How Much Efficiency Do Dirty Solar Panels Really Lose?
By Coastal Solar Clean
Studies show dirty solar panels can lose 10-30% efficiency. We break down what that means for Central Coast homeowners and what to do about it.
Solar panels can lose 10-30% efficiency from soiling. On California Central Coast, coastal salt air, dry-season dust, and bird activity create demanding soiling conditions. A 10kW system losing 20% efficiency means approximately 2,000 kWh per year lost — about $560 at California electricity rates. Professional cleaning with deionized water restores output and is the highest-ROI maintenance activity for your solar investment. Recommended cleaning frequency: every 3-4 months for most Central Coast properties.
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