Path-Q Solar

When should I ask for a revised production estimate after nearby construction changes the shading pattern?

Answer

Ask for a revised estimate as soon as construction creates a reasonably permanent change in shading or is expected to remain during the system’s operating period. Do not wait for a full year of data if the physical obstruction can already be measured or modeled.

Key points

  • Document the obstruction’s height, location, orientation, and expected permanence.
  • Request updated shade analysis for each affected roof section and season.
  • Compare the revised estimate with the original assumptions and contract promises.
  • Review whether panel relocation, trimming, design changes, or monitoring is appropriate.

What it depends on

  • Construction height, distance, orientation, and completion status
  • The system’s layout and the timing of shading
  • Quality of the installer’s shade model and available site measurements

Risks and trade-offs

  • A temporary construction shadow may not justify a permanent redesign.
  • A permanent obstruction can reduce production and change the economic case.
  • Relocation may improve production but involve roof work, access, and added cost.

Information you may need

  • Before-and-after photographs or surveys
  • Construction plans and expected completion date
  • Original shade analysis and production estimate
  • Current monitoring data, if available

Your next step

What to do next

Send the installer documented evidence of the changed shading and request a revised, assumption-labeled production model.

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