Dirty solar panels can negatively impact efficiencies by up to 35%! You should clean your panels every 3-6 months, and during that time dust, pollution, or bird poop may accumulate, causing shading on solar cells that interferes with energy production. If you’re located next to a busy and dusty county road, cleaning may need to occur more frequently.
In the video below, we compare a dirty solar panel and a freshly cleaned solar panel. If you’re measuring the change with a multimeter in constant voltage mode, the voltage will stay constant but the amperage should increase once panels have been cleaned. A higher current means we’re getting more power to the panels, and a lower current means we’re getting less power out of the panels.
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