Snow on solar panels: will solar panels work in the winter?
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Solar panels are designed to generate electricity from the sun, so it's natural to assume that solar panels only work in sunny locations, leading Americans living in parts of the country who experience snowy winters to think that solar panels aren't a worthwhile investment.
However, the good news is, snow has much less of an impact on solar production than you may think.
So, how are solar panels affected by snow, and are they worthless in the winter? We answer those questions - and more - below.
Short answer — yes, they do. Solar panels convert sunlight into electricity, and as long as there is sunlight falling on the panels, it does not matter how hot or cold it is. In fact, photovoltaic (PV) solar panels work more efficiently in the cold.
This is because, like all electric-powered things, solar panels work best in chilly temperatures. When electronics are overheated, they can’t perform as well.
Manufacturers rate their solar panels for how well they perform based on their peak temperature, the temperature beyond which the efficiency of the solar panels starts decreasing. Once the temperature of the panels rises above that peak temperature, typically about 77 degrees Fahrenheit, their efficiency for creating electricity decreases.
In the winter, it’s less likely for solar panels to ever reach their peak temperature, which is why they are more likely to be performing at peak efficiency in cooler weather.
We will say, however, this increase in efficiency is offset by the fact that there are shorter days (and thus fewer hours of sunlight) during winter. This results in energy outputs during winter that are not drastically different from the outputs in summer, so it tends to balance out.
If you have a ground-mounted system, wiping off the snow should be quick and easy. Image source: Clean Energy Authority
If your panels are covered with a thick layer of snow, then no, they will not generate energy. But the good news is you can eliminate this issue by either waiting for gravity to do its job and have the snow fall off, or waiting for it to melt. Another option: cleaning them off yourself.
The below factors make snow on solar panels something you don’t really need to worry about:
Overall, snow should not dramatically impact solar panels or how they work in the winter. Just keep in mind that if the snow does not slide off or melt for a few days, at that point your panels might not generate electricity. However, generally, snow and cold weather will not be a huge hindrance in your solar array’s ability to generate electricity.
Snow guards can be added to your solar panel array to hold back large amounts of snow. Snow guards make sense if you live in a location that gets several feet of heavy snowfall throughout winter.
Because solar panels are slick, unlike standard roofing material, they do not offer much friction for the snow that collects on them. Without snow guards, snow can just rush off the panel and fall onto people or landscaping below.
The snow guards help keep the snow back so that instead of falling, it slowly melts.
Solar panels themselves should not suffer any damage due to heavy snowfall. All solar panels are built to last and are meant to withstand all kinds of weather, including snow.
If you live in a place that experiences regular winter weather, including snowfall - do not let that deter you from getting solar panels. Keep in mind, solar panels are very popular in some of the snowiest states. In fact, New York, Massachusetts, and New Jersey are all in the top ten states for solar panel installations in the country.
Whether you live in a state with full sun all year long or see your share of snowy winters, solar panels can help you save money and be more energy independent. Find out how much solar panels can save you all year long by using our solar panel cost and savings calculator.