Do solar panel cleaning systems work on all types of panels?

Most solar panel cleaning systems work effectively across standard monocrystalline, polycrystalline, and thin-film panels, as they target surface dirt without damaging the glass or frames. However, compatibility depends on the cleaning method and panel installation specifics, such as roof pitch, accessibility, or fragility.

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Key considerations for UK users

1. Compatibility by panel type

• Standard glass panels (monocrystalline/polycrystalline): Compatible with all major systems (track-based robots, drones, water-fed poles).
• Thin-film panels: Avoid abrasive brushes; use gentler methods like pure water systems or microfiber drone attachments.
• BIPV (building-integrated photovoltaics): May require specialised cleaning to avoid damaging integrated roof materials.

2. UK-specific factors

• Self-cleaning effectiveness: Light rain often suffices for small homes due to the UK’s frequent rainfall, reducing the need for frequent cleaning. However, bird droppings, pollen, or industrial grime may require intervention.
• Roof access challenges: Steep or fragile roofs should use drone-based cleaning (e.g., water-spray drones with brushes) or pure water pole systems (e.g., UNGER’s nLite®), eliminating ladder risks.

3. Recent developments

• Drone advancements: Newer models (2024) combine automatic navigation with soft-bristle brushes, improving safety and efficiency for commercial solar arrays.
• Water-fed systems: Pure water cleaning (chemically free, as used by UNGER) is rising in popularity for its eco-friendly approach and lack of residue.

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Pros and cons of cleaning systems

System Type	Best For	Limitations
Track-based robots	Large commercial arrays	Requires flat, unshaded panels
Drones	Hard-to-reach rooftops	Limited by weather (wind/rain)
Water-fed poles	Residential/small businesses	Requires a pure water source

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Practical advice for UK owners

1. Assess soiling impact first: Most UK households see minimal output loss from dirt, making frequent cleaning unnecessary.
2. Avoid harsh tools: Metal scrapers or high-pressure hoses can scratch panels.
3. Check warranties: Some manufacturers void coverage for damage from unapproved cleaning methods.
4. Prioritise safety: Use certified professionals for steep roofs or complex installations.

Common mistakes:

• Over-cleaning: May wear down anti-reflective coatings.
• Ignoring tilt angle: Flat panels accumulate more debris (e.g., leaves).
• DIY risks: Climbing roofs without safety gear or using acidic cleaners.

For most UK homeowners and small businesses, occasional professional cleaning (every 2–3 years) suffices unless visible grime or output drops exceed 5–10%.