During a recent residential solar panel cleaning job in Sydney, we noticed something particularly interesting about the distribution of lichen growth across the property’s 40 solar panels.

The difference between the two sides of the roof was remarkable.

• Western roof – 24 panels: Significant lichen growth, with many panels heavily contaminated.
• Eastern roof – 16 panels: Very little lichen, estimated at less than 5% of the contamination observed on the western panels.

Considering all 40 panels were installed on the same property, this was an unusually large difference.

Could the Neighbouring Roofs Be Contributing?

What made this job particularly interesting was the condition of the neighbouring houses.

The house facing the western panels had a roof heavily contaminated with lichen. In contrast, the neighbouring house facing the eastern panels had a remarkably clean roof, with no visible lichen growth.

Was this simply a coincidence, or could there be a connection?

Lichen can spread through airborne spores and microscopic fragments, potentially travelling between neighbouring roofs and solar installations.

It’s possible that the heavily contaminated western roof was contributing to the lichen growth on our customer’s panels.

However, other environmental factors, including prevailing winds, sunlight exposure, moisture retention and surrounding vegetation, can also influence where lichen establishes itself.

While we cannot confirm the neighbouring roof was responsible, the difference certainly raises an interesting question.

Why Lichen Growth Is a Concern for Solar Panel Owners

Lichen is more than an appearance issue.

As it spreads across solar panel glass, it blocks sunlight from reaching the solar cells, potentially reducing electricity generation.

Over time, lichen can become firmly attached to the glass, making removal increasingly difficult.

In some cases, removing established lichen reveals permanent circular marks or surface etching.

Although professional cleaning removes the lichen, it cannot necessarily reverse permanent damage to the glass.

Where etching affects light transmission, some reduction in electricity generation may remain even after cleaning.

This highlights the importance of regular maintenance before heavy lichen growth becomes established.

Watch Our Video – An Interesting Comparison

We’ve produced a short video showing the dramatic difference in lichen growth between the eastern and western solar panels, along with the contrasting conditions of the neighbouring roofs.

Watch the video above to see what we discovered and why the surrounding environment may influence the condition of your solar panels.

Professional Solar Panel Cleaning Across Sydney

At Extra Hand Solar Clean, we use a multi-stage purified water filtration system to clean solar panels without chemicals, detergents, pressure washing or abrasive cleaning methods.

Our cleaning procedures follow manufacturer recommendations and are designed to remove contamination while protecting the glass surface.

Based in Miranda, we provide professional solar panel cleaning throughout the Sutherland Shire, Sydney’s southern suburbs and greater Sydney metropolitan area.

Don’t wait until lichen becomes firmly established and potentially causes permanent damage to your solar panels.

Contact Extra Hand Solar Clean for a free, no-obligation quotation.

📞 Call or message 0403 555 570 today to discuss the right approach for your roof and solar panels

Learn more about our solar cleaning and contact us today.