Do Solar Panels Work in Snow: What You Need to Know

It's a common myth - solar panels don't work during winter. Everyone believed it at some point, and rightfully so. Solar panels use sunlight to generate power. Hence, it's natural to assume they are useless in winter.

Fortunately, that's far from the truth.

Snow has minimal impact on solar energy production. In fact, colder temperatures significantly improve the efficiency of panels. Though snow on solar panels and shorter days may lower the output, the benefits still outweigh.

Someone in a northern state experiencing intense snowfall can install a solar panel and avoid paying hefty electricity bills during winter. So, next time someone asks you, "Do solar panels work in snow?" Tell them yes, but only with proactive management. Let's learn more about it.

Do solar panels work in winter?

Yes, they do. Solar panels convert solar energy into electricity. Hence, as long as there is sun, the panels will work fine, regardless of the air temperature.

In fact, contrary to popular opinion, low temperatures tend to improve solar panel efficiency. Thanks to photovoltaic PV cell technology, solar panels offer a better output in winter.

The National Renewable Energy Laboratory has launched Regional Test Centers dedicated to researching solar panel performance across varying climates. Researchers at RTC have shown that solar energy can still generate electricity in snow and harsh cold.

Let's understand this using the second law of thermodynamics. A rise in heat means lower power output. So, a solar panel will optimally perform better at 77 degrees Fahrenheit than one that goes up to 149 degrees Fahrenheit.

Therefore, solar panels are not only for sunny states like California and Florida; homeowners in cold states also benefit from them. The SEIA Solar Energy Industries Association ranked Colorado and Ohio among the top ten states with the most installed solar setups.

That said, shorter days and a few hours of direct sunlight might cause lower power output in winter. The lack of sun exposure due to snow might exacerbate the situation.

Do solar panels still work when covered in snow?

No, solar panels don't work when covered in snow. It blocks the sun's rays from reaching the panel, causing a lower power output.

Fortunately, light snow dust on your solar panels is no issue. Most panels are designed tilted with a 30-45-degree mounting facing south. This lets the snow naturally slide off, a process known as self-shedding. So, you can wait for gravity to do its job.

If it's not happening, you can take matters into your own hands. Use a roof rake or similar plastic tool with an adjustable handle to brush the snow off easily while standing on the ground. It's easy and convenient.

Moreover, the dark solar panels attract heat and melt snow dust naturally when it's sunny during the day. These panels are 36 degrees Fahrenheit warmer than the current air temperature, aiding them in better trapping sunlight and speeding up the melting process.

However, regions with frequent heavy snowing might cause intense ice accumulation. This completely blocks sun exposure and needs professional solutions. Regular maintenance, heating systems, and hydrophobic panel treatments might do the job.

Moreover, solar panels are designed to withstand certain pressure and weight, so you don't have to worry about heavily accumulated ice damaging the panel.

Overall, while solar panels in icy conditions produce less energy, the yearly percentage of energy production lost is minute. Hence, the investment makes sense for customers.

How to safely remove snow from solar panels?

Brushing off the snow from the solar panels will improve their efficiency and power output. Let's learn how you can do it effectively and safely.

Choosing the right tool

Here are some useful options to safely remove the snow from solar panels.

• A roof rake with an extendable telescopic handle is an excellent alternative to gently shrug off snow from the panel.
• You can also use a soft-bristle outdoor broom to sweep the snow off the solar panels. Avoid metal at any cost, as it can easily scratch the surface.

Remove the snow from the panel

Let's understand how you can get rid of the snow from the solar panels step-by-step.

• Start by inspecting the area. Make sure there are no sharp objects or power lines near the panels.
• Now, take your tool and work from the ground. A telescopic pole is easy to use and minimizes the risk of accidents.
• Gently brush off the powdery snow from the panel surface. Move your tool back and forth to clear it off before it becomes dense.
• If the snow densifies and adheres to the solar panel, you might need a plastic scraper. It breaks up the buildup without scratching the glass.

Safety Note: Getting into icy rooftops and dense snow is a recipe for disaster. Never climb onto the roof, as it only leads to accidents and risk of injuries. Instead, opt for maintenance packages. Many companies offer affordable offers during winter.

Preventing snow buildup on solar panels

Prevention is better than cure. So, why not take realistic actions to keep your panels from accumulating snow?

Use panel tilts

To many's surprise, shedding snow is possible with an optimal angle of your solar panels. Typically, these panels are mounted facing south to maximize sun exposure. But you can also benefit from it in cold climates. Simply tilt the panels at a steeper 45-55 degrees to let the snow naturally shed.

• Be careful not to cast shadows on other panels, as it directly influences the overall efficiency.

Technical upgrades

Technical upgrades like hydrophobic panel coatings and nano-chemical treatments are a great way to keep your panels snow-free. A little bit of these special anti-icing coatings goes a long way.

Reapply the coating two to three times every season. Focus on the areas where snow accumulates the most. Remember! Always follow safety protocol. Additionally, if you live in an area where frequent heavy snow is the norm, invest in a panel heating system. These micro-inverters automate the snow-melting process. The modern versions even allow controlling heat using thermostatic sensors.

For a reliable, high-performance solar panel that works well even in tough conditions, check out the Renogy 200W ShadowFlux Anti-shading N-Type Solar Panel. It uses advanced ShadowFlux technology to maximize energy output, even in partial shade, and is built to withstand heavy snow and strong winds for dependable energy in harsh environments.

Landscaping might help

Overhanging tree branches are yet another reason dense snow builds up on your panels. Consider trimming them off and see the difference.

Can snow damage solar panels?

Generally, the snow accumulated on your solar panel is not a concern. But, if you have witnessed frequent heavy snowing and a rooftop avalanche, it is better to be mindful of a few things.

First, the quality of your solar panels matters a lot. Reliable solar panels are tested under higher pressure and can withstand a certain weight.

Panels meeting the IEC 61730 and UL 61730 certifications are perfect for enduring harsh weather. These tests are evidence that the panels have undergone extensive testing, ensuring their thermal and mechanical safety.

The second major concern regarding your solar panel's durability is the ceiling, which is prone to ice dams. Ice dams usually occur when the snow buildup melts during the day and freezes overnight as the temperature drops.

After consecutive melting-freezing cycles, the ice seeps through the walls and causes flooding. Over time, it damages ceilings and walls. The good news! Proper insulation can prevent ice dams from worsening.

However, with seasonal fixes, you must consider long-term care. Companies offering post-winter inspections can help you treat any cracks, fractures, or frame damages on time. Early detection of problems will ensure a long lifespan and the desired efficiency of your solar panels.

Can solar panels be installed in the winter?

The short answer - yes. You can get many installers to set up solar panels in the winter.

Solar installation involves evaluating your area and energy needs, designing the arrangement, ordering equipment, and more. This can take up to a few months. Only a small part of it goes into physically installing the panels. Hence, most of it is not weather-dependent, and you can do it in winter.

Moreover, many installers also offer physical installation in winter. However, they usually inspect the area and evaluate the climate before proceeding. If the icy conditions, rain, and heavy snow interrupt the work, the installer might recommend waiting until the warm months.

Installing your solar panel system in winter means it will be up and working in summer. So, you can enjoy generating electricity during summer when installation is quite busy.

Snow on solar panels FAQs

Do you need to remove snow from solar panels?

Yes, you do. Solar panels covered in snow cannot generate electricity. The snow prevents sunlight from reaching the panel. Hence, clearing the snow from the panel maximizes their power output and promotes optimal performance.

The good thing is that a slightly dusty layer of snow will melt off itself or shred naturally, given the tilted mounting angle.

Do solar panels work when covered with ice?

No, solar panels cannot work when covered with heavy ice. When the panel has a layer of ice blocking the sun's rays, the photovoltaic cells cannot convert the daylight into electricity. Over time, it reduces the energy output and compromises production.

If the snow accumulation is dense and heavy, you must get professional snow removal services. Today, solutions like nano-chemical treatments, hydrophobic sprays, and heating systems are an excellent way to prevent solar panels from accumulating ice.

How long does it take snow to melt off panels?

It takes one or two days for the snow to melt off the solar panels. The dark and reflective surface of the solar panels makes them warmer than the current air temperature. Hence, solar panels melt the snow faster than usual with this generated heat.

Conclusion

Yes, snow on solar panels does not make them ineffective. Instead, the low temperature aids the panel's thermal efficiency and promotes energy production. However, this requires proactive management. So, make an action plan depending on the snow intensity and sunlight exposure in your area.

Consider professional services if natural methods like melting and shredding do not work. Though costly, early problem detection and preventive measures can save you money and prevent future repairs.