It’s a question all Canadians have asked at some point: “How can the sun feel so warm in Summer but not in Winter?” We won’t get into the finer details behind the seasons and meteorological science here, but this familiar anecdote drives at a core question that stops some people from investing in solar resources for their homes and businesses–will solar panels work in winter? Between the cold, snow, and short sunlight hours, it’s easy to see why the default assumption is that, somehow, solar technology and winter don’t mix.
The reality is that yes, solar panels work in winter. In this post, we will go into greater detail and explain all of the implications of winter weather and solar panels, explain why solar is a year-round investment, and give you the confidence to embrace renewable energy, no matter how cold the winters get where you live.
Winter introduces unique challenges for solar energy, but they’re not as serious as they might seem. Let’s explore some common concerns and how solar technology is designed to address them.
Many people don’t realize that solar panels work more efficiently in cold weather. Heat can reduce the efficiency of photovoltaic (PV) cells, so the cooler temperatures of winter actually improve their performance. While sunlight hours are shorter, the energy captured during peak sun hours remains highly effective—enough to power your home or business.
Modern solar systems are engineered to endure even the harshest winters. Panels are built with durable materials that resist freezing temperatures and heavy snow. In short, winter is no obstacle for properly installed solar technology.
It’s true that solar energy production dips during winter due to shorter daylight hours, but this is only part of the story. Solar systems are designed to optimize performance over an entire year. The excess energy produced in sunnier months—like spring and summer—can offset the seasonal drop in winter, thanks to programs like net metering.
By balancing seasonal highs and lows, solar energy provides a reliable, cost-effective solution for households and businesses alike.
Before 2018, it was believed that photovoltaic solar panels were significantly less effective because of snow buildup in winter. Researchers from the Northern Alberta Institute of Technology (NAIT) set the record straight many years ago. They analyzed data collected in 5-minute intervals on a daily basis for five years, finding that photovoltaic solar panels only lose about 3% of their energy due to snow buildup.
Solar panels convert sunlight into electricity more efficiently at cooler temperatures. In contrast to scorching summer days—where excessive heat can lower efficiency—cold weather helps PV cells operate closer to their optimal performance levels. So, while you may see fewer hours of sunlight in winter, the energy produced during those hours is often higher quality.
Yes, snow can temporarily cover solar panels and block sunlight. However, most panels are installed at an angle that allows snow to slide off naturally. The smooth glass surface of modern panels further prevents snow accumulation. And when snow does stick, it’s usually a short-lived issue.
Another interesting fact? Snow on the ground can act as a natural reflector, bouncing additional sunlight back onto your panels. Under the right conditions, this reflective effect can even boost energy production slightly.
NAIT’s research revealed that even during Alberta’s harsh winters, solar panels maintained consistent performance. If panels can thrive in such an extreme climate, they’re more than capable of handling winter conditions across Canada and the U.S.
Solar panels don’t need direct sunlight to generate electricity. They rely on photons, which penetrate clouds and even light layers of snow. This means your panels can still produce energy during overcast or snowy days, albeit at reduced levels.
Additionally, the overall impact of snow is minimal when you consider your system’s annual output. The majority of solar energy production occurs from March to October, when the days are longer, and the sun is higher in the sky. This surplus production helps balance the temporary dips in winter.
Heavy snowfall can temporarily block sunlight, but it doesn’t take much for your panels to get back to work. Properly angled panels encourage snow to slide off naturally, especially as sunlight warms the surface. For stubborn accumulation, a soft brush can quickly clear the snow without damaging the glass.
At Hydro Solar, we’re committed to helping homeowners and businesses transition to renewable energy solutions that meet their unique needs.
We offer a wide range of solar solutions, some of our most popular are:
Hybrid PVT Panels are a smart way to boost your energy efficiency while harnessing cutting-edge solar technology.
Solar Water Heating Kits are perfect for those looking to cut energy costs and reduce their carbon footprint. Learn how solar water heating works and why it’s an excellent investment for any property.
Fan Coil Units offer a reliable way to upgrade your heating and cooling systems for better energy efficiency.
If you’re curious about how solar technology can transform your home or business, we have a wealth of resources to guide you. For example, our detailed guide on how hydronic solar water heating works breaks down the process and benefits of using solar energy to heat water efficiently. It’s a great starting point to better understand how Hydro Solar’s systems work together to provide sustainable energy solutions.
Our team is ready to help you design a custom solar solution that fits your energy goals, budget, and local climate. Get started today with our design request form.
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