When you think about the most suitable environment for solar panels, you probably imagine a place with a warm climate and long, sunny days. But what about cities known for cold winters? Do solar panels work in winter in cities like Chicago? You’d be surprised to discover that solar mechanisms can even perform better during the cold months.
This article will explore how snow on solar panels can affect their efficiency, debunk some common myths, and unveil strategies to maximize winter performance.
Like many other electronic devices, solar panels can overheat when temperatures get too high. They even may fail and shut down completely when the temperatures are extremely high.
So, the good news is you can generate solar power in winter. If there is light snow, you have nothing to worry about. It has a high albedo, reflecting the sunlight, which means your panels will consume light from multiple angles. However, the excessive amount of snow on solar panels can negatively affect energy production, and here’s how:
Solar panels in winter can still generate electricity, especially when the season is predominantly dry. It’s no secret that panels are most effective in a dry climate with mid-range temperatures (from 15°F up to 90°F). Chicago’s winters fit this temperature range.
Here’s the thing: solar panels and snow are not the best allies, so many solar installers recommend installing panels at a steeper angle. A tilt should be close to the location’s latitude to achieve the maximum sunlight on panels.
Pro tip: Illinois residents should place panels angled at 40°-45°. That is a steep tilt, so most snow will naturally fall from the panels. If possible, install a solar tracker that will slightly turn panels so they will receive the maximum sunlight. It will help you collect more electricity and melt some of the snow on solar panels.
Chicago is known for its harsh winters and murky mid-season weather, with pullbacks to the cold and snow even in April. Thus, cleaning snow off solar panels will be a routine process for Illinois residents.
Source: Weatherspark
Chicago experiences colder temperatures, with an average January temperature of 29°F and 38 inches of snowfall. It leads to slower snowmelt compared to regions with warmer winters. Strong winds can help you to remove solar panels’ snow. If you face windless weather, remove excessive snow from panels using soft brushes or microfiber brooms.
Looking for the right solar system able to endure any weather conditions in Illinois? Get your free solar quote in a matter of minutes!
A snow guard for solar panels is an additional tool that can help you prevent excessive snow accumulation. A snow guard is a physical barrier strategically installed on the surface or frame of a solar panel. Such barriers help manage snow accumulation and prevent it from affecting the efficiency of your solar panel system.
On average, Chicago receives 38 inches of snowfall annually. Most snowfall occurs between December and February, with lighter snow possibly occurring in March and November. Therefore, in Chicago, solar panels are covered in snow for 3-5 months annually.
While Illinois is not the coldest state in the U.S., the winter temperatures still warrant concern for the solar system’s structural integrity. The weight of sediments depends on their water content. Fresh snow or snow in cold regions is usually airier. At the same time, snow that has started to melt becomes more watery. It increases the density and weight per square foot.
Chicago’s colder temperatures can lead to slower snowmelt, potentially extending the period of snow cover on panels. However, this also means the snow might be lighter and less impactful on efficiency than wet, heavy snow in warmer regions.
It’s safe to assume that 1 inch of average snow accumulation weighs 1.04 pounds per square foot. Considering a solar panel might span several square feet, even a moderate accumulation can translate to significant weight.
To determine whether the snow on solar panels will harm your solar system, check a panel’s instructions and warranty to determine its designated snow load capacity. You should pick models that support a sufficient load of 40 to 100 pounds per square foot.
Solar panels covered in snow do work, but there’s a catch: only a light dusting of snow allows them to generate energy. Therefore, we recommend speeding up the melting process. While preventive measures like optimal tilt angle and snow guards can help, you may need to install heating elements to combat excessive sediments.
There are three types of heating systems: electrical, hydronic, and PVT. We’ve gathered all the information on their specifics in a big comparison table to help you choose the right system and deal with snow on solar panels.
| Parameter | Type of heating system | ||
| Electrical | Hydronic | PVT (Photovoltaic Thermal) Panels | |
| Description | Heating cables are attached to the back of the solar panel. When activated, these cables generate heat, melting snow. | A network of tubes embedded behind the panels circulates a heated fluid to melt snow. | These hybrid panels use excess heat generated by the solar cells to melt snow on the panel surface. |
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While choosing the preferable method, consider their cost-effectiveness. In addition, consult with a qualified solar installer familiar with your area’s climate to determine the best solar panels for cold climates.
It’s safe to say that cold weather helps panels remain productive. The only time snow noticeably changes system performance is during a snowstorm.
Chicago’s winters are famous for their snowfalls. Once you decide to install solar panels in Illinois, you need to accept the weather’s impact on electricity generation and consider measures to prevent the snow and ice accumulation.
Looking for the right solar system able to endure any weather conditions in Illinois? Get your free solar quote in a matter of minutes!