According to SEIA and Wood Mackenzie, the United States installed 43.2 gigawatts (GW) of new solar capacity in 2025, after a record of about 50 GW in 2024, making solar the country’s top source of new power for the fifth year in a row. But there is one genuine question that interests anyone who wants to install solar panels on their roof: “Do solar panels work in the winter?”.
You can be calm; with proper maintenance, solar panels are productive in any season. This article covers everything you need to know about solar power in winter, including maintenance tips, installation advice, and ways to maximize the panel’s efficiency.
Solar panels work in winter, but their efficiency may vary depending on the weather. Most U.S. states have mild winters, so you may see a great panel’s efficiency that meets benchmarks during cloudless weather.
While solar critics may say solar panels don’t work in the cold, that’s untrue. They work fine within the temperature range set by the manufacturer (typically from -40°F up to 185°F). Even the coldest Alaskan cities fall into that range. Solar panels aren’t filled with water, so they can’t freeze even in harsh Arctic Circle weather. In fact, cold makes panels more efficient: they convert sunlight into electricity better when they are cool. Winter output drops because of shorter days and snow cover, not because of the cold itself.
The number of hours of sunlight is a more critical factor than excessive clouds. Solar panels in winter generate less electricity because they have just 6-7 hours of direct sunlight. During summer, they usually get 10-13 hours of the Sun’s exposure.
Snow on solar panels can block sunlight and further reduce efficiency. If there is light snow, panels generate the usual amount of electricity. Meanwhile, blizzards can put a snow shade on panels, negatively affecting their productivity.
During short winter days with heavy snowfall, panels may produce only a fraction of their potential. If your utility provider offers net metering, consider signing a contract. This allows you to sell excess electricity generated in the summer for credits, which can help lower your electricity bills during less productive winter days. Keep in mind that many utilities have switched to net billing, which credits exported power at a lower rate than you pay for grid electricity (for example, California’s NEM 3.0), so summer credits may cover less of your winter bills. In this case, a home battery can help you use more of your own solar power.
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You can install residential solar panels during winter colds but not in the snowfall. While cold isn’t a problem for the panels, heavy snowfall or icy conditions could make installation dangerous for the workers.
Since winter has shorter daylight hours, the installation crew might have less time to complete the work each day, potentially extending the project timeline. So, if you need to install solar panels in winter, do it on a dry, snowless day and be prepared to postpone some deadlines.
However, solar installers might be less busy in winter, so you could schedule an installation sooner and benefit from quicker turnaround times. Meanwhile, some regions might offer special incentives for solar panel installations during the off-season to encourage citizens and businesses to use green power.
Source: CSIRO Research
Snow on solar panels impacts the system’s efficiency, but not as drastically as you might think. Light snow on the roof may reflect sunlight upwards, potentially increasing the light reaching the panels. Meanwhile, excessive snow on solar panels after blizzards negatively impacts power generation:
Solar panels and snow are not companions. Installing panels at a steeper angle facing south helps snow slide off naturally and lowers the possible snow coating on panels. You can also install snow guards. They don’t stop snow from building up on the panels; instead, they hold it on the roof so it doesn’t slide off in large, heavy sheets that can damage gutters or injure people below.
Neglecting maintenance and leaving snow on solar panels may cause your panels to become less productive.
If you live off-grid, you should get powerful batteries to store all possible excessive electricity you generate during the day. If it’s possible, buy a backup power option like a gasoline generator. It’s not the most eco-friendly option, but it helps you to live off-grid life during heavy blizzards with snow on solar panels.
Beware that reduced efficiency might be a symptom of a larger problem with the solar system. Degradation due to age, extreme weather events, or manufacturing defects can lead to lower efficiency over time.
General solar maintenance rules stay the same regardless of the season. You should track the system’s performance and prevent shading from trees or snow. Solar panels rely on sunlight to generate electricity. When a panel is partially shaded, its output drops, and in older systems, it can affect the whole string.
Most solar panels are wired together in series, like Christmas lights. It means the current produced by all the cells flows through a single circuit. The problem is that a shaded cell acts like a weak link in the chain. Modern panels limit this effect with bypass diodes and half-cut cells, and many home systems use microinverters or power optimizers, so one shaded panel no longer drags down the entire array.
Source: Visual Capitalist
When there is too much snow on solar panels, they become shaded and “reverse-biased.” Long story short, instead of providing energy, the cell starts to absorb it from the nearest well-performing cells.
The panel can’t convert this energy to electricity, so it starts to dissipate as heat. This concentrated heat buildup creates a “hot spot” on the shaded cell. If not addressed, hot spots can damage cells over time. Bypass diodes protect most modern panels from this, and snow keeps panels cold, so the risk from snow cover is low, but long-lasting partial shading is still worth avoiding.
Thus, it’s worth removing heavy snow buildup from solar panels when you can do it safely. While light dusting might not significantly impact efficiency, heavy snowpacks cause excessive shading.
Meanwhile, you don’t need to clear the roof or backyard from snow since it reflects the light. This process is called the Albedo effect and increases panels’ productivity.
To maximize the amount of energy generation during winter, ask your installer whether your mounting system allows tilt adjustment. Most rooftop systems are fixed, but ground-mounted arrays and adjustable racks can be tilted more steeply for winter. Steeper angles not only capture more of the low winter sun but can also prevent the accumulation of snow on solar panels. Even small adjustments of 6-8° will help.
You can use heating systems to melt the snow when it’s landed on the panels. If that’s not possible, install the solar panel snow guard. In this case, snow can still accumulate on the panels, but it won’t slide off the roof in enormously large sheets. While shading from the snow may reduce efficiency, the falling snow won’t damage gutters or the property below.
To ensure safe cleaning snow off solar panels, use a dry cloth mop, the softest possible bristled brush, or a snow rake specifically designed for solar systems. You should never use shovels, metal tools, or abrasive materials that could damage the panels.
If you have an off-grid or hybrid system with batteries, store them at recommended temperatures. Some can handle short-term, chilly weather lower than -4°F, but it is still not recommended to continuously use them during the extreme cold.
Solar panel snow guards can mitigate snow accumulation from avalanching off in large sheets. There are just 2 types of guards:
You can install both snow guards for solar panels on your property. They reduce panel damage by preventing large sheets of heavy snow from sliding off and potentially cracking the glass or damaging the mounting system. Guards also minimize the risk of snow avalanches that could injure people or damage property below the roof.
Another way to remove snow from solar panels is to install heating elements to combat excessive sediments. Solar panels covered in snow still function, but it’s better to prevent the shading if possible.
There are three types of heating systems: electrical, hydronic, and thermal (PVT). To save you time, we’ve gathered their crucial differences in the comprehensive table.
| Parameter | Type of heating system | ||
| Electrical | Hydronic | PVT (Photovoltaic Thermal) Panels | |
| Description | Heating cables are connected to the rear part of the solar panel. Once you turn the heating system, these cables will start to heat, causing slow snow melt. | A heated fluid circulates through a network of tubes behind the panels to melt snow. | These are solar panels that use excessive heat generated by the panels itself to melt the snow |
| Pros | Easy to use and fits small systems | The most energy-efficient variant | You don’t need to install additional equipment |
| Cons | Needs a lot of energy to work. Due to cost, it may not suit large-scale systems | Tricky and costly. In most cases, it requires additional plumbing | The most expensive option. In some cases, it’s cheaper to install traditional panels + electric/hydronic heater |
While picking the best way to remove unwanted snow on solar panels, evaluate your situation in the long run. What may look beneficial today may become tomorrow’s hurdle. Consult with a qualified solar installer familiar with your area’s climate to determine the best choice for you.
Solar panels can brighten your life even during the darkest winter days. Proper component maintenance ensures maximum productivity, so remember to clean them regularly. After blizzards, check mounting systems to ensure your panels are securely attached to the roof.
It’s easy to maintain panels even in the cold. Answering the question “Do solar panels work in the winter?”, we can clearly say that with proper maintenance they keep producing electricity all winter, although output is usually lower than in summer because of shorter days.
If you see excessive snow on solar panels, use a soft-bristled brush or a snow rake designed for solar panels to remove it. If possible, install heating systems or snow guards. They will protect panels and your property from heavy snow during blizzards.
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Yes, your solar system can still generate energy during winter. A thin layer of snow on the roof can act as a reflector and increase panel efficiency. Meanwhile, excessive snow on solar panels can provide unnecessary shade during a blizzard, lowering the system’s productivity.
Solar panels can work during blizzards with heavy snowfall, producing less energy than expected. Meanwhile, light snow can act as a reflector, increasing the system’s efficiency.
Since winter days are 3-7 hours shorter than summer, it can result in a 20-50% productivity drop. Snow on panels is a minor factor that doesn’t have that much influence on the system’s efficiency.
Use a soft-bristled brush or dry mop to clean the panels’ surface without scratching them. Clean the system with a special snow rake designed specifically for solar panels.
Yes, they will remain productive with proper maintenance even on short cold days. Remove the excessive snow to prevent potential shading. Use the soft bristled brush or special solar panel snow rake for it.
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