How do you know your panels are giving you the best return? Are you getting the full, rated output – and the financial benefits?
Overseas studies have shown that without regular heavy rain, you can be losing more than 30% of nominal output.
You shouldn't be surprised: how often do you wash your car windscreen?
Loss of output means buying make-up power. If you installed solar to power your business or farm, or if you're off-grid, you are even more reliant on maintaining the efficiency of your investment.