Solar Panel Cost and Payback: Buy, Lease or PPA?
Rooftop solar can cut your electricity bills for decades, but whether it makes financial sense depends heavily on where you live, how you pay, and the rules of your local utility. This guide explains how pricing works and how to judge whether an offer is a good deal.
How solar is priced
Installers usually quote by system size in kilowatts (kW), and a common way to compare offers is the price per watt: the total installed cost divided by the system's size in watts. Comparing price per watt is much more useful than comparing total prices, because systems are sized differently. As a rough guide, a typical home system is commonly quoted in the range of tens of thousands of dollars before any incentives, but the spread between installers and regions is wide.
What drives the cost
- System size. Set by your electricity use, roof space and budget.
- Equipment. Panel efficiency, inverter type (string inverter, microinverters or optimizers) and mounting hardware.
- Roof complexity. Multiple roof faces, steep pitch, shading and tile or slate roofs add labor.
- Roof condition. If your roof will need replacing within a few years, do that first. Removing and reinstalling panels later is an extra cost.
- Electrical upgrades. Some homes need a new main panel or service upgrade.
- Battery storage. Adding a battery provides backup power and can help where export rates are low, but it adds significantly to the cost.
- Permits, inspection and utility interconnection fees.
Estimating payback
The payback period is how long it takes for bill savings to equal what you paid. You can make a rough estimate yourself:
- Start with the installed price, minus any incentives you are confident you qualify for.
- Estimate the system's yearly production. Installers provide this, and free public tools can give an independent estimate for your address.
- Multiply that production by what the electricity is actually worth to you. This depends on your rate and on your utility's rules for power you send back to the grid.
- Divide the net cost by the yearly savings.
Payback is faster where electricity is expensive, sunshine is strong, and the utility credits exported power generously. It is slower where rates are low or export credits are small. Be wary of any quote that assumes steep future electricity price increases to make the numbers work; ask to see the savings with no rate increase too.
Buy, lease or PPA?
| Option | How it works | Trade-offs |
|---|---|---|
| Cash purchase | You pay upfront and own the system. | Usually the best long-term value. You receive any incentives you qualify for, but you are responsible for maintenance after warranties. |
| Solar loan | You own the system and repay a loan. | Little or no upfront cost. Compare the interest rate and any "dealer fees" built into the price, which can be large. |
| Lease | You pay a fixed monthly fee to use a system a company owns. | Low upfront cost and maintenance is included, but savings are smaller and the company typically keeps the incentives. |
| Power purchase agreement (PPA) | You pay for the electricity the system produces, at a set rate. | Similar to a lease. Watch for annual price escalators that can erode savings over time. |
Leases and PPAs often run 20 years or more. Read what happens if you sell your home: the buyer may need to qualify to take over the contract, and some buyers are put off by it.
Incentives
Federal tax credits, state programs, utility rebates and local property tax rules for solar have changed many times and can change again. Do not rely on an installer's sales sheet for incentive amounts. Check the current federal rules and your state energy office, ask your utility about rebates and net metering, and consider talking to a tax professional about whether you can actually use a tax credit.
How to hire a solar installer and compare quotes
- Get at least three written quotes and compare them on price per watt and estimated yearly production.
- Check licensing. Solar involves roof work and electrical connections to your home. Look for a licensed electrical contractor and ask who does the work: the company's own crews or subcontractors.
- Confirm permits and interconnection. The installer should handle permits, inspection and the utility's approval before the system is switched on.
- Compare warranties on panels, inverters and workmanship, including roof penetrations.
- Ask about shading and roof condition and ask to see the panel layout.
- Be cautious with door-to-door sales, offers that sound "free", and pressure to sign the same day. Take time to read any financing or lease contract in full.
The bottom line
Solar can pay off well, but the numbers depend on your rates, sunshine, roof and utility rules. Compare several quotes on price per watt, check current incentives yourself, and understand the full contract before you sign.