What solar panels actually do and what they cost

Solar panels convert sunlight into electricity for your home. A typical residential system costs between $15,000 and $25,000 before any tax credits or rebates, though the price varies by your location, roof size, and the installer you choose. Most homeowners finance this through a loan, a lease, or a power purchase agreement rather than paying cash upfront.

The system includes panels mounted on your roof, an inverter that converts DC power to AC power your appliances use, wiring, and usually a monitoring system so you can track production. Installation typically takes one to three days. After that, the panels require minimal maintenance — occasional cleaning and an inspection every few years.

Key Takeaways

  • Solar panels reduce your monthly electricity bill by 50 to 90 percent depending on system size, your location, and how much sun your roof receives.
  • The federal Investment Tax Credit currently covers 30 percent of installation costs, and many states and utilities offer additional rebates that lower your out-of-pocket expense.
  • Most homeowners break even on their solar investment in 6 to 12 years, after which the electricity is essentially free for the remaining 25 to 30 year lifespan of the panels.
  • Homes with solar panels sell for 3 to 4 percent more on average, and buyers often view solar as a desirable feature rather than a liability.
  • Financing options include cash purchase, loans, leases, and power purchase agreements, each with different upfront costs and long-term savings.

How much your electricity bill will drop

The size of your bill reduction depends on three things: how much electricity your home uses, how much sun your roof gets, and how big a system you install. A 6-kilowatt system in a sunny state like California or Arizona typically produces 8,000 to 10,000 kilowatt-hours per year. A 6-kilowatt system in a cloudier state like Oregon or Massachusetts produces 6,000 to 7,500 kilowatt-hours per year.

If your current electricity bill is $150 per month, a well-sized system usually cuts that to $15 to $30 per month. You still pay a small fixed charge to stay connected to the grid. On days when your panels produce more than you use, most utilities credit that excess power back to your account through a process called net metering — though net metering rules vary by state and utility, so check your local rules before you install.

Your actual savings also depend on your electricity rate. States with higher rates (like California, Massachusetts, and New York) see faster payback periods. States with lower rates (like Louisiana and Oklahoma) take longer to recoup the investment, but the long-term savings are still substantial.

Tax credits, rebates, and other financial incentives

The federal Investment Tax Credit (ITC) currently allows you to deduct 30 percent of your installation costs from your federal income taxes. This is a tax credit, not a rebate — you claim it when you file your taxes in the year the system is installed. If your system costs $20,000, the ITC is worth $6,000. The credit applies whether you buy the system outright or finance it with a loan.

Many states offer additional rebates or tax credits. California, New York, Massachusetts, and Colorado have state-level incentives that stack on top of the federal credit. Some utilities offer rebates directly to customers who install solar. The Database of State Incentives for Renewables and Efficiency (DSIRE) lists what is available in your state — you can search by zip code to see your specific options.

If you lease a system or use a power purchase agreement instead of buying it, you typically do not claim the tax credit yourself — the company that owns the system claims it and passes some of the savings to you through a lower lease payment or electricity rate. This is one reason leases often have lower upfront costs.

Payback period and long-term savings

The payback period is how long it takes for your electricity savings to equal what you spent on the system. For a homeowner who buys a $20,000 system outright and receives a $6,000 federal tax credit, the net cost is $14,000. If that system saves $1,500 per year in electricity, the payback period is roughly nine years.

After you break even, the electricity your panels produce is essentially free. Since most residential panels last 25 to 30 years, you have 15 to 20 years of nearly free electricity after payback. Over the full lifespan of the system, total savings typically range from $10,000 to $30,000, depending on your location and electricity rates.

Payback is faster if you finance with a loan and the loan payment is lower than your current electricity bill. For example, if your electricity bill is $150 per month and a solar loan costs $120 per month, you save $30 per month when ready, even before accounting for the tax credit. Payback periods are longer if you lease, because you pay a monthly lease fee instead of owning the system, but your upfront cost is also much lower or zero.

How solar panels affect your home's resale value

Homes with solar panels sell for 3 to 4 percent more on average, according to studies by the National Renewable Energy Laboratory and Zillow. A $400,000 home with solar might sell for $412,000 to $416,000. The premium is larger in states with high electricity rates and strong solar adoption, and smaller in states where solar is less common.

Buyers view solar as a desirable feature because it means lower electricity bills and less environmental impact. However, the premium applies only if you own the system outright or have paid it off. If you have a lease or power purchase agreement on the panels, the new owner inherits that contract, which can complicate the sale. Some buyers are willing to take over the contract; others are not. If you plan to sell within five to seven years, owning the system outright or financing with a loan is usually better than leasing.

Disclosure rules vary by state. In most places, you must tell the buyer that solar panels are present and provide copies of the lease or loan documents if applicable. Some states require a solar disclosure form. Check your state's real estate commission website for specific rules.

Financing options: buying, loaning, leasing, and power purchase agreements

You have four main ways to pay for solar: cash, a loan, a lease, or a power purchase agreement (PPA).

Buying with cash means you own the system outright, claim the full federal tax credit, and keep all electricity savings. You have no monthly payment. This option requires the most money upfront but produces the highest long-term savings.

Financing with a loan means you borrow money to buy the system, own it once the loan is paid off, and claim the tax credit. Monthly loan payments are typically lower than your current electricity bill, so you save money when ready. After the loan is paid off (usually in 5 to 10 years), the electricity is free. This is the most common option for homeowners who have good credit and can may have access to for a loan.

Leasing

Power purchase agreements (PPAs)

Roof condition, shading, and whether your home is suitable

Solar panels work best on south-facing roofs with minimal shade from trees or buildings. If your roof is heavily shaded, panels will produce less electricity and may not be worth the cost. A solar installer can assess your roof's sun exposure using satellite imagery and on-site measurements.

Your roof must be in good condition. If your roof is nearing the end of its lifespan (typically 20 to 25 years for asphalt shingles), you should replace it before installing solar. Removing and reinstalling panels to replace a roof is expensive. If your roof is relatively new, solar panels will not damage it — they are mounted with flashing that prevents water leaks.

Flat roofs, metal roofs, and tile roofs can all accommodate solar panels. The main limitation is shade. If you have large trees on the south side of your home, trimming them may help. If shade is unavoidable, ground-mounted systems are an option, though they cost more and require available yard space.

Some older homes or homes in historic districts have restrictions on exterior modifications. Check your local zoning rules and homeowners association rules before you commit to solar. A few states and municipalities require permits or approval before installation.

Maintenance, warranties, and what happens if panels break

Solar panels require very little maintenance. You may need to rinse them off once or twice a year if you live in a dusty area or if bird droppings accumulate. Most installers recommend a professional inspection every three to five years to check wiring, connections, and the inverter.

Most panels come with a 25-year warranty covering defects and degradation. This warranty guarantees that panels will produce at least 80 percent of their original output after 25 years. Inverters typically have a 10 to 15 year warranty and may need replacement during the system's lifespan — replacement costs $2,000 to $4,000.

If a panel is damaged by weather, hail, or an accident, your homeowners insurance usually covers it if you have comprehensive coverage. Some installers offer additional warranties that cover weather damage. Check your policy before installation to understand what is covered.

Frequently Asked Questions

Do solar panels work on cloudy days?

Yes, but they produce less electricity. On a cloudy day, panels typically produce 10 to 25 percent of their rated capacity. This is why location matters — states with more sunny days produce more total electricity per year. Even in cloudy climates, solar panels still reduce your electricity bill significantly over time.

What happens to my solar system if I move?

If you own the system outright or have a loan, you can leave it with the home or remove it and take it with you, though removal is expensive and rarely done. If you have a lease or PPA, the new owner must take over the contract or you must pay a buyout fee. Discuss this with your installer before signing any agreement if you think you might move within 10 years.

Can I install solar panels myself?

Most states require a licensed electrician to install solar systems and a licensed contractor to handle permitting and inspections. Doing it yourself voids warranties and may violate local electrical codes. Hire a licensed installer to may support the system is safe and meets all requirements.

How do I find a reputable solar installer?

Ask for referrals from neighbors or friends who have solar. Check the installer's credentials — they should be licensed, insured, and have references. Get quotes from at least three installers. Verify they are registered with the Better Business Bureau and check online reviews. Avoid companies that pressure you to sign the same day.

Will solar panels increase my property taxes?

In most states, solar panels are exempt from property tax increases. However, a few states do not offer this exemption, so check your state's tax rules. Even in states where solar adds to assessed value, the long-term electricity savings usually far exceed any tax increase.