Path-Q Solar

How many installer proposals should I compare when the designs use different assumptions?

Answer

There is no fixed ideal number; compare enough proposals to identify whether differences come from design assumptions rather than provider quality. A practical approach is to obtain several comparable proposals, then normalize system size, production, equipment, scope, warranties, and financial assumptions before choosing.

Key points

  • More proposals are not useful if each uses different inputs and omissions.
  • Request a common assumptions sheet or ask providers to reprice a defined scope.
  • Compare expected production and total installed scope, not only panel count or headline price.

What it depends on

  • Completeness and comparability of proposals
  • Property complexity
  • Differences in equipment and design architecture
  • Clarity of production, warranty, and contract terms

Risks and trade-offs

  • The lowest price may exclude necessary electrical, roof, permit, or monitoring work.
  • A larger system may appear better without delivering proportionate value.
  • Too many inconsistent proposals can create confusion instead of confidence.

Information you may need

  • System size, layout, and production assumptions
  • Equipment models and warranties
  • Complete scope, exclusions, and payment terms
  • Current bill and future-load assumptions

Your next step

What to do next

Select the strongest comparable proposals and ask each provider to complete the same comparison table before evaluating price or savings.

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