When you install rooftop solar you save thousands on your electric bill, but if you live somewhere that gets lots of snow in the winter, you may also be at risk for a winter-specific side effect. Sometimes, large amounts of snow will slide off your solar panels all at once, which can damage your property. In this article, we will discuss solar snow guards, what they do, and why you might want to ask your solar installer to include them in your solar array.
Solar panels and snow
Most North American residential roofs are made from asphalt composition shingles. These shingles are constructed with a rough surface, which is designed to ensure your roof surface has friction.
As snow falls on asphalt composition shingles, snow and ice will tend to accumulate and cling to the shingles’ rough surface. As the snow and ice melts, the resulting water runs down the roof below the frozen mass. This roof design can prevent snow from catastrophically falling off your roof all at once by removing meltwater and introducing friction, which keeps the snow and ice from sliding so it can melt away gradually instead.
When you install rooftop solar panels, you replace your typical high-friction roof surface with the smooth glass surface of solar panels, which is very low-friction. Unlike the textured surface of asphalt shingles, the glass face of a solar panel creates a situation where melting snow and ice acts as a lubricant (instead of trickling off the roof), causing the panel surface to become frictionless and releasing the entire snow load at once. This can create dangerous situations where passersby can be hit by big chunks of snow falling from your roof. Additionally, falling snow can damage your landscaping, outdoor furniture, gutters, and vehicles.
Snow guards for your solar panels
A solar panel snow guard is a physical barrier you can install in between or on the edges of your solar panels. It’s designed to prevent the mini avalanches that can occur when you install rooftop solar.
Solar snow guards catch snow sliding off of your panels, which keeps them from falling all at once. Instead, systems with snow guards release small amounts of snow at a time or hold snow on the roof to let it melt. Snow guards are usually simple to install with screw-on clamps to keep the guards in place. Companies like Alpine SnowGuards offer several variations on the solar panel snow guard, depending on your aesthetic preferences.
Are solar snow guards right for you?
The majority of rooftop solar customers won’t need to worry about solar snow guards for two main reasons. Rooftop solar is becoming increasingly popular around the country, and many installations are taking place in states with little to no snowfall like Florida and Arizona.
In addition, even in areas with snowfall during winter months there is often not enough snow to cause a large avalanche. Because the surface of solar panels are dark, snow will often melt quickly and not last long enough to accumulate and cause a catastrophic release. Only in places where you are likely to have large snowstorms that drop several inches of snow during a short period of time will you need to worry about snow buildup and dangerous snow release.
However, snow guards for solar panels are a relatively low-cost upgrade. Ensuring your system is safe off chance that you do experience a large snowstorm may be enough incentive for some homeowners to want to invest in solar snow guards. After all, it can be better to pay a little extra up front to make sure that none of your property is damaged, and that nobody you care about or know is at risk of being hurt by falling snow from your panels.
Solar panel performance in the snow
Solar panels are dark and often installed on a tilted roof surface, and snow will naturally melt and slide off of them. Due to this natural snow removal and the fact that cold weather helps electronics in your panels run more efficiently, solar energy systems actually perform very well in the winter. It is important to note that snow guards may slightly increase the amount of snow that sits on your panels, which will reduce your power production throughout the winter months.
Compare personalized options for solar
On the EnergySage Solar Marketplace, you can solicit quotes solar projects from qualified, pre-vetted installers in your area. If you have a question or concern about snow or snow guards for your solar panels and home, you can leave a note on your profile outlining your question, and installers will know that you want more information about what they can do to make your solar array efficient and safe in the winter months.