What instant quotes usually show
Most instant quotes give a few core items: an estimated system size based on your location and energy use, a rough price or price range, and a projected energy production. Some tools also show assumed panel counts, a basic layout from satellite images, and estimated monthly or annual offset. Major providers like Tesla Energy Solar, Sunrun, and Palmetto Solar offer web tools that vary in how much they rely on automated data versus human review.
Why these estimates can be off
Automated quotes depend on limited inputs. Satellite imagery can’t reveal roof age, decking condition, or recent tree growth that creates shading. They usually don’t account for hidden costs like structural reinforcements, permit or inspection fees, local utility interconnection charges, or required electrical panel upgrades. Incentives and net metering rules also vary by utility and can affect project value. Finally, assumptions about panel model, inverter type, and labor are often generic — and those choices change cost and performance.
How to judge an instant quote’s reliability
Check the assumptions behind the estimate: what panel and inverter brands are used, whether roof work or permits are included, and whether the production estimate uses your actual utility rates. Get multiple instant quotes from different providers to spot outliers. If a quote doesn’t list basic assumptions, ask the company for clarification. Use instant quotes to narrow down who you want to talk to, but plan to get a written, site-verified estimate before committing.
Questions to ask before requesting a firm quote
When you move from an instant estimate to a formal proposal, ask: Does the price include permits, inspections, and interconnection fees? Which specific panels and inverters will be used, and are those models included in the price? Will the installer assess roof condition and factor in any repairs? Are labor and performance warranties documented in writing? What financing choices are available and how do they change the out-of-pocket cost? Who will be the local installer responsible for the work? Asking these helps reveal where the instant estimate might change.