The UK is in the grip of winter.
Frosty mornings and shorter days will be the norm for another couple of months.
If you’ve recently installed solar panels, you might be looking at your generation figures and wondering about their performance during these darker months. With temperatures dropping and more cold weather forecast before winter’s out, it’s natural to question how well your solar investment will serve you through the rest of the season.
Solar panels can handle winter conditions better than many people expect. While output naturally reduces during winter months, understanding how your system works in colder weather will help you get the best value from your investment throughout the year.
Your panels continue generating electricity even on the coldest days, and some aspects of winter weather can actually improve their performance. Learning how different conditions affect your system and making small adjustments to your energy use can help you maintain significant benefits from your solar panels right through the winter months. This blog explains everything you need to know.
How do solar panels perform in winter?
Solar panels rely on light rather than heat to generate electricity.
During the winter months, the UK experiences fewer daylight hours, which affects how much power your panels can produce. A typical December day offers about eight hours of daylight, compared to 16 hours in June.
However, colder temperatures can actually benefit your solar panel efficiency. Solar cells operate more effectively in cooler conditions, as excessive heat can reduce their performance. Your panels might generate more power on a bright, cold winter day than during a scorching summer afternoon.
Cloud cover also plays a significant role. While thick clouds reduce generation, your panels will still produce electricity on overcast days. Modern solar technology can capture both direct sunlight and diffused light that passes through clouds.
Getting the most out of your solar panels during winter
In winter, the amount of power your solar panels generate will typically drop to about 20-30% of summer levels. So, a system that generates 350 kilowatt-hours (kWh) in July might only produce around 70-105 kWh in January. The reduction comes mainly from shorter days and the sun’s lower position in the sky. During the winter months, the sun travels a shorter path across the sky and stays lower on the horizon, meaning sunlight travels through more atmosphere before reaching your panels.
Your monitoring system will give you valuable insight into your seasonal generation patterns. Check your daily figures to build a picture of your typical winter performance. Most systems let you compare current output with previous months, helping you understand your normal seasonal variations. Many also track factors like your peak generation times and daily energy totals, giving you detailed information about your system’s winter performance. Understanding these patterns will help you plan your energy use more effectively and spot any unusual drops in generation that might need attention.
Snow can temporarily reduce solar generation by blocking light from reaching the PV cells in your panels. However, UK snowfall rarely has a long-term impact on solar performance. Most panels sit at an angle that helps snow slide off as the surface warms. Light snow often melts quickly from solar panels, as their dark surface absorbs heat, even in winter conditions. Heavy snow might need time to clear, but your panels will usually resume normal operation once the snow melts or slides away.
Making the most of winter solar generation
Adapting your energy habits to your winter generation patterns will help you maximise the benefits of your solar system. Running appliances during daylight hours uses more of the electricity your panels produce. Simple changes like setting your washing machine, dishwasher or tumble dryer to run during mid-morning or early afternoon can significantly reduce your reliance on grid power.
Battery storage can also help. Storing the energy your panels generate during sunnier periods will help bridge any gaps when your generation drops. This stored power reduces your reliance on grid electricity during peak evening hours when energy costs more. Modern battery systems can store enough power to keep your home running through the evening and into the night, making the most of every unit of electricity your panels generate during the shorter winter days.
If you have a smart meter, it will show you exactly when you use electricity. This information will help you match your power-hungry activities to when your solar panels are generating the most electricity. Many smart meters connect to phone apps, letting you track your energy use in real time and spot opportunities to shift your consumption to sunnier periods, when your panels are generating more power.
Regular monitoring will help you spot any winter-specific issues. Check your generation figures weekly to identify any unexpected drops in performance that might indicate problems. Most issues are simple to fix when caught early.
Common winter solar myths
Many people believe cold weather stops solar panels from working. In fact, cold temperatures can improve panel efficiency by reducing electrical resistance in the system. Solar panels convert light into electricity more efficiently in cold conditions than in hot weather, as the electrons in the solar cells become less active at higher temperatures. This means your panels can generate power effectively even on the chilliest winter days.
And clouds don’t completely stop your panels from generating power. Even on grey days, your panels can capture enough light to produce useful amounts of electricity. Modern panels convert both direct and scattered light into power. While thick cloud cover reduces output, your panels can still generate significant power under typical UK winter conditions. The technology in current solar panels has improved dramatically, allowing them to capture and convert different types of light into usable electricity.
While winter generation decreases, your system will continue working effectively throughout the year. The seasonal drop in output will balance itself out against higher summer production, providing reliable year-round benefits. Most UK solar installations generate enough excess power during summer months to offset lower winter production, creating a balanced annual energy profile. You can further enhance these benefits by getting a solar battery installed to store any excess electricity your panels generate for later use.
How can we help?
At Electrical Innovations (Derby) Ltd, we support solar panel owners throughout the year. We’re here to help you get the most from your solar investment throughout every season.
Our team understands how UK weather affects solar systems and can help optimise your setup for winter conditions. Contact us today to get a quote for a new home solar installation or book a winter system check-up.
