18/06/2026
🌧️ MYTH VS FACT
Myth: Rain cleans solar panels.
🚗 Think about your car...
If your car is covered in dust and dirt, would one rain shower leave it spotless?
Probably not.
The same applies to solar panels.
While rain can help wash away loose dust, it often isn't enough to remove:
🐦 Bird droppings
🌿 Pollen and organic matter
🏭 Pollution and airborne contaminants
🌊 Salt deposits in coastal areas
🌬️ Dirt that has baked onto the glass surface
In some cases, rain can even leave behind water spots and residue as it dries.
Why does it matter?
Solar panels rely on sunlight reaching the solar cells beneath the glass.
When dirt accumulates, less sunlight reaches the cells, which can reduce energy production.
The impact depends on:
☀️ The amount of soiling
☀️ The type of contamination
☀️ The location of the site
☀️ The system design
Some studies have shown that heavily soiled panels can experience significant performance losses compared to clean panels.
The takeaway
💡 Rain helps.
💡 Rain does not replace inspections.
💡 Rain does not guarantee clean panels.
Just because a solar array has been through a few rainstorms doesn't mean it's operating at its best.
Have you ever seen a solar array before and after a proper clean? The difference can be surprising.
👇 Do you think rain is enough to keep solar panels clean?
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