Is it worth installing solar panels in winter? Solar energy doesn’t understand seasons

Solar panels also work in winter

Photovoltaic solar energy doesn’t depend on heat but on light. Panels capture sunlight —even on cloudy days— and convert it into electricity. Although solar radiation is lower in winter and there are fewer daylight hours, systems continue to produce energy. In fact, cold weather can actually boost panel performance, since high temperatures in summer can reduce efficiency.

Panels are also designed to withstand adverse weather conditions such as rain, wind, or snow. In areas with harsher winters, adjusting the panel tilt is recommended to help snow slide off instead of accumulating. And if it rains —even better: rain helps keep panels clean, improving their performance.

How much energy is produced in winter?

Solar generation in winter can be 30% to 50% lower than in summer, depending on geographic location, roof orientation, and weather conditions. But that doesn’t mean the installation isn’t profitable. What really matters is the annual balance: solar panels generate energy year-round, while the savings add up month after month.

If your system is connected to the grid, you can also benefit from excess energy compensation. In other words, the surplus you generate in spring and summer can offset what you don’t produce during the colder months.

Advantages of installing solar panels in winter

Many people assume summer is the best time to install solar panels, but doing it in winter has several advantages:

1. Be ready for peak generation season

Installing in winter means your system will be fully up and running by spring, when solar generation skyrockets. You’ll benefit from the most profitable months from day one.

2. Installers are less busy

Demand for installations is generally lower in winter. This translates into greater installer availability, shorter timelines, and more personalised service.

3. Access to active tax deductions

Public incentives for self-consumption are available all year long. Installing in winter gives you the chance to secure funding before budgets run out or calls for applications close.

4. Savings from day one

Even if electricity generation is lower, your electricity bill will start dropping the moment your panels become operational. And if you combine solar panels with batteries, you can store energy to use it when you need it most.

Is it cheaper to install in winter?

Not necessarily, but it can be more efficient. Some companies offer seasonal promotions to encourage installations during low-demand months. Moreover, by avoiding the summer rush, you may get faster installation times and better material availability.

What should you consider before installing?

• Request a personalised assessment: it should analyse your consumption, roof orientation, and energy needs.
• Choose a certified, trusted installer: make sure they offer warranties on both products and services.
• Check available subsidies: look into regional, national, or EU programmes that can help reduce your installation costs.
• Consider excess energy compensation: verify whether your energy retailer allows you to sell or offset surplus generation.