Though it may seem like a quick and easy way using high pressure water to blast away dirt and debris, it can actually do more harm than good. You see, high-pressure water jets can damage the delicate surface of your panels, causing scratches and reducing their efficiency.
Using high-pressure washers on solar panels can put stress on the photovoltaic cells embedded in the surface of the panel.
The cell is tough and durable, but it isn’t designed for continuous exposure to water at high speeds—and in fact, flooding a cell with water at high speed is one of the main ways that manufacturers test their PV panels to see how well they’ll hold up over time.
You probably aren’t trying to destroy your panels, but even if you aim for gentleness and patience, you can still end up damaging them. In addition, these powerful streams of water can force water and debris underneath the panels, potentially causing damage to the wiring and electronics.
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