How Long Do Solar Panels Last in the UK?

Solar panels are a long-term investment. But how long do they actually last? And how can you make sure they keep working for as long as possible?

In this post, we will look at how long solar panels last in the UK, what affects their lifespan, and what to expect after 25 years.

What Is the Average Lifespan of Solar Panels?

Most solar panels come with a 25-year performance warranty. This means they are expected to still make 80 to 90 percent of their original power after 25 years.

Many panels keep working for 30 to 40 years. They do not suddenly stop, they just make a bit less energy each year. The Energy Saving Trust says most systems keep producing clean energy well beyond their warranty period.

What Is Degradation?

Degradation means a small drop in performance over time. It is normal and expected.

Most solar panels lose about 0.5 percent of their power each year. After 10 years, that means they still make about 95 percent of what they made when they were new.

This is why it is important to choose panels with a low degradation rate. The better the quality, the longer they last.

What Affects How Long Solar Panels Last?

Several things can impact how long your solar panels keep working well:

Panel quality: Cheap panels may not last as long or degrade faster.
Installation: Panels should be fitted securely and with proper wiring.
Weather: UK wind, rain and cold can wear systems over time if they are not protected.
Dirt and birds: Dust and bird mess block sunlight and reduce power.

Keep birds away using our Bird Proofing Guide.

How Long Do Other Parts Last?

While panels may last over 25 years, some other parts may need replacing sooner:

Inverters usually last 10 to 15 years.
Batteries last 5 to 15 years, depending on type and use.

These parts are still covered by warranty. Learn more in our Solar Panel Installation Guide.

Do I Need to Replace Solar Panels After 25 Years?

Not at all. If your panels are still making power, you can keep using them. Some people choose to upgrade to newer, more efficient models. Others simply add more panels to increase their savings.

The main sign your panels are aging is lower energy production. You can check this through your solar system monitoring tools.

How to Help Your Panels Last Longer

You can help your system last longer by:

Keeping the panels clean and free from bird nests
Checking for shade from new trees or buildings
Getting a service check every few years
Choosing a trusted installer from the start

See how solar stayed strong for over a decade in our Walton on Thames Case Study.

Final Thoughts

Solar panels are made to last. With good care, they can keep working well beyond 25 years.

Even when they start to make a little less energy, they are still helping you save on bills and reduce your carbon use.

Want to know how long solar could work on your home? Get a tailored quote from Solarsmith today. It is free and there is no pressure.