Path-Q Solar

What should I do if an installer will not provide a detailed production model?

Answer

Ask for the assumptions and an output estimate detailed enough to evaluate orientation, shading, equipment limits, losses, degradation, and uncertainty. If the installer will not provide meaningful assumptions or a comparable model, treat the quote as less transparent, seek another proposal, and avoid relying on an unsupported production promise.

Key points

  • The model should identify array layout, orientation, tilt, shading, system size, inverter limits, and major loss assumptions.
  • Request production by month or another defined interval and clarify whether the estimate is gross, net, or otherwise adjusted.
  • A model is an estimate, not a guarantee; its value depends on the quality of inputs and stated uncertainty.

What it depends on

  • Complexity of the site and shading
  • Purpose of the estimate, such as comparison or financing
  • Whether the contract includes a measurable production commitment
  • Availability of site measurements and design documents

Risks and trade-offs

  • Rejecting a quote solely because its software format differs may overlook a sound design if assumptions are clearly documented.
  • Accepting an opaque estimate makes proposals and later performance disputes harder to evaluate.

Information you may need

  • Proposed layout and equipment
  • Shading and site assumptions
  • Monthly or interval production estimate
  • Treatment of losses, degradation, and uncertainty

Your next step

What to do next

Send the installer a written request for the model inputs, output table, and exclusions; if it declines, obtain a comparable quote from another installer.

Path-Q

Find the right next step

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

Loading…

SQ02347