Is a 5 kW Solar System Enough for a House?

A 5 kW solar system is enough for a small or very energy-efficient house, but not for most average homes. EnergySage estimates a 5 kW system makes about 7,260 kWh a year at the U.S. average location, while the EIA says the average home used 10,791 kWh in 2022, so a 5 kW system covers roughly two-thirds of typical use (our math). EnergySage's average price for 5 kW was about $13,900 before incentives in mid-2026.

Key takeaways

• A 5 kW system produces about 7,260 kWh a year at the U.S. average location, or about 605 kWh a month (EnergySage, July 2026).
• That is enough for homes using well under the national average, or for partial coverage of a typical home.
• EnergySage's June 2026 cost guide puts 5 kW at about $13,900 before incentives, or $2.78 per watt, more per watt than any larger size it lists.
• Sunny locations get much more from the same system: Phoenix gets about 61% more than Seattle.
• Buyers get no federal 25D credit: it is not allowed for expenditures made after December 31, 2025.

Is a 5 kW solar system enough for your house?

It depends on two things: how much electricity you use and how much sun you get. The EIA reports that the average U.S. home used 10,791 kWh in 2022, about 899 kWh a month. The latest national average is about 1,152 kWh a month. Use varies widely by state: Louisiana homes averaged 14,774 kWh a year, while Hawaii homes averaged 6,178 kWh.

EnergySage says a 5 kW system may be enough to power a small home. It also notes that if you run central air, charge an electric vehicle or have a larger household, a 5 kW system likely won't cover all your needs.

Quick check: add up the kWh on your last 12 electric bills. If the total is close to or below the production figure for your area in the table below, a 5 kW system could cover most of your use.

How much electricity a 5 kW solar system produces

EnergySage's PVWatts-based estimates for a 5 kW system (July 2026), compared with the EIA's 2022 national average of 10,791 kWh bought per home:

Location	Yearly output (kWh)	Monthly output (kWh)	Share of average U.S. home use (our math)
Phoenix, AZ	8,824	735	82%
Los Angeles, CA	8,423	702	78%
Denver, CO	7,991	666	74%
Miami, FL	7,763	647	72%
Austin, TX	7,391	616	68%
U.S. average	7,260	605	67%
Philadelphia, PA	6,788	566	63%
Boston, MA	6,553	546	61%
Cleveland, OH	6,361	530	59%
Seattle, WA	5,467	456	51%

The last column is simple division and assumes average use. Your own share depends on your bills. Our solar panel calculator uses PVWatts data for your location.

Who a 5 kW system works well for

A 5 kW system can be a good fit when:

• Your home is small, well insulated or uses gas for heat, hot water and cooking.
• Your yearly use is well below the national average.
• Your roof has limited sunny space. As a rough estimate, 5 kW of 400-watt panels is about 13 panels.
• Your utility pays little for extra power you export, so a system that covers only part of your use avoids selling surplus cheaply.
• You want a lower upfront cost and accept a smaller bill reduction.

A 5 kW system is usually too small when you have central air in a hot climate, an electric vehicle, a heat pump, a pool or a large household. Berkeley Lab reports that the median U.S. home system installed in 2025 was 7.7 kW, and most were between about 5 and 12 kW, so many homes go larger. Our guide on what size solar system you need walks through sizing.

Making a 5 kW system go further

If a 5 kW system covers most but not all of your use, cutting demand can close the gap. Common steps include sealing air leaks, switching to LED lighting, using a programmable thermostat and running big appliances when your panels are producing. Our guide on how to lower your electric bill has more ideas.

Plan for the future, too. If you expect to buy an EV or switch to a heat pump, tell installers now. Designing for a bigger system later, or leaving room on the roof, can be cheaper than redesigning.

Think carefully before adding a battery to a small system. Berkeley Lab found that for cash purchases in 2025, solar-plus-storage systems cost a median $2.1 per watt more than solar alone, which on 5 kW would be about $10,500 extra (our math). A battery adds backup power but does not make the panels produce more energy.

How much does a 5 kW solar system cost?

EnergySage's 5 kW page (updated July 16, 2026) gives about $13,900 before incentives in its main text, though its summary box says $13,750. Its cost guide (June 30, 2026) lists 5 kW at $13,900, or $2.78 per watt, higher than the $2.58 for 10 kW and $2.47 for 15 kW. Smaller systems cost more per watt because permits, design and sales costs do not shrink much with size.

EnergySage's 5 kW state averages before incentives, as of July 2026:

State	Average 5 kW price
Texas	$10,195
Florida	$10,594
Arizona	$11,412
California	$12,257
New Jersey	$12,766
Washington	$12,998
Colorado	$13,416
New York	$13,822
Maryland	$13,882
Massachusetts	$14,847

Installed prices tracked by Berkeley Lab run higher. Mercom, reporting Berkeley Lab's August 2026 data update, gives 2025 medians of $3.00 per watt for cash purchases and $4.50 for loan-financed systems, or about $15,000 and $22,500 for 5 kW (our math). The CFPB has warned that loan dealer fees often add 30% or more above the cash price, so always get the cash price in writing.

5 kW solar system price per watt math

Price per watt is just the cash price divided by the system's watts (5 kW is 5,000 watts). A $14,500 quote for 5 kW is $2.90 per watt. A $19,000 quote for 5.2 kW is about $3.65 per watt. The second quote is only 0.2 kW bigger but costs $4,500 more, so ask what the difference pays for. Even small systems should be compared this way. See how to compare solar quotes side by side.

Tax credits, payback and what else to check

On the federal side, the answer is simple for buyers: no credit. Under IRS guidance, the Section 25D credit is not allowed for expenditures made after December 31, 2025, and the expenditure is treated as made when installation is completed. Leases and PPAs are owned by a company, and EnergySage reports those projects can still qualify for federal incentives through 2027, but the owner claims that benefit, not you.

Without the federal credit, payback depends more on your local electricity rate and your utility's rules for exported power. A 5 kW system that covers most of a small home's use in a state with high rates can still pay off, while the same system in a low-rate state takes longer. Check your utility's net metering tariff and any state rebates before deciding.

The FTC also suggests thinking about how long you will stay in your home. It says a home solar system is designed to stay on a home for at least 20 years.

Next steps

Total up 12 months of electricity use and compare it with the 5 kW output for your area. If 5 kW fits, get a few written quotes and check them with our solar quote checker.