When you think about solar panels, you probably picture long summer days and plenty of sunshine. But what happens when the British weather takes a turn and we’re faced with shorter days, grey skies and freezing temperatures?
It’s one of the most common questions homeowners ask when considering solar energy: Do solar panels actually work in winter?
The short answer is yes. Solar panels continue generating electricity throughout the winter months, even when it’s cold or cloudy.
However, the amount of electricity they produce changes throughout the year. Understanding how seasonal conditions affect solar generation can help you decide whether solar panels are right for your home.
Do solar panels generate electricity in winter?
Yes. Solar photovoltaic (PV) panels generate electricity from sunlight, not heat. This means they can continue working throughout winter, provided there’s sufficient daylight reaching the panels.
Even on cloudy days, some sunlight passes through the clouds, allowing solar panels to generate electricity.
What changes during winter is the amount of available sunlight.
In the UK, winter brings shorter days, a lower sun and generally more cloud cover. These conditions reduce the amount of electricity a solar system can generate compared with spring and summer.
But that doesn’t mean your solar panels stop working when the temperature drops.
In fact, solar panels can operate more efficiently in cooler temperatures. It’s the reduction in daylight, rather than the cold itself, that has the greatest impact on winter generation.
How much electricity do solar panels generate in winter?
Solar panel generation varies throughout the year, with the highest output typically occurring during spring and summer.
During winter, shorter daylight hours and less intense sunlight mean your panels will generate considerably less electricity.
The amount depends on several factors:
System size: The number and output capacity of your solar panels.
Roof orientation: The direction your panels face.
Roof pitch: The angle at which sunlight reaches the panels.
Shading: Nearby trees, buildings and other obstructions.
Location: Regional differences in daylight and weather conditions.
For example, a solar installation in Nottingham may generate significantly more electricity in June than in December, even though the same panels are being used.
This seasonal variation is normal and should already be reflected in the annual generation estimates provided by your solar installer.
At GLSR Solutions, we assess your property’s roof layout, location and potential shading to provide an estimated annual generation forecast before installation.
Do solar panels work on cloudy and rainy days?
Yes, and that’s particularly important in the UK.
Solar panels don’t need constant direct sunshine to generate electricity. They can also use diffused sunlight, which is light scattered by clouds and the atmosphere.
On a heavily overcast day, generation will generally be lower than on a clear, sunny day. However, your system can still produce electricity.
Rain doesn’t prevent solar panels from working either. In fact, rainfall can help wash away some surface dust and dirt.
The important distinction is that solar panels work with available sunlight rather than relying on hot, sunny weather.
So, while a grey November afternoon won’t produce the same results as a bright June morning, your solar installation can still contribute towards your household’s electricity needs.
Do solar panels work better in cold weather?
This might come as a surprise, but solar panels can actually perform more efficiently at lower temperatures.
Like many electrical components, solar cells are affected by heat. As panel temperatures increase, their conversion efficiency generally decreases.
Cooler conditions can therefore help solar panels operate efficiently when sufficient sunlight is available.
A bright, cold winter morning can provide favourable conditions for solar generation.
However, this doesn’t mean solar panels produce more electricity in winter overall.
The shorter days and lower levels of sunlight usually outweigh any efficiency benefits from cooler temperatures.
What happens to solar panels when it snows?
Snow is relatively uncommon across much of Nottinghamshire and the Midlands, but it’s still worth understanding how it affects solar panels.
A light covering may have little impact, particularly if it melts or slides off the panels.
However, a thick layer of snow can temporarily reduce or prevent electricity generation by blocking sunlight from reaching the solar cells.
Most domestic solar installations are fitted at an angle, which can help snow slide away as conditions improve.
You should avoid climbing onto your roof or attempting to remove snow from panels yourself.
Once the snow clears, the panels can resume normal generation.
Can solar battery storage help during winter?
Solar battery storage can help homeowners make better use of the electricity their panels generate, including during winter.
Without battery storage, any solar electricity you’re not using is generally exported to the grid.
With a compatible battery system, some of that surplus electricity can be stored for use later, such as during the evening when your panels are no longer generating.
However, it’s important to understand that a battery doesn’t increase the amount of electricity your solar panels generate.
During winter, when solar production is lower, there may be less surplus electricity available to charge the battery.
Some home battery systems can also charge from the grid during cheaper off-peak tariff periods.
This can be particularly useful during winter, allowing homeowners to store lower-cost electricity for use when electricity prices are higher, depending on their tariff and usage patterns.
At GLSR Solutions, we install solar battery storage systems from manufacturers including Fox ESS and Sigenergy.
The most suitable system depends on your electricity consumption, existing solar installation and what you’re looking to achieve.
Are solar panels still worth having in winter?
Although solar panels generate less electricity during winter, it’s important to consider their performance across the whole year.
A solar installation is a long-term investment designed to generate electricity through every season.
During spring and summer, higher generation can help offset the lower output experienced during autumn and winter.
The financial benefits of solar depend on several factors, including:
- The amount of electricity your system generates annually.
- How much of that electricity you use within your home.
- Your electricity import tariff.
- Whether you have battery storage.
- Any payments received for exporting surplus electricity.
- The initial installation cost.
Eligible homeowners may also receive payments for surplus electricity exported to the grid through the Smart Export Guarantee (SEG).
Rather than focusing on what solar panels generate during a single month, it’s more useful to understand their expected annual output and how that compares with your household’s electricity consumption.
How can you get the most from solar panels during winter?
There are several practical ways to make better use of your solar installation during the colder months.
1. Use electricity when your panels are generating
Where practical, running appliances such as washing machines and dishwashers during daylight hours can help increase the amount of solar electricity you use directly.
2. Monitor your solar generation
Most modern solar installations include monitoring software, allowing you to see how much electricity your panels are generating and how your household is using it.
3. Consider battery storage
A battery may help you use more of your own solar electricity, particularly during evenings. The financial benefit will depend on your usage and tariff.
4. Review your electricity tariff
Some electricity tariffs offer cheaper overnight electricity or export payments that can improve the overall economics of your system.
5. Understand your annual generation forecast
Winter output shouldn’t be viewed in isolation. Your system’s estimated annual generation provides a more useful picture of its potential performance.
Solar panel installation in Nottingham and the Midlands
If you’re considering solar panels for your home, understanding how they’ll perform throughout the year is an important part of making an informed decision.
At GLSR Solutions, we install solar PV systems, battery storage and EV charging solutions for homeowners across Nottinghamshire and the wider Midlands.
As an MCS-certified installer, we can assess your property and recommend a system based on your roof, electricity consumption and individual requirements.
Our process starts with an initial assessment of your property, using satellite imagery and solar design software to estimate the potential generation from your roof.
We can then arrange a home survey, discuss the options available and provide a tailored quotation.
Whether you’re looking to reduce your reliance on grid electricity, make better use of solar generation or explore battery storage, we’re here to help.
Thinking about installing solar panels?
Contact GLSR Solutions for a free solar assessment and personalised quotation.
