Dust and dirt on solar panels block sunlight and lower output. Clean them gently with water and a soft brush or cloth, at a cool time of day, and only when it is safe to reach them. Your monitoring app shows when output has dropped enough to need it.
How to clean
- Clean early in the morning or in the evening, when panels are cool and generation is low.
- Rinse with clean water to loosen dust.
- Wipe with a soft brush, sponge or microfibre cloth.
- Rinse again; soft or filtered water avoids hard-water spots.
What to avoid
- Cold water on hot glass in the middle of the day.
- Abrasive pads, harsh detergents or solvents.
- High-pressure jets aimed at the frame edges and junction boxes.
- Standing or walking on panels.
How often?
It depends on local dust, construction nearby, bird activity and rain. Watch your daily generation in the SOLARMAN app: a steady drop on clear days usually means it is time to clean.
Safety first
Work only where you can stand securely, away from roof edges. For hard-to-reach arrays, use a trained cleaning service. Never touch damaged panels or cables.
Also check
Look for new shade (a grown tree, a new tank), loose cables and damaged glass. Report faults to your installer or Tenzor support.
FAQs
Does rain clean solar panels?
It helps, but often leaves a film of dust. Manual cleaning may still be needed in dry seasons.
Will cleaning void my warranty?
Gentle cleaning as described does not. Avoid abrasives and pressure washers, and follow your installer’s advice.