What a good solar quote should show
A useful quote is readable and itemized. It should list the proposed system size (in kilowatts), an estimate of annual energy production with the assumptions used, the panel and inverter models, mounting method, all material and labor costs, estimated permit and inspection fees, and an expected timeline. It should also state who provides equipment and workmanship warranties and whether monitoring or maintenance is included. If a financing offer is shown, the quote should state the terms or link to the paperwork. Remember: amounts and availability depend on your location, roof condition, utility rates, and financing choices.
How system size and production affect price
Two different quotes can have the same kW size but very different expected output, and that changes value. System size (kW) is a starting point, but production depends on roof orientation, tilt, shading, local sunlight, and panel efficiency. Ask for the estimated annual kilowatt-hours and the modeling assumptions, such as tilt and shading. Also check whether the installer sized the system to match current bills or to offset a percentage of usage—those goals change the quote. Pricing will reflect the total installed capacity, the expected production, and any added components like batteries or upgraded racking.
Equipment, warranties, and who answers service calls
Compare not just brand names but responsibility. Panels and inverters differ by efficiency and cost; microinverters and optimizers add hardware and change the way failures are handled. Warranties matter, but two warranty statements aren’t identical: ask who is the warranty issuer and who you call if something goes wrong. National brands such as SunPower, Tesla Energy Solar, and Sunrun may offer standardized packages and a larger service network, which can help for remote support or large warranty claims. Local installers often provide more hands-on service, quicker site visits, and local code familiarity. Tradeoffs include consistency versus personalization, and potentially different price points and response times. Always confirm which company is legally responsible for workmanship and how warranty claims are processed.
How to compare quotes — a practical checklist
Use this checklist to make quotes comparable: - Same production target: ask each company to size to the same annual kWh or to cover the same share of your bill. - Same assumptions: confirm tilt, azimuth, and shading inputs used in production estimates. - Itemized equipment and labor: panel model, inverter type, mounting, and monitoring. - Timeline and milestones: design approval, permitting, installation, inspection, and interconnection. - Warranties and who backs them: equipment versus workmanship and the claimant contact. - Financing and incentives: include any loan, lease, or PPA terms and note whether federal or local incentives are applied to the total. - Maintenance and monitoring: what's included and what costs extra. Comparing these line by line makes it easier to see where one quote differs and why.