Rain Water Alone Will Not Clean Solar Panels

People often wonder if rain is enough to clean their solar panels. Although rain will provide a minimal rinse off any loose dirt or dust, it will not remove the baked in dirt and debris. To illustrate this, consider what would happen to your car’s windshield if you didn’t clean it for 6 months? The grime and dirt would “green over”, completely blocking your visibility (and light) from entering your car. Think about how dirty your car/windshield gets even after several weeks. And the morning after a rain, remember how your car (if left outside) seems even dirtier than before, like the dust and dirt was just moved around.
The fact is that rain contains dust particles that settle and attach to the surface after the rainwater evaporates.
Also, the minimal loose dust that does move by the rain will lead to dust accumulating in the lower row of each solar panel, which can cause significant heating and significant decrease in production.
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