Path-Q Solar

How many quotes should I obtain when each installer uses a different design approach?

Answer

Obtain enough proposals to compare at least two or three credible approaches, but focus on comparable scope and assumptions rather than a fixed number. If designs differ substantially, ask providers to explain the difference or prepare a common alternative before choosing.

Key points

  • Compare system size, modeled production, layout, equipment, warranties, exclusions, schedule, and total scope.
  • A larger number of quotes is less useful if each uses different shading, consumption, degradation, or pricing assumptions.
  • Include providers capable of explaining roof, electrical, structural, and maintenance implications.
  • Do not select solely by lowest price or highest modeled production.

What it depends on

  • Complexity and value of the project
  • How materially the designs differ
  • Availability of qualified providers
  • Your ability to normalize assumptions

Risks and trade-offs

  • Too few quotes can hide weak assumptions or an uncompetitive scope.
  • Too many can create confusion and encourage superficial price comparison.
  • A technically better design may cost more or produce less modeled energy for valid reasons.

Information you may need

  • A consistent request-for-proposal scope
  • Designs, production assumptions, and equipment lists
  • Warranties, exclusions, and maintenance terms
  • Your priorities and site constraints

Your next step

What to do next

Create a comparison table and obtain roughly two or three detailed proposals, requesting clarification or a normalized alternative wherever the designs are not directly comparable.

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