A solar proposal can look precise while leaving important questions unanswered. The equipment list may be detailed, but the projected savings can depend on assumptions about your electric use, utility rules, roof conditions, and future power prices. A careful audit helps you see which numbers come from your home and which rely on estimates.

Start by separating current costs from historical incentives. A reference to the oncor solar rebate 2020 may help explain an older pricing discussion, but a past program or estimate does not establish what is available now. Ask the installer to identify any incentive included in your quote, name the organization that offers it, and provide current terms in writing. Do not subtract a rebate from the system price until you confirm that your household and project qualify.

Then check the proposal against documents you already have. Recent utility bills can show seasonal use and the rates you actually pay. A roof inspection or repair estimate can reveal costs that a sales appointment may not catch. These records give you a practical way to test the proposal before you compare financing options.

Trace every savings estimate to an assumption

Ask how the installer calculated the system’s expected production. The estimate should account for the roof’s direction, pitch, shade, panel layout, and local weather patterns. If the salesperson uses a single annual production figure, request the monthly estimate as well. Winter output and summer output differ, and that gap can affect how much electricity you buy from the utility.

Next, look at the assumptions about utility prices. A model that expects electricity rates to rise may show larger long-term savings than one that holds rates steady. That does not make the model useless, but you should be able to see the rate increase and change it to a more cautious figure. Also ask whether the estimate assumes net metering, export credits, or a particular utility plan. Those terms can change, so the proposal should not treat them as guaranteed for the whole system life.

Compare the full price, not the monthly payment

Financing can make a large project feel manageable while hiding the total cost. Compare the cash price with the financed amount, including dealer fees, interest, and any payment changes later in the loan. If a proposal shows a low first payment, find out whether that depends on a tax credit or a planned lump-sum payment. A tax benefit generally depends on a homeowner’s individual tax situation; it is not an automatic discount at installation.

Request an itemized quote. It should identify panels, inverters, mounting hardware, electrical work, permits, monitoring, and any roof work. A comparison based only on the price per watt may miss differences in equipment, labor, warranty coverage, or project scope. Two bids become easier to judge once each installer prices the same work.

Check the contract details that affect ownership

The contract should make clear who owns the system, who handles service calls, and what happens if the home is sold. Read the warranty terms for both equipment and workmanship. A manufacturer’s panel warranty does not necessarily cover a roof leak, wiring issue, or labor to replace a failed part.

Before signing, confirm the expected installation schedule and the steps required before the system can operate. Permits, utility approval, and inspection can take time. Ask who submits each application and who contacts you if a form or site visit is needed. Clear responsibilities reduce the chance that a completed installation sits idle while paperwork remains unresolved.

A short review before you commit

Use a simple checklist when you compare proposals. Keep the answers with the quote, so you can revisit them without relying on a salesperson’s verbal explanation.

• Does the production estimate reflect your roof’s shade, orientation, and usable area?
• Can you identify the utility rate and export-credit assumptions behind the savings forecast?
• Does the written price include permits, electrical work, monitoring, and any roof repairs?
• Have you compared the cash price with the full financed cost and payment schedule?
• Are current incentives verified with their source, eligibility rules, and application deadlines?
• Does the agreement explain warranties, maintenance, ownership, and transfer to a future buyer?

A good proposal should withstand basic questions. The installer should be able to explain the figures, revise assumptions, and distinguish confirmed costs from estimates. If a number changes when you ask how it was calculated, ask for the revised version in writing. That gives you a clearer basis for deciding whether the project fits your budget and your home’s needs.