Path-Q Solar

What types of dirt or debris cause the greatest solar production losses?

Answer

The greatest losses usually come from persistent, opaque, or uneven deposits that block light, such as bird droppings, leaves, pollen, dust, ash, mud, and industrial or agricultural residue. The impact depends on the amount, location, rainfall, panel angle, and whether deposits create localized shading.

Key points

  • Small amounts of hard-to-remove or opaque material can matter more than an even thin dust layer.
  • Bird droppings and leaves can create localized hot spots or disproportionate shading.
  • Dust, pollen, ash, and pollution may accumulate where rain does not wash effectively.
  • Cleaning needs should be based on observed soiling and production impact, not a fixed schedule alone.

What it depends on

  • Local environment and nearby sources of dust or debris
  • Panel tilt, drainage, and rainfall
  • Soiling distribution across the array
  • System monitoring and cleaning access

Risks and trade-offs

  • Unsafe roof access can make do-it-yourself cleaning more hazardous than the energy loss.
  • Aggressive cleaning or abrasive tools can damage glass, coatings, seals, or frames.
  • Frequent professional cleaning may cost more than the recovered production.

Information you may need

  • Photos or inspection results
  • Panel location and access conditions
  • Production before and after cleaning
  • Local soiling pattern and rainfall

Your next step

What to do next

Inspect the array from a safe location, compare affected strings or periods in the monitoring data, and estimate whether cleaning would recover meaningful output.

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SQ00625