Is it necessary to shut down my solar power system while cleaning the panels?

No, professional solar panel cleaners in the UK generally recommend keeping the system operational during routine cleaning, provided safe methods and equipment are used. Unnecessary shutdowns reduce energy production and are typically avoidable with proper precautions.

Key considerations for safe cleaning

Electrical safety

• Daytime cleaning poses low risk: Modern grid-tied systems automatically reduce voltage to safer levels when inverters are operating normally.
• Managing voltage: Some large commercial systems may isolate sections, but residential setups rarely require full shutdowns if professionals use insulated tools and pure water systems.

Cleaning system options

• Pure water filtration (e.g., UNGER nLite® systems): Use filters to avoid chemicals and reduce risks by preventing conductive contaminants[^1].
• Robotic cleaners (e.g., BeBa Energy’s radio-controlled units): Limit human contact with live systems while cleaning[^2].
• Water-fed poles: Telescopic brushes with deionised water (common in UK services) allow ground-based cleaning without roof access[^3].

Practical advice for UK users

• Professional services: Opt for SMAS-accredited or Safe Contractor-registered cleaners (standard among UK specialists like Solar Panel Cleaning Services Ltd) for guaranteed safety protocols[^4].
• DIY precautions: If cleaning yourself, follow manufacturer-approved methods only. Avoid abrasive tools, high-pressure jets, or harsh chemicals that void warranties.
• Timing: Clean early morning or evening in summer to avoid rapid drying streaks.

Common mistakes

❌ Unnecessary shutdowns: Costs ~£15-50/day in lost generation for average UK home systems (4kW).
❌ Using hard water: Causes mineral deposits that attract dirt.
❌ Neglecting angle: Steeper roofs (common in UK) need longer poles or robotic solutions to avoid unsafe access.

Recent UK developments

The 2023 Fire Safety Act guidance emphasises maintaining PV system cleanliness without damaging the roof, particularly for commercial buildings. Robotic cleaning adoption has increased among UK solar farms due to labour shortages and safety requirements.

^1^ Common in systems by UNGER and Xline suppliers
^2^ Used by UK specialists like BeBa Energy
^3^ Standard for most UK residential services
^4^ As used by industry leaders like Solar Panel Cleaning Services Ltd