Path-Q Solar
How many solar quotes are enough to identify an unusual price or system design?
Answer
There is no universal number, but comparing about three genuinely comparable proposals is often enough to identify an outlier in price, system size, production estimate, or scope. More quotes can help when proposals conflict or the property is unusual, but quality and comparability matter more than count.
Key points
- Request the same information from each installer: system size, expected production, equipment, scope, warranties, exclusions, and total price.
- Normalize differences in roof work, electrical upgrades, monitoring, storage, and other included items before comparing price.
- Investigate any proposal that is materially cheaper, more expensive, larger, smaller, or more optimistic than the others.
- A low price may reflect omitted work, lower-quality equipment, different warranty support, or a smaller scope.
- A high price may include legitimate structural, electrical, access, or roof-related work.
What it depends on
- How comparable the proposals are
- Property complexity and regional installer availability
- Whether the proposals use consistent production and cost assumptions
- The quality of each installer's site assessment
Risks and trade-offs
- Collecting many quotes can create confusion and encourage comparison based only on price.
- Several installers may repeat the same mistaken assumption.
- An unusual design may be justified by site constraints rather than being incorrect.
Information you may need
- At least two or three complete proposals
- Detailed scope, equipment, production, warranty, and price information
- Roof and electrical condition
- Clarification of all differences between proposals
Your next step
What to do next
Build a side-by-side comparison of three proposals and ask each installer to explain any material outlier before seeking additional opinions.
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