A solar quote needs review when its price, bill savings, production assumptions or payment obligations cannot be checked. Start with a written cash price and system scope. A low monthly payment or a large lifetime-savings figure cannot establish value on its own.
Use the cash quote comparison calculator to normalize installation offers. Review borrowing separately in the fixed-rate loan calculator; it does not analyze leases, PPAs or every possible payment schedule.
Reviewed October 17, 2026. Examples are hypothetical, not installer offers.
Price and scope warning signs
- No cash price: ask for the solar-only cash amount, financed purchase price and all additional financed fees.
- Battery and upgrades blended into price per watt: separate storage, roofing and electrical work before comparing solar-only $/W.
- Unclear equipment: request panel and inverter models, DC size, installation scope and exclusions.
- Oversizing without an explanation: ask how extra production will be used or credited under your tariff.
Savings and incentive warning signs
A promise to eliminate the electric bill needs evidence. Fixed charges, minimum bills, export limits and seasonal imports can remain. Ask for self-consumption, export credit and future rate assumptions, and test a lower-benefit case in the bill-savings calculator.
A tax credit shown as an automatic discount also needs correction. The IRS says Section 25D is unavailable for property placed in service after December 31, 2025. Do not budget for the former 30% homeowner credit on a new 2026 installation. Verify other programs, who receives the payment and when it is usable.
Production should have an identifiable roof layout, weather basis and loss assumptions. Check the inputs using the PVWatts guide. A higher promised kWh figure does not make a quote better if the model is unsupported.
Financing can hide a different total cost
Suppose a cash offer is $24,000 and a financing contract schedules $32,000 in total payments. With $1,650 in first-year bill reduction, dividing those amounts gives 14.5 and 19.4 years respectively.
The 19.4 figure is only a rough cost-to-first-year-benefit ratio, not a calculated financed break-even date. It ignores when repayments and savings occur, upkeep, future changes and benefits after the loan ends. The cash figure also omits upkeep. To assess borrowing, use the actual payment schedule and a year-by-year cash-flow comparison.
Check the contract interest rate, APR, term, financed price, fees, total repayment, expected lump sums and any payment increase. Do not enter a fee twice if it is already included in the financed price. A fixed-payment calculator cannot represent a contract whose payments change.
The CFPB’s August 2024 report explains risks involving financing markups and expected prepayments. Its historical tax-credit discussion is not current eligibility guidance.
Contract and service questions to resolve
- What do production and workmanship warranties actually cover, and who provides service?
- Who pays for removal and reinstallation if the roof needs work?
- What happens if the installer or equipment supplier stops operating?
- Are there sale, transfer, lien, prepayment, escalator or end-of-term obligations?
- Are all material promises included in the written agreement?
A deadline or sales claim is not a substitute for answers. The Department of Energy homeowner guide provides broader questions for installers. Keep unresolved assumptions marked as unknown, request comparable proposals and revisit the numbers before committing.
