Solar Panel Cleaning in Strathfield

Strathfield is an unusual solar environment. There is no coastal salt and comparatively little of the constant organic litter that defines the leafy northern suburbs. What there is instead is traffic particulate.

Soot and brake dust from the major road and rail corridors bounding the suburb settle as a fine, slightly greasy film that bonds to glass more stubbornly than dry dust. Rain does not clear it properly, it streaks it. Because the deposit is even across every panel there is no visual cue at all, which is why arrays here commonly run well below their rated output for years without anyone noticing anything wrong.

Autumn brings the second issue. The plane trees and camphor laurels that line these streets drop broad, flat leaves that land on panels and stay there, holding moisture against the glass and leaching tannin as they break down. On a low-pitch array they will not slide off.

Because cells run in series within each panel, a strip of leaf across the lower edge of a row constrains the whole string rather than costing a proportional share.

We clean with purified water and a soft brush, no detergent, working from ladders and height-safety gear rather than walking the array.

Of all the suburbs we service, Strathfield is where solar owners are least likely to realise anything is wrong.

There is no dramatic leaf fall on the panels for most of the year and no coastal salt, so the array looks fine from the ground. What it is carrying instead is a fine, slightly greasy traffic film that dulls the glass uniformly. Uniform loss produces no visible symptom at all, which is why systems here can run below rated output for years without prompting a single question.

The benefit of cleaning is therefore mostly a discovery: owners frequently find their generation figures step up noticeably afterwards, having assumed the system had simply aged.

The greasy nature of the deposit is why it needs proper cleaning rather than rain. Rain streaks a film like this rather than clearing it, and a streaked panel can shade unevenly, which interacts badly with series-wired cells.

Autumn adds a second, more obvious problem when broad deciduous leaf lands and stays on low-pitch arrays.

Purified water leaves no residue for the film to re-key into.