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Guide
How to read a solar quote
The single most useful number on any solar quote is the price per watt: the total system price divided by the system size in watts. The NREL/SEIA national residential benchmark is around $3.00 per watt, so a quote well above that (say $4 to $5 or more per watt) deserves hard questions. After the price per watt, check the equipment, the production estimate, and the warranties. One 2026 red flag stands out: any installer who quotes you a 30% federal tax credit on a cash or loan purchase is wrong, because that credit ended for systems placed in service after 2025. Then ignore any pressure to sign on the spot.
The price-per-watt yardstick
Solar quotes come dressed up with monthly payments, "savings," and financing that make direct comparison hard. Cut through it by reducing every quote to one figure. Take the total system price before incentives and divide by the system size in watts. A 7 kW system is 7,000 watts, so a $21,000 quote is exactly $3.00 per watt. Do this for every quote and you can compare them on the same footing regardless of how each salesperson framed it.
Use the pre-incentive price so you are always comparing like with like. Many competitive cash quotes land roughly between $2.50 and $3.50 per watt. Below that can be excellent or can signal cut corners; well above it usually means high sales-and-marketing overhead, expensive financing rolled in, or simply a padded margin. This is the same benchmark our report uses to estimate a fair installed cost, so your payback number and your quotes speak the same language.
What line items to check
Once the price per watt passes, read the details. A trustworthy quote names specifics; a weak one hides behind round numbers.
- Panel make, model, and wattage: real product names and a total DC system size in kW, not just a count.
- Inverter type: string inverter, microinverters, or optimizers. This affects shading performance and price.
- Estimated annual production (kWh): the number your payback depends on. Sanity-check it against your local sun with NREL PVWatts.
- Warranties: separate panel, inverter, and workmanship terms, plus who honors them.
- Scope of work: roof condition, any needed electrical panel upgrade, permits, and interconnection fees, all itemized.
- Monitoring: whether production monitoring is included so you can verify the system performs as sold.
The 30% credit is a 2026 red flag
The 30% federal Residential Clean Energy Credit (26 U.S.C. §25D) ended for systems placed in service after December 31, 2025. So if you are buying with cash or a loan in 2026 and an installer's quote shows a "30% federal tax credit," a "net price after the credit," or bakes that credit into the monthly payment math, the quote is wrong. Treat it as a sign the salesperson is either out of date or hoping you are, and walk away. The only place a federal credit legitimately appears now is a third-party lease or power-purchase agreement, where the company that owns the panels claims the commercial credit and may pass some value back as a lower rate; even then, ask them to show the ownership terms in writing, because you will not own the system.
Financing and sales tactics to ignore
Financed solar can cost far more than cash for the same hardware because of hidden dealer fees, sometimes 10 to 30% of the system price, folded silently into the loan. Always ask for the cash price and the financed price and compare the price per watt of each. "Zero down" is a payment structure, not a discount. And treat the classic high-pressure playbook as noise: a "today-only" price, a discount that vanishes if you do not sign on the visit, a manager "specially approving" your deal, or claims your roof was "selected" for a program. A genuinely good price is still good next week. Take the quote home, benchmark it, and decide on your schedule.
| Line on the quote | What good looks like | Red flag |
|---|---|---|
| Price per watt (pre-incentive) | Roughly $2.50 to $3.50/W | $4 to $5+/W with no clear reason |
| Equipment | Named panel and inverter models | Vague "premium panels," no models |
| Production estimate | Annual kWh you can check vs PVWatts | No kWh figure, or one that looks inflated |
| Federal tax credit | Not on a 2026 cash or loan quote (it ended); only via a lease or PPA | A 30% federal credit promised on a 2026 purchase, or baked into the payment math |
| Financing | Cash price and loan price both shown | Only a monthly payment, no cash price |
| Timeline pressure | Quote valid for a reasonable window | Sign-today-only, expiring discount |
Key takeaway: reduce every quote to price per watt on the pre-incentive cash price, then read the equipment, production, warranty, and credit lines. If a quote is far above the benchmark or leans on urgency, it is selling you the sale, not the system.
How does an independent estimate help me here?
The hardest part of judging a quote is not having a neutral number to hold it against. That is exactly what this report gives you: a fair system size, an installed cost built from the NREL/SEIA $3.00 per watt benchmark, no phantom federal credit padding the math, and a payback year, all before you take a single sales call. Walk into the conversation already knowing what a reasonable price looks like for your house.
Before you compare quotes, it helps to know what solar should cost and how the money works. See solar panel cost, how the payback period is calculated, and why the federal tax credit no longer applies to a 2026 purchase. Full model detail is in our methodology.
A neutral system size, cost, and payback year to hold every installer quote against. An independent estimate, not a quote.