Dust, bird droppings, pollen, and agricultural residues can reduce photovoltaic (PV) module output and create hot spots that shorten equipment life. For industrial buyers in Latin America—where the Atacama Desert, Andean dust, coastal salt, and tropical bird populations create distinct soiling profiles—a documented cleaning plan is a procurement asset, not just a maintenance task. This guide outlines how to specify, source, and support a solar module cleaning program that meets operational, safety, and import requirements.
Start by characterizing your site: soiling type (mineral dust, organic droppings, salt), tilt angle, rainfall patterns, water availability, and module technology (framed glass-glass or glass-backsheet). Bird droppings are highly localized and corrosive; they require targeted removal rather than whole-array washing. Dust is often uniform and can be managed with scheduled dry or wet cleaning. The plan should define trigger thresholds—for example, a measured transmittance loss or a visual inspection score—rather than fixed calendar dates alone, because cleaning too often wastes water and labor, while cleaning too late risks permanent staining and hot spots.
Equipment selection should match the site's water and labor constraints. Options include telescopic water-fed poles with soft brushes, semi-automated rail-mounted cleaners, and fully autonomous robots for large utility-scale arrays. For dry, dusty regions, waterless microfibre systems reduce water logistics; for coastal or agricultural sites, low-pressure water with approved cleaning agents is common. Always verify that brushes and chemicals are compatible with the module manufacturer's warranty terms and with the anti-reflective coating.
| Element | Specification / Consideration | Procurement / Compliance Note |
|---|
| Soiling assessment | Visual inspection, transmittance loss measurement, drone imaging | Document baseline for O&M contracts; use for cleaning triggers |
| Cleaning method | Dry brush, water-fed pole, semi-automated rail, autonomous robot | Confirm compatibility with module warranty and coating |
| Water quality | Low mineral content; avoid hard water spotting | On-site filtration or delivered demineralized water may be required |
| Cleaning agents | pH-neutral, biodegradable, residue-free | Check module maker's approved chemical list; avoid abrasives |
| Safety | Fall protection, electrical isolation, DC arc risk, heat stress | Follow local labor and electrical safety regulations; train crews |
| Schedule | Seasonal plan plus event-based cleaning after dust storms or nesting | Align with rainy/dry seasons and bird nesting cycles |
| Spare parts | Brushes, hoses, pumps, batteries, robot wheels | Prefer suppliers with regional spare-part stock or DDP options |
| Documentation | Cleaning logs, photos, water usage, chemical safety data sheets | Supports warranty claims and ESG reporting |
| Supplier profile | Manufacturer or authorized distributor with export experience | Request test reports, warranty terms, and references in Latin America |
| Logistics | Incoterms, HS codes, customs brokerage, port handling | Confirm duties, taxes, and import licensing for your country |
Compliance and safety are non-negotiable. Cleaning crews should work under a lockout/tagout procedure for the DC side, use insulated tools, and follow local occupational health rules for heat and height. Where cleaning agents are imported, ensure safety data sheets (SDS) are available in Spanish or Portuguese, and verify that chemicals are permitted for use near watercourses or protected areas. For utility-scale plants, check whether environmental permits restrict water use or discharge.
Logistics planning for Latin American importers should address port congestion, customs valuation, and inland transport. Buyers commonly use FOB or CIF for sea freight, then arrange local customs clearance; DDP can simplify delivery but shifts risk to the supplier. Confirm HS codes for cleaning equipment and chemicals, and verify whether your country requires product registration for biocides or detergents. For robotic cleaners, check radio-frequency and electrical certification requirements.
Supplier selection should go beyond price. Ask for: (1) proven installations in similar climates; (2) availability of spare parts and technical support in your region; (3) warranty terms for motors, pumps, and batteries; (4) training materials in Spanish or Portuguese; and (5) references from existing B2B customers. A supplier with a local distributor or service partner can reduce downtime and simplify after-sales support. Where possible, negotiate a pilot deployment before full-scale procurement.
Finally, integrate the cleaning plan into your O&M contract. Define key performance indicators such as cleaning frequency, water consumption per MW, response time for bird-dropping removal, and reporting. Review the plan annually against actual soiling data and adjust schedules, equipment, and chemical use. A well-structured procurement and maintenance strategy protects energy yield, extends module life, and supports long-term project bankability in Latin America's growing solar market.
This article is reposted for informational purposes only. The views expressed are those of the original author and do not represent PairBiz. Stay tuned for more updates.
