How to Compare Two Solar Quotes
Two solar quotes at the "same price" can be very different. A fair comparison looks at more than price — it lines up the system size, production estimate, equipment, warranty, and contract terms side by side.
Last updated 2026-08-19
Line these up side by side
| Factor | Quote A | Quote B |
|---|---|---|
| System size (kW) | ||
| Panel count | ||
| Panel wattage (each) | ||
| Annual production (kWh) | ||
| Total price | ||
| Price per watt | ||
| Financing structure | ||
| Dealer / financing costs (where disclosed) | ||
| Equipment — panel make/model | ||
| Equipment — inverter type | ||
| Warranty terms | ||
| Labor coverage | ||
| Roof penetration coverage | ||
| Production assumptions / shading | ||
| Installer history |
Production is the moving number
Where quotes commonly differ
- Production estimates — Higher isn't automatically better; it may be optimistic modeling.
- Equipment — Different panel and inverter brands perform and warranty differently.
- Warranty and labor coverage — The single biggest hidden difference. Two "25-year warranties" can cover very different things.
- Financing costs — Dealer fees and interest can quietly shift the real cost of a $0-down offer.
- Roof coverage — Does the workmanship warranty cover roof penetrations and leaks? Get it in writing.
Price per watt — useful but not everything
Price per watt (total price ÷ system watts) normalizes quotes of different sizes. But it only tells you anything when the equipment and warranty terms are comparable. A lower price per watt with cheaper equipment and weaker labor coverage is not a better deal — it's a different deal.
Installer history
A 25-year warranty from an installer won't matter if they're not around in year 10. Look at how long the company has been operating, whether they use employees or subs, and whether they'll service the system after the install. See Questions to Ask a Solar Company.
Next step
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Send it to Charles for help understanding the design and production estimate.
About Charles Brogden
Charles Brogden works directly with homeowners through AllSeason Solar & Roofing, helping customers understand solar system design, equipment, roofing considerations and available solar options.
Serving homeowners throughout New Jersey and Pennsylvania.