Dirty solar panels are costing you power

Solar panels are built to sit outside and take a beating, so it's easy to assume they're maintenance-free once installed. In practice, a layer of dust, pollen, bird droppings and general grime builds up over time, and that layer sits directly between your panels and the sunlight they're meant to convert into power.

How much does dirt actually cost you?

Studies on solar output consistently show that heavily soiled panels can lose a meaningful share of their generating capacity, with even light dust causing a measurable dip. On a typical residential system, that's real money left on the table every quarter, often more than the cost of getting the panels cleaned.

Why South East Queensland panels get dirty faster

A few local factors make regular cleaning more important here than in drier climates:

• High humidity and rain create the right conditions for algae and mould growth on panel surfaces
• Pollen season leaves a fine, sticky film that plain rain often can't rinse off
• Properties near the coast pick up salt residue, which is more corrosive if left to sit
• Bird activity around rooftop panels is common in suburban areas

How often should you clean them?

For most homes, once or twice a year is enough to protect performance. If your property is near trees, the coast or a busy road, every six months is a safer schedule. Commercial and strata solar arrays, especially larger installations, often benefit from a quarterly clean given the scale of output involved.

Why it's not a DIY job

Panels are wired, elevated and easy to scratch with the wrong equipment. A stiff brush or the wrong pressure setting can cause micro-scratches that reduce efficiency permanently, and rooftop work carries obvious fall risk. We use soft-bristle tools and purified, low-mineral water so panels dry without streaking or leaving residue, applied safely from proper roof access equipment.

A clean panel is a panel doing its job. If it's been more than a year since yours were cleaned, it's worth checking.