The greatest factors that contribute to dust build-up are your geographical location and the surrounding elements that might pollute your system. Canberra is a growing city with a lot of housing and commercial developments going ahead. Whole suburbs are being built in literally 12 months.
While heavy rain, as some smaller studies suggest, might help to clean, and clear debris and pollutants from your panels, most large studies report that dust build-up can lower the efficiency of our system in just a minute – around 5% or less.
One study found that solar panels that are properly maintained perform 3.5% more efficiently. CleanTechnica reported an analysis, gathered by the US National Renewable Energy Laboratory (NREL), that panels lose around 30% if not cleaned properly.