Solar Panel Cleaning in Gauteng

Why dirty panels produce less

Dirt on the glass blocks and scatters sunlight before it reaches the solar cells. An even film of dust lowers output across the whole panel, while concentrated dirt, like a bird dropping, shades individual cells. Because cells are wired in series, one shaded patch can pull down more than the cell it covers.

The loss is easy to miss. The system keeps working, just below its potential, so it often goes unnoticed until you compare the output with last year's figures for the same season.

How often should solar panels be cleaned?

There's no single answer. It depends on how dusty your area is, the tilt of your panels, whether there are gravel roads, construction or farmland nearby, and how many birds visit your roof.

In Gauteng, the dry season from roughly May to September lets dust build up with no rain to rinse it away, and the first summer storms can leave muddy residue behind rather than a clean finish. Scheduled maintenance takes the guesswork out: we agree a cleaning interval that suits your site.

Signs your panels need a clean

• Visible dust, film or streaks on the glass
• Bird droppings, leaves or debris on the panels
• Lower output on clear days than at the same time last year (your inverter app will show it)
• It's been months since the last clean, or they've never been cleaned

Why not clean them yourself?

You can, but working on a roof is dangerous without the right equipment, and abrasive pads, harsh detergents or high-pressure water can damage the glass and its coating. If you do it yourself, follow your panel manufacturer's cleaning guidance first.