Path-Q Solar

What should I do if the installed solar system is smaller than the signed quote?

Answer

Stop treating the project as complete, document the difference, and compare the installed system with the signed contract, approved change orders, and final design. Ask the installer in writing to explain the discrepancy and either deliver the contracted scope, obtain your written agreement to a properly priced change, or provide the remedy required by the contract and applicable law.

Key points

  • Compare panel count, panel model, total nameplate capacity, inverter capacity, battery capacity, and any promised production or structural work.
  • Photograph labels, equipment, roof layout, and relevant paperwork without disturbing the system.
  • Do not sign an unconditional completion certificate or make a disputed final payment before the issue is resolved.
  • A smaller system may affect production, financing, warranties, incentives, and the project's expected economics.

What it depends on

  • The exact signed scope and whether the quote was amended
  • Whether the installed equipment is safe, permitted, and operational
  • The payment, warranty, dispute, and cancellation provisions in the contract

Risks and trade-offs

  • Accepting a reduced system may lower output and undermine the original financial assumptions.
  • Withholding payment improperly can create contract or financing consequences, so the disputed amount and contract procedure matter.
  • Replacing equipment or expanding the system may require new engineering, permits, inspections, or utility approval.

Information you may need

  • Signed contract, proposal, site plan, and change orders
  • Installed equipment list and photographs of model and serial labels
  • Inspection, commissioning, and interconnection status
  • Any financing or incentive documents tied to system size

Your next step

What to do next

Send a written discrepancy notice with the contract and installation evidence, request a corrective plan and deadline, and obtain independent technical or legal advice before signing acceptance if the installer disputes the issue.

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SQ00995