Path-Q Solar

What production change would justify inspecting panels after nearby construction creates new dust?

Answer

There is no universal percentage threshold. Inspection is justified when visible dust is substantial, production falls relative to weather-adjusted expectations, the decline persists across comparable periods, or dust may have entered connectors, vents, or other equipment. Compare the system with a clean baseline and consider the cost and safety of inspection or cleaning.

Key points

  • Use irradiance, temperature, shading, and system availability to separate dust effects from weather or faults.
  • A brief drop after a dusty event may be normal; a persistent or uneven drop is more concerning.
  • Inspect for deposits, cement or construction residue, blocked drainage, and debris around equipment.
  • Construction may create new shading, vibration, physical damage, or airborne material beyond ordinary soiling.

What it depends on

  • Dust type, thickness, duration, and rainfall
  • Panel tilt, local wind, and construction proximity
  • Production monitoring quality
  • Cleaning and inspection cost and access safety

Risks and trade-offs

  • Cleaning too early or too often may cost more than recovered production.
  • Construction residue can bond to surfaces and become harder to remove.
  • Roof access or improper cleaning can create greater damage than the soiling itself.

Information you may need

  • Pre-construction baseline and post-event production
  • Construction dates, materials, and dust-control measures
  • Photos of panels and equipment from safe locations
  • Weather, rainfall, shading, and cleaning history

Your next step

What to do next

Document the dust event and compare weather-adjusted output; obtain a qualified inspection if the decline persists or residue appears difficult to remove.

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SQ02140