Compare these six things on every quote
- System size: compare total system size in kW and make sure similar proposals are being compared.
- Expected production: look at estimated annual kWh, shading assumptions, panel orientation, degradation, and whether the estimate seems realistic.
- Total price: compare the cash price, price per watt, financing fees, interest, escalators, and total payments over time.
- Equipment: compare panels, inverter type, battery if included, monitoring, and any electrical or roof work included in the price.
- Ownership and incentives: know who owns the system, who receives available incentives, and what happens if you sell the home.
- Warranties and service: check equipment warranties, workmanship coverage, service responsibilities, cancellation terms, and any production guarantees.
Red flags to watch for
- A quote focuses only on the monthly payment.
- Production assumptions are unusually aggressive.
- The cash price is difficult to find.
- Financing fees are not clearly disclosed.
- Savings depend on large assumed utility-rate increases.
- Incentives are presented as guaranteed.
- Important roof or electrical work is excluded.
- The agreement is difficult to review before signing.
Compare apples to apples
Use the same checklist for every proposal
- System size: ____ kW
- Annual production: ____ kWh
- Cash price: $____
- Price per watt: $____/W
- Financing total: $____
- Battery included: Yes / No
- Ownership: Homeowner / Third party
- Major warranties: ____
Ask each provider for an itemized proposal and a copy of the agreement before choosing. A strong proposal should make the price, production assumptions, equipment, financing, and responsibilities easy to understand. If the economics only look good because of optimistic assumptions, compare more carefully.