How often should you clean your solar panels?
Getting the cleaning frequency right matters for the overall economics of your installation. Leave it too long and output drops; over-clean and you're not adding any value. So what's the right cycle across the UK?
For most residential and commercial installations in urban or suburban areas, a schedule of two cleans a year remains the recommended standard for protecting your investment.
The environmental factors that change the rules
Every location has its own risk factors. Here are the key ones worth paying closer attention to:
- Proximity to farmland: ploughing and harvest periods generate large amounts of soil dust that settles on roofs.
- Tree-lined areas: spring pollen and decomposing leaves form a very opaque organic layer.
- Near busy roads: fine particulates from traffic create a greasy film that rain alone struggles to shift.
- Industrial settings: fine particulate emissions can call for up to three visits a year.
Is your installation producing at its full potential?
Don't let airborne grime eat into your return on investment. Request a free diagnostic and we'll plan a visit using pure demineralised water.
The ideal schedule
To get the most out of each visit, VoltFarm recommends two key windows:
1. Early spring (March-April): to clear winter residue and prepare the modules to capture peak summer sunlight.
2. Late autumn (November): right after leaf fall and the last pollen peaks, to stop deposits setting on the glass over winter.
5 warning signs not to ignore
- A visible drop in output on your inverter's monitoring app.
- Visible bird droppings or moss on the frames.
- A whitish limescale deposit after rain followed by sun.
- Panels positioned under deciduous trees or power lines.
- No professional maintenance for over 24 months.