Path-Q Solar

How much production loss can accumulated dirt cause before cleaning is worthwhile?

Answer

Cleaning is worthwhile when the value of the production recovered during the clean panels' useful period exceeds the cleaning cost and risk. The percentage loss varies substantially by dust type, accumulation, rainfall, panel angle, and system value.

Key points

  • There is no reliable universal loss percentage for every property.
  • Compare output with a clean baseline or a comparable unaffected period.
  • Include the expected duration of the improvement, not just the first day's gain.

What it depends on

  • Measured soiling-related loss
  • Electricity value and bill structure
  • Cleaning cost
  • Expected time until the next significant soiling event

Risks and trade-offs

  • Estimated gains may be overstated if weather or shading changed.
  • Frequent cleaning can cost more than the energy recovered.
  • DIY cleaning may introduce equipment, roof, or panel damage risk.

Information you may need

  • Production history
  • Visible soiling and recent weather
  • Cleaning quote or labor cost
  • How recovered energy is valued

Your next step

What to do next

Estimate the likely recovered energy from a clean-versus-soiled comparison and multiply it by its value, then compare that result with the full cleaning cost.

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SQ01046