Path-Q Solar

What next step is appropriate if a solar quote does not show the assumptions behind its production estimate?

Answer

Ask the installer for a written production model and its assumptions before comparing or accepting the quote. The model should explain system layout, orientation, tilt, shading, losses, weather basis, degradation, and any limits or exclusions affecting the estimate.

Key points

  • A production number is not comparable unless the modeled system size, location, layout, and loss assumptions are clear.
  • Ask whether the estimate is annual, monthly, or based on a specific weather dataset or scenario.
  • Request sensitivity information for shading, soiling, snow, equipment availability, and future changes.

What it depends on

  • Site layout and shading analysis
  • Module, inverter, and system configuration
  • Modeling method and loss assumptions
  • Whether the quote includes a performance commitment or only an estimate

Risks and trade-offs

  • A precise-looking estimate can create false confidence when inputs are undisclosed.
  • More conservative assumptions may lower the estimate but improve comparability and planning.
  • Different modeling tools can produce different results even with similar system designs.

Information you may need

  • Complete proposal and system design
  • Production-model report or assumptions sheet
  • Shading and roof-layout analysis
  • Expected degradation and loss assumptions

Your next step

What to do next

Request the missing assumptions in writing and obtain at least one comparable quote using the same site and modeling inputs.

Path-Q

Find the right next step

Answer a few questions and we’ll narrow your options.

Loading…

SQ02823