Dirty panels can lose 5–25% of their output. A proper clean is one of the cheapest ways to get that production back.
Hunter Valley solar panels see a lot — bird droppings, pollen from the surrounding vineyards and bushland, dust from harvests, summer storms that leave grit behind. Rain helps, but it doesn't clear baked-on bird waste or the lichen that creeps in under panel edges. After a year or two, you can be losing real money without realising it.
What's actually happening to dirty panels
Independent studies put typical soiling losses at around 5%, rising to as much as 25% in agricultural or coastal areas with heavy bird activity. On a 10 kW system, that can be hundreds of dollars a year in lost generation.
Bird droppings and lichen create shaded patches that force individual cells to dissipate the current the rest of the panel is producing — as heat. Long-term, that causes permanent cell damage and warranty disputes.
Many panel manufacturers expect panels to be kept reasonably clean and maintained — and a regular cleaning record helps if you ever need to make a warranty claim.
This is not a job for a homeowner with a garden hose and a ladder. Wet panels are slippery, and a fall from a roof is serious — it's worth leaving to someone who does it for a living.
A sensible cycle for Hunter Valley conditions
For most Hunter Valley homes, every 12–24 months keeps panels close to factory-clean. Properties near vineyards, bushland, or with heavy bird traffic should aim for annual cleans. Coastal homes (salt deposit) and farm properties (dust + droppings) benefit from twice-yearly cleans.
If you're due for an annual service, it's typically cheaper to do the clean at the same time — we're already on the roof. See system servicing →
We supply and install solar panel cleaning across the Hunter Valley (Cessnock, Kurri Kurri, Maitland, Singleton and Muswellbrook), Newcastle, the Central Coast and the Central West around Mudgee, Bathurst, Orange and Dubbo. Choose your area to see what we typically do there.
Somewhere else? See all the areas we cover or just ask.
