specific figure you are shown as an estimate. What is published is the direction: the National Laboratory of the Rockies reports that residential soft cost shares peaked at 68 percent in 2017 and that "Soft cost reductions across all sectors have lagged behind hardware cost reductions."

Location and mounting. Distance from the battery to the panel is conduit, trenching, and hours. Indoor versus outdoor changes the clearance and fire arguments an installer has to make to your authority having jurisdiction, which our UL 9540 and NFPA 855 guide covers. Our installation location guide covers the physical constraints.

Solar coupling. Whether the battery is designed into a new solar system or retrofitted behind an existing array changes what hardware is used and what is wasted. Retrofits frequently strand an integrated inverter you paid for.

Financing. Per the benchmark's own exclusion, this is around a fifth of reported market prices and it is invisible if you shop on monthly payment. Ask for the cash price and the financed price on the same sheet.

Removal at end of life. Rarely quoted, occasionally relevant. The Environmental Protection Agency's guidance on used lithium-ion batteries, last updated March 20, 2026, states that these batteries "should NOT go in household garbage or recycling bins," that medium and large-scale systems "may not be able to be removed by the consumer," and that for energy storage you should "Contact the energy storage equipment manufacturer or company that installed the battery." That is fine advice while both still exist.

How to compare two bids

1. Get both bids itemized into hardware, labor, permit and interconnection fees, and any panel or service work, rather than as one number.

2. Confirm the backup scope on each. A whole-home bid and a partial bid are not competing offers for the same thing.

3. Ask which panel finding each bid is based on, and whether the site assessment happened before or after the number.

4. Ask who pays the permit and interconnection fees, and what the current queue is in your jurisdiction.

5. Ask for the cash price alongside any financed price.

6. Check what happens on a change order if the site assessment finds something.

Then run your own numbers in the Worth It calculator, and read our 2026 cost guide for the whole-purchase picture.

The 2026 federal position

There is no federal purchase credit reducing any of the above. The Section 25D residential clean energy credit expired on December 31, 2025, so a cash or loan buyer in 2026 receives no federal credit on equipment or on labor. Section 48E survives and belongs to whoever owns the system, so it reaches a homeowner only through a lease or power purchase agreement. Our 2026 tax credit guide has the detail, and our state incentive guide covers what is left at the state and utility layer, which is now the whole of the subsidy story.