How Much Does an 8 kW Solar System Cost in 2026?

An 8 kW solar system costs about $20,960 before incentives, according to EnergySage marketplace data updated July 6, 2026. That works out to about $2.62 per watt. It is also the size the U.S. Department of Energy uses for its benchmark home solar system, which makes 8 kW quotes unusually easy to sanity-check.

Key takeaways

• EnergySage's average 8 kW price was $20,960 before incentives in July 2026, with state averages from $16,312 in Texas to $23,755 in Massachusetts.
• The DOE's 2025Q1 cost benchmark models an 8 kW home system; its modeled market price was $2.95 per watt for solar only, about $23,600 (2024 dollars).
• An 8 kW system makes about 11,614 kWh a year at the U.S. average location, slightly more than the average home uses.
• Berkeley Lab data shows big price gaps between installers and between cash and loan purchases, so compare cash price per watt.
• The federal 25D credit is not allowed for expenditures made after December 31, 2025, so buyers of new systems get no federal credit.

How much does an 8 kW solar system cost in 2026?

EnergySage's 8 kW page puts the average at $20,960 before incentives. Its cost guide (June 30, 2026) also lists 8 kW systems at $2.62 per watt. Across all quotes on its marketplace, EnergySage reported a median of $2.57 per watt in the first half of 2026, about 3% higher than late 2025.

What the national cost benchmark says about 8 kW

The U.S. Department of Energy publishes a bottom-up cost model for a rooftop home system, with analysis by the National Laboratory of the Rockies (NLR, formerly NREL), Berkeley Lab and Sandia. Its benchmark home system is 8 kW, built from 20 panels of 400 watts each. For the first quarter of 2025, in 2024 dollars, it found:

DOE 2025Q1 benchmark (8 kW)	Per watt	For 8 kW (our math)
Solar only, modeled market price	$2.95	$23,600
Solar only, minimum sustainable price	$2.78	$22,240
Solar plus 13.5 kWh battery, modeled market price	$4.59	$36,720
Solar plus 13.5 kWh battery, minimum sustainable price	$4.33	$34,640

The modeled market price reflects what the model expects a typical installer to charge. The minimum sustainable price is the model's estimate of the lowest price a company could charge while staying in business.

The benchmark splits costs into eight groups: modules, inverters, energy storage, structural and electrical hardware, fieldwork, office work and other costs. It is a model, not a survey of real prices, but it is a useful check: a solar-only 8 kW quote far above $23,600 should come with a clear explanation.

Real installed prices tell a different story. Mercom, reporting Berkeley Lab's August 2026 data update, gives an inflation-adjusted 2025 median of $3.60 per watt for host-owned home systems, with cash purchases at $3.00 and loan-financed systems at $4.50. At the cash median, 8 kW would be $24,000 (our math), close to the DOE model.

8 kW solar system cost by state

EnergySage's average 8 kW prices before incentives, as of July 2026. Per-watt figures are our division.

State	Average 8 kW price	Per watt
Texas	$16,312	$2.04
Florida	$16,951	$2.12
Arizona	$18,260	$2.28
California	$19,612	$2.45
New Jersey	$20,425	$2.55
Washington	$20,797	$2.60
Colorado	$21,465	$2.68
New York	$22,114	$2.76
Maryland	$22,211	$2.78
Massachusetts	$23,755	$2.97

See our solar pages by state for local sunshine and electricity prices.

Is 8 kW the right size for your home?

EnergySage's PVWatts-based estimates show an 8 kW system producing about 11,614 kWh a year, or 968 kWh a month, at the U.S. average location. Phoenix gets about 14,117 kWh a year, Austin about 11,823 kWh, Boston about 10,478 kWh and Seattle about 8,749 kWh.

The EIA reports that the average U.S. home bought 10,791 kWh in 2022, about 899 kWh a month. So in many places an 8 kW system covers roughly an average home's yearly use. EnergySage notes, though, that the majority of shoppers on its marketplace need a 12 kW system, so do not assume you are average.

Check your last 12 months of bills and run the total through our solar panel calculator. With 400-watt panels, 8 kW is 20 panels (the same layout the DOE benchmark uses), so also confirm you have enough unshaded roof.

What drives the cost of an 8 kW system

Using the DOE's cost groups as a guide, here is where an 8 kW price can climb above the benchmark:

• Office work and sales. Customer acquisition, design and permitting are soft costs. EnergySage estimates permits and fees alone at about 8% of total cost.
• Fieldwork. Roofs with several planes, dormers or skylights need more equipment and labor, according to EnergySage.
• Electrical hardware. A main panel upgrade, if needed, adds parts and labor. Ask whether it is in the price.
• Installer margin. Berkeley Lab found 2025 medians among the 100 largest home installers ranged from about $2.4 to $6.3 per watt, or about $19,200 to $50,400 for 8 kW (our math).
• Financing. The CFPB's August 2024 report found dealer fees often add 30% or more above the cash price, and the fee is often left out of the APR.

Price per watt math for an 8 kW quote

Divide the cash price before incentives by the system size in watts. Example: $21,600 ÷ 8,000 = $2.70 per watt. A quote of $28,000 for 8.4 kW is $28,000 ÷ 8,400 = $3.33 per watt. That is $6,400 more in total for only 0.4 kW of extra capacity. See solar price per watt by system size for how prices change with size.

Tax credits and incentives

Federal credit status: buyers are out of luck. The IRS says the Section 25D credit is not allowed for expenditures made after December 31, 2025, and an expenditure is treated as made when the original installation is completed. Leases and PPAs are owned by the installer or a finance company; EnergySage says third-party-owned projects can still qualify for federal incentives through 2027, and that benefit belongs to the owner rather than the homeowner.

State, local and utility programs may still lower your cost. Check your state's rules on rebates, SRECs and net metering.

Should you add a battery or lease instead?

Two choices can change your 8 kW price more than anything else. The first is a battery. Berkeley Lab found that 37% of new home solar systems in 2025 included one, up from 25% in 2024. The DOE benchmark shows how much that adds in its model: the modeled price rises from about $23,600 for 8 kW of solar alone to about $36,700 with a 13.5 kWh battery. EnergySage reported battery pricing of $1,130 per kWh in the first half of 2026. Ask every installer to price the system with and without storage so you can judge each part on its own.

The second is ownership. EnergySage reported the share of its shoppers choosing leases and power purchase agreements rose from about 14% to roughly 41% during the first half of 2026. These can mean little or nothing upfront, but you do not own the panels. The FTC warns that lease payments may rise over time and that ending a lease early can be difficult and expensive. Our guide to solar lease vs buy compares both.

How to compare 8 kW quotes against the benchmark

The FTC suggests comparing detailed written bids from several companies, each showing the system size and expected output, the full installation cost including any building or electrical permit fees, any production guarantee and the warranties. With an 8 kW quote in hand, you can go one step further than for other sizes: put it next to the DOE model.

A solar-only quote near $23,600, or near EnergySage's $20,960 average, is in the normal range. One well above that should come with a reason you can see on paper, such as a panel upgrade, a complex roof or premium equipment. If a battery is included, compare against the $36,720 storage benchmark instead, and ask for the solar-only price too.

Next steps

Get a few written 8 kW quotes, convert them to cash price per watt and compare expected kWh. Then run them through our solar quote checker before you sign.