Do solar panels work in snow or cold?
In the Northeast, a trending query asked of our solar technicians is: “Do solar panels work in snow or cold?”
In this blog we will debunk myths, explain how to maximize solar panel efficiency during Massachusetts winters, and what not to do so you don’t risk damaging your solar panels in the winter.
Optimizing solar panel performance in winter
Massachusetts winters can be mild with few snowstorms or not-so-mild with lots of snow, wind, and not a lot of sunlight. Shorter days and the lower angle of the sun reduce the intensity of the sunlight reaching your solar panels, reducing total energy production.
These conditions can reduce the output of your solar system, but fortunately, these steps can ensure that you get the most from your solar investment:
- Keep panels free of dirt, leaves, and debris.
- Call upon a roof-top professional with the proper training, equipment, and knowledge for safe clearing and cleaning panels, checking for any needed repairs, and making necessary adjustments.
- Schedule regular inspections throughout the year to identify potential roof and/or solar panel issues and to make necessary repairs before the winter months.
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Myth #1: Solar panels are inefficient during the winter months
While shorter days and the sun positioned lower on the horizon decrease output, solar panels are built to keep generating clean, renewable energy throughout the winter. In fact, they are designed to perform most efficiently as temperatures drop. The best solar production is often in later winter when the combination of cold temps and clear skies is perfect for producing electrical power. So Yes; solar panels work in snow or cold weather.
Myth #2: Snow creates a barrier that shuts down solar production.
Solar panels should be installed at the proper angle so that snow tends to slide off once the sun warms a panel corner. This melting and sliding often occurs even faster than snow melts off a shingled roof. In addition, the solar panels’ dark surface absorbs heat, helping the snow to melt. Heavy snowfall can reduce energy production by blocking sunlight. However, this effect is often minimal relative to overall yearly output.
Solar panels are built to withstand considerable weight, but you should check with your installer or the manufacturer of your solar panels before attempting to remove snow yourself. Don’t try to scrape the snow or ice off the solar panels. You can damage the panels. Self-removal is risky and may void your warranty. Let the sun do the work or have a trained solar professional remove heavy snow or ice accumulation.
A light dusting of snow or a partially exposed panel can continue to generate some electricity. In fact, a light dusting of snow has little impact on solar panels because the wind can easily blow it off and light can penetrate a sparse coating. In addition, the snow-covered ground below can act as a reflector, boosting light exposure. Ice also creates uneven shading, which further reduces efficiency. So Yes; solar panels work in snow or cold weather.
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Myth #3: Cold temperatures reduce solar panel efficiency.
Contrary to this popular myth, cold temperatures actually reduce the electrical resistance in photovoltaic cells. This allows the solar panels to produce electricity more effectively than in hot weather. Contraction from the cold can potentially affect solar panel components, mounting structures and battery units. However, cold can also positively affect solar energy production by preventing the panels from overheating, allowing them to produce more power per unit of sunlight.
The outcome is that cold winter weather increases solar panel efficiency, but less sunlight decreases total energy production. So Yes; solar panels work in snow or cold weather.
An interesting factoid about Worcester, MA
Worcester MA gets more solar radiation than Berlin, Germany. In fact, Germany leads the world in solar capacity.
You can improve your solar panels’ Winter performance, no matter where you live, by clearing panels, monitoring output, and using professionals to inspect, clean, and repair panels prior to the season.
In summary
Optimize the efficiency of your home’s solar panels this winter by preparing for seasonal cold, wind, snow, ice, and debris. Always hire a reputable installer like Golden Group Roofing and Solar for precise installation, ongoing maintenance, and responsiveness to its customers. Hiring an all-in-one roofing and solar company like Golden Group, with both roofing and solar experts, is more effective and efficient than hiring two separate companies for roofing and solar.
If you have questions about solar energy efficiency in the Northeast winters or year-round solar production for your home, call (508) 841-5206 or contact us for a complimentary consultation.
