"When should I clean my solar panels?" — one of the most common questions across our 160+ PV projects. The right answer isn't a single number; it depends on location, season and the environmental conditions the panels face.
Quick answer: frequency by region
- Desert and semi-arid (Konya, Karaman, Şanlıurfa, MENA region): every 15-20 days
- Industrial zones and OSBs: every 20-30 days
- Agricultural areas (harvest season): weekly during harvest, monthly otherwise
- Coastal regions (Mersin, Antalya, İzmir, Mediterranean coast): every 1-2 months — salt-air vs. rain balance
- High-rainfall regions (Black Sea): every 2-3 months, spot cleaning during dry spells
- Rooftop PV (city centers): monthly (bird droppings, pollen, exhaust residue concentrated)
4 factors that drive frequency
1) Rainfall frequency
Rain partly removes loose dust but leaves sticky residue. Cleaning is essential after a 4-week dry spell. Robotic cleaning is critical in low-rainfall regions.
2) Air quality and pollution
Sites near factories, highways or construction soil faster. Industrial residues can be acidic; left on the panel they cause permanent marks and erosion.
3) Seasonal factors
- Spring: high pollen — weekly cleaning may be needed.
- Summer: dryness + dust; frequent cleaning is essential.
- Autumn: leaves and organic residue; weekly inspection.
- Winter: if snow removal is needed, use proper equipment (hot panel + cold snow causes thermal shock; be careful).
4) Yield-loss threshold
5% yield loss is the typical cleaning trigger. If your site has inverter / production monitoring, watch the gap between historical clean-panel output and current output. We integrate production-loss dashboards with our customers' systems.
Over-cleaning is also a problem
"I bought a robot, I'll clean daily" isn't right either. Overly frequent (weekly) cleaning gradually wears the anti-reflective coating. The optimal frequency sits between soiling rate and panel surface durability.
Site-specific maintenance schedules
We prepare an annual maintenance schedule for our customers — using your site geography, panel count and historical production to set how many cleanings per month; we generate the field schedule for your robot. This maximizes ROI.