A bad solar quote rarely looks bad. It looks polished, confident, and slightly cheaper than the honest one next to it. These seven red flags show you how to read between the lines before you sign.
- Quotes without exact equipment model numbers are not quotes. They are estimates designed to be revised upward.
- Any production estimate above 1,700 kWh per kW per year in most of the US deserves a hard look at the shading analysis.
- If a 2026 quote still subtracts the 30% federal tax credit from your cost, the math is wrong. The 25D credit ended for post-2025 installs.
- Financed prices hide dealer fees of 20 to 30 percent. Always ask for the cash price.
- Pressure tactics are a red flag by themselves. Honest pricing does not expire at midnight.
Your Quote Is a Window Into the Company
Homeowners tend to treat solar quotes like price tags. They are closer to resumes. A detailed, specific quote comes from a company with a real design process. A vague one comes from a sales operation that figures out the details after you sign, usually at your expense.
Keep that frame as you read these flags. None of them alone proves a company is dishonest. Two or three together form a pattern, and patterns are what you are shopping for. If you have not yet met your installers in person, start with our 15 questions to ask before signing, then use this guide to grade the paper they hand you.
Red Flag 1: Brand Names Instead of Model Numbers
“Premium Tier 1 panels with Enphase microinverters” tells you almost nothing. Within any major brand there are multiple product lines at different price points and quality tiers, and “Tier 1” is a BloombergNEF bankability ranking, not a quality grade. A real quote lists exact models: panel make and model, inverter model, racking brand, and panel count and wattage.
Why it matters: without model numbers, the installer can substitute cheaper equipment at install time and you have no contractual leg to stand on. It also makes comparison shopping impossible, which is precisely the point. Ask for the datasheet of every major component. If the salesperson cannot produce model numbers, they did not design your system. They priced a vibe.
Red Flag 2: A Production Number With No Math
Every quote includes an estimated annual production figure, something like “12,400 kWh per year.” That number drives the entire savings pitch, so it deserves scrutiny. Ask how it was calculated. A legitimate estimate comes from a shading analysis (drone imagery or a tool like Aurora), your roof’s azimuth and tilt, local weather data, and realistic system losses of 10 to 15 percent.
The tell: divide the annual kWh by the system size in kW. In most of the US, honest results land between 1,200 and 1,700 kWh per kW per year depending on region. Phoenix roofs can exceed that; Seattle roofs will not. If a quote shows numbers far above the local norm with no shading report attached, the production is inflated to make the payback look shorter. Ask for the shading analysis and the loss assumptions in writing. Companies that did the work will show it proudly. This is also the number to cross-check after your site survey, when real measurements replace satellite guesses.
Red Flag 3: One Price, No Mention of Dealer Fees
Solar loans with low advertised interest rates carry dealer fees, typically 20 to 30 percent of the loan amount, paid by the installer to the lender and passed to you in a higher contract price. A $30,000 financed quote might represent a $23,000 system plus a $7,000 finance charge you never see itemized.
The honest version of a quote shows the cash price and the financed price side by side and names the dealer fee. The red-flag version shows one number and a monthly payment, steering your eyes away from the total. Always ask: “What is the cash price for this exact system?” Then compare that cash price across installers. Financing is a separate decision from choosing an installer, and mixing the two is how the most expensive quotes win bids.
Red Flag 4: The 30% Tax Credit in 2026 Math
This one is new and it is everywhere. The federal 25D residential clean energy credit ended for systems installed after December 31, 2025. If your system goes live in 2026, you do not get the 30 percent credit, full stop. Systems installed in 2025 can still claim it on 2025 taxes via Form 5695.
Yet quotes circulating in 2026 still show “price after tax credit” figures that subtract 30 percent, making systems look thousands cheaper than they are. Sometimes this is an outdated template. Sometimes it is deliberate. Either way, the math is wrong for your situation. Verify the current law at irs.gov and read our full breakdown of what 2026 buyers get instead of the federal credit. Any installer still pitching the 30 percent credit for a 2026 install has told you everything about their attention to detail.
Red Flag 5: Escalator Clauses Buried in Leases
Solar leases and PPAs often include annual escalator clauses of 2 to 4 percent, meaning your “locked-in” rate climbs every year for 25 years. At 3.5 percent annual escalation, a payment that starts 20 percent below your utility rate can exceed it within a decade if utility rates rise more slowly than the contract assumes.
The red flag is not the escalator itself. It is the presentation: a salesperson quoting only the year-one rate and the year-one savings while the escalation schedule sits on page 14. Ask for the total 25-year cost of the lease versus the projected utility cost, and ask what the buyout terms are if you sell the house. Our lease vs purchase guide walks through the full comparison. If the rep cannot explain the escalator plainly, they are hoping you will not ask.
Red Flag 6: Pressure Tactics and Vanishing Discounts
“This pricing expires tonight.” “We only have two install slots left this month.” “The federal program ends Friday.” High-pressure urgency is the oldest trick in home improvement sales, and it works because it short-circuits comparison shopping, which is exactly what the other six red flags need you to skip.
Real constraints exist. Utility rate changes, net metering deadlines, and genuinely busy install seasons are real. The difference is documentation: a real deadline comes with a utility notice or a program document you can verify independently. A manufactured deadline comes with a salesperson who gets uncomfortable when you say you need a week. Never sign under same-day pressure. The honest installer will honor the quote next week, because honest numbers do not expire at midnight.
Red Flag 7: Vague Scope and Verbal Warranties
“We handle everything, permits included.” “Don’t worry, the roof is covered.” Verbal promises in solar sales are worth exactly nothing. The scope section of a good contract names what is included: permits, utility interconnection, main panel upgrade if needed, monitoring setup, critter guards, and the specific flashing method for roof penetrations. It also names what is not included and what triggers a change order.
Warranties work the same way. “25-year warranty” means nothing until you know which warranty: manufacturer product warranty, performance warranty, inverter warranty, workmanship warranty, or roof penetration warranty, each with different terms and different holders. Get every warranty in the contract with its term and the party responsible for honoring it. Pay special attention to permitting responsibility, since permit requirements vary widely by city, and a vague “we handle permits” with no timeline attached is a delay waiting to happen.
| Red flag | What you see | What to ask instead |
|---|---|---|
| Vague equipment | Brand names, no models | “Give me exact model numbers in the contract.” |
| Inflated production | High kWh, no shading report | “Show me the shading analysis and loss assumptions.” |
| Hidden dealer fees | One price, monthly payment focus | “What is the cash price for this exact system?” |
| Phantom tax credit | 30% subtracted for 2026 install | “Show me the IRS guidance for a 2026 install.” |
| Escalator clauses | Year-one rate only | “What is the total 25-year cost with escalation?” |
| Pressure tactics | Expiring discounts | “Put the deadline and its reason in writing.” |
| Vague scope | Verbal promises | “List every inclusion and warranty in the contract.” |
A clean quote, by contrast, reads almost boring: exact models, a production estimate with a shading report, cash and financed prices side by side, a written scope, named warranties, and a salesperson who answers follow-up questions without flinching. Boring is good. Boring means someone did the engineering before the selling. The Department of Energy’s homeowner’s guide to going solar describes the same fundamentals from a neutral source, and it is worth an hour before you sign anything. For the full project picture, see how long installation actually takes so no timeline promise goes unquestioned.
Is the cheapest quote always a red flag?
Not always, but a quote far below the others deserves the full seven-flag inspection. Sometimes it reflects genuine efficiency. More often it reflects vague equipment, an inflated production estimate, or scope items that will reappear as change orders.
Can I trust online solar quote marketplaces?
They are useful for gathering bids quickly, but treat every bid as a starting point. Verify the company behind each quote with the questions in our installer guide, and never accept a quote without a site survey backing its production numbers.
What should a solar quote definitely include?
Exact equipment models, system size in kW and panel count, cash and financed prices, estimated annual production with its basis, full scope of work, all warranty terms, and the installer’s license number.
Are door-to-door solar sales always bad?
No, but the format rewards pressure over precision. If a door-to-door rep’s quote survives all seven checks and the company checks out, it can be fine. Most do not survive the checks, which is why the channel has its reputation.
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