Do Residential Solar Panels Work in Winter?

Homeowners considering transitioning to solar energy often wonder if residential solar panels remain effective during winter. 

Despite harsh winter conditions in countries like Canada and Germany, solar energy plays a significant role in the growing solar panel industry. 

Are you curious about how solar panels work during the chilly winter months? 

This article will dive into all the details and explore the factors affecting their performance. 

Get ready to discover the secrets behind making the most of your solar power even when the temperatures drop!

Understanding Solar Panels

When it comes to renewable energy, solar power is a highly efficient and popular choice. 

This clean and sustainable energy source harnesses the sun’s power, converting it into two types of usable energy: electricity and heat. 

Solar panels, typically made from silicon or similar semiconductor materials, are designed to capture the sun’s energy using a complex process.

Each solar panel is encased in a sturdy metal frame and covered with a protective glass layer. 

When sunlight hits the panel, its photons – the tiny energy packets that makeup light – interact with the semiconductor material. This interaction releases electrons, creating an electrical charge.

This process is known as the photovoltaic (PV) effect, which generates direct current (DC) electricity. 

However, since most household appliances use alternating current (AC), this DC electricity must be converted into AC using an inverter. 

Once converted, the electricity flows through the building’s electrical system, powering appliances and devices through regular wall sockets.

It means solar panels are most effective during the summer, with longer daylight hours and stronger sunlight. 

However, they still generate power during winter, although their efficiency is up to 3% lower due to shorter days and weaker sunlight.

Solar Panels in Winter

Many people believe that solar panels are unsuitable for areas with winter climates, such as Canada, for two main reasons: 

  1. Cold Temperature
  2. Snow 

Although these two factors can indeed impact the performance of solar panels, they do not make solar installation a futile investment in places where snow is frequent. 

Why? Let’s take a closer look.

Temperature Effects

Solar panels can be more efficient during winter, which may seem surprising. Unlike popular belief, solar panels use sun “light,” not “heat,” to produce electricity. 

So, as long as there is sun, regardless of the atmosphere’s temperature, your solar panel will continue to produce sustainable energy. 

In addition, when the temperature drops, solar panels work even better. It means that you can potentially generate more solar energy on a sunny, cold day than on a hot, sunny day. 

So, how does this work? 

Everything comes down to the energy difference between sunlight and the electrons in the solar cells. 

The greater the energy difference, the more power is produced. And in colder conditions, that energy difference is even higher. 

That means more energy can be produced when sunlight hits the solar cells.

In essence, solar panel technology is adaptable and resilient in various climates, making it an excellent energy source even in places that experience heavy snowfall. 

The City of Edmonton is a prime example, with its significant stride in embracing solar energy by installing a megawatt-scale solar project in 2020

This successful implementation in a snowy environment highlights the efficiency of modern solar panels, even in snowy environments with reduced sunlight and increased snow cover.

Snow Accumulation

During winter, snow accumulation on solar panels is a significant concern. Wind may quickly clear light snow or melt away, but heavy snowfall can block sunlight, thus reducing electricity production. 

If a solar panel is completely covered with snow, preventing sunlight from reaching its photovoltaic (PV) cells, it won’t be able to produce electricity.

Fortunately, most solar panels are installed at an angle, which helps naturally shed snow. The panels capture sunlight and absorb some of the sun’s heat. 

This design feature, combined with their typical sun-facing orientation and slope, aids in snow removal. 

Interestingly, snow’s translucent nature allows solar energy to reach the panels even when covered. 

An often-overlooked aspect is the albedo effect—snow’s high reflectivity. 

It acts like a mirror, reflecting additional sunlight onto the panels, harnessing more solar energy than on days without snow.

Additionally, solar panels have dark, reflective glass surfaces that accelerate snow melting, causing it to slide off more quickly before it can affect performance significantly. 

Installation racks are often tilted at angles between 30 to 45 degrees, further discouraging snow accumulation.

While a light layer of snow will likely blow off or melt swiftly, heavier coverage can temporarily decrease power output. 

However, the impact of snow on annual solar panel production is generally minimal and won’t affect your overall investment.

How to Maximize Solar Panel Efficiency in Winter

Maximizing your solar energy potential in the winter involves a combination of strategic installation and smart energy practices. Here’s how you can ensure your solar panels are winter-ready and operating at their best:

  • Optimal Panel Angle: When installing your solar panels, it’s crucial to position them at an angle that captures the most sunlight, especially during the winter days. Your solar installer should determine the best angle for maximum sunlight absorption, enhancing the efficiency of your panels throughout the colder months.
  • Premium Installation: Solar panels are designed to withstand heavy snow loads, ensuring durability and continued functionality even under a blanket of snow. Their robust construction means they can endure harsh winter conditions without damage. Thus, partner with an installer that only uses premium-quality materials.
  • Be Energy-Savvy: Adopt energy-efficient practices like Insulating your home to keep the warmth in and the cold out, switch to LED lighting for lower energy consumption, and choose appliances with high energy-efficiency ratings. You will reduce overall energy usage and complement your solar panels’ efficiency.
  • Battery Storage Option: Battery storage is a smart investment for solar power. When there is little sunlight, it provides backup power by storing solar panel energy. This is especially useful during winter months. Talk to your solar installer about adding solar batteries for a consistent power supply on cloudy or snowy days.


Residential solar panels can function efficiently during winter. Although less efficient than in the summer, they are still a viable renewable power source. 

Concentrating on the system’s annual production of electrical energy rather than its daily production is crucial.

If you want to install solar panels in your Alberta home, contact our professionals at Gridworks Energy. We are experts in installing functional home solar panels regardless of the weather. 

Although heavy snow cover may slightly reduce electricity production, the long-term production illustrates the Return on Investment (ROI) that solar can bring to your home in Alberta.

As solar technology continues to advance, the efficiency and reliability of solar panels in all seasons, including winter, are expected to improve further, so take advantage now!


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