Quick Answer
If solar panels get covered in snow, their efficiency is significantly reduced, potentially losing up to 80% of their energy output, depending on the depth of the snow and the angle of the sun.
Understanding Snow’s Impact on Solar Panel Efficiency
When snow accumulates on solar panels, it creates a layer of insulation that prevents sunlight from penetrating to the photovoltaic cells. This results in a significant drop in energy production. For every 10 inches (25 cm) of snow, solar panel efficiency can decrease by up to 80%. In extreme cases, snow-covered panels can produce as little as 5-10% of their normal output.
Techniques for Clearing Snow from Solar Panels
To maintain optimal efficiency, it’s essential to clear snow from solar panels regularly. Using a soft-bristled brush or a specialized snow rake with flexible teeth is recommended, as these tools won’t damage the panels’ surface. For areas with heavy snowfall, consider investing in a roof-mounted snow removal system or a snow-melt mat, which can be especially effective for solar panels installed on flat rooftops.
Considerations for Polycrystalline Solar Panels
Polycrystalline solar panels, with their slightly lower efficiency rates compared to monocrystalline panels, are more susceptible to snow’s negative impact. However, their relatively lower cost and ease of maintenance make them a popular choice for off-grid applications. To mitigate snow’s effects on polycrystalline panels, consider installing a slight tilt (around 30°) to allow snow to slide off more easily. Regular cleaning and maintenance will help maximize the panels’ energy output even in snowy conditions.
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