A coastal address is good for solar yield and hard on the panels themselves. In Maroubra a salt haze settles on the glass and binds airborne sand and dust into a film that rain does not fully clear. It is invisible from the ground and quietly costs you output every month.
Maroubra gets excellent sun, which is why so many roofs here carry an array. The catch is that the same onshore wind delivering that clear coastal light also carries salt and fine beach sand onto the glass.
Salt film is the specific problem. Unlike ordinary dust, it is hygroscopic, so it draws moisture out of the air and stays slightly damp, which lets sand and pollen bond to the panel surface rather than blowing off. Rain rinses the loose material but leaves the bonded layer behind, and because it builds evenly across the array there is no obvious dirty patch to alert you. Output simply drifts down.
The foreshore also brings gulls, and droppings are the other regular issue here. A single dropping shading one cell can drag down the string it sits in, out of proportion to the area covered. Pine needle litter collecting along the lower panel edges holds moisture against the frame as well.
We clean with purified water and a soft brush, no detergent and no abrasives, working from roof ladders and height-safety gear rather than walking the array. Purified water leaves no mineral spotting as it dries.
Solar is one of the few exterior services where the return is measurable. You can see it on your inverter app.
The value proposition in Maroubra is straightforward: you paid for a system rated at a certain output, and a salt-bonded film across the glass means you are not getting it. Because the loss is gradual and even across the array, almost nobody notices it happening. Owners here routinely discover they have been running well below capacity for years.
The financial case follows from that. A system generating meaningfully less than it should is extending its own payback period every month, and for anyone exporting to the grid it is straightforward lost income.
There is a hardware argument too. Salt and grit held permanently against the panel frame and seals works at both over time, and bird droppings left to bake on can etch the glass surface. Neither is covered by a performance warranty that assumes reasonable maintenance.
Cleaning with purified water and no detergent matters because it leaves nothing on the glass for salt to key into, so the result holds longer in a coastal position.
Mostly a salt film carried in on the onshore wind, mixed with fine beach sand and pollen. Salt draws moisture from the air and stays slightly damp, so the sand bonds to the glass instead of blowing off. Rain removes the loose material but leaves the bonded layer behind.
Check your inverter app. Solar is one of the few exterior services with a measurable result, so comparing generation before and after a clean shows what the salt film was costing. Because the loss builds gradually and evenly, many owners don't notice it until they see the numbers. Before-and-after photos show the glass itself.
Coastal arrays generally need more attention. Salt and sand arrive with every onshore wind, gulls from the foreshore leave droppings that can drag down a whole string, and pine needles collect along the lower panel edges. Droppings left too long can bake on and etch the glass.
Salt and grit held against the frame and seals work at both over time, and pine needle litter along the lower edges keeps them damp. Clearing that material and rinsing with purified water, which leaves nothing for salt to key into, helps the clean hold longer in a coastal position. The team works from roof ladders and height-safety gear.
How we clean arrays with purified water and no detergent, and why output recovers once the glass is clear.
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WEDNESDAY: 7:30 AM — 6:00 PM
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SATURDAY: CLOSED
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