If you’re thinking about switching to solar, one of the first questions is: how long do solar panels last?

After all, installing solar is an investment in your home, energy savings, and the environment. The good news is that modern panels are built to last decades, providing reliable electricity with minimal maintenance. At Welton Renewables & Electrical, we ensure every installation maximises longevity, efficiency and performance.

Average Lifespan of Solar Panels in the UK

On average, domestic solar panels last 25–30 years, and often longer if maintained properly. Even after this period, they usually continue generating electricity, though efficiency may gradually reduce.

Key points:

• Panels maintain 80–90% efficiency after 25 years
• High-quality panels can last 30+ years
• Proper installation and care extend lifespan

Reference: Energy Saving Trust – Solar Panels

Factors That Affect Solar Panel Lifespan

Quality of Materials

High-grade solar panels resist wear and weathering:

• Tempered glass protects against hail or debris
• Aluminium frames prevent corrosion and warping
• Quality cells maintain energy output longer

Installation Quality

Panels must be installed correctly to last. Poor mounting or wiring can reduce lifespan. Welton Renewables & Electrical ensures panels are secure, aligned, and optimised for your roof.

Environmental Conditions

UK weather can be unpredictable, but solar panels are designed to handle rain, wind, and occasional snow.

• Excessive shading may reduce efficiency
• Self-cleaning or coated panels last longer

Signs Solar Panels May Need Attention

Even durable panels benefit from monitoring. Look out for:

• Reduced electricity output
• Visible cracks or damage
• Loose wiring or corrosion

Regular inspections help maintain peak efficiency and prevent small issues from becoming costly problems.

How to Maximise Solar Panel Longevity

Simple steps can help your panels last longer:

• Annual inspections by a qualified installer
• Keep panels clean and free of debris
• Trim overhanging branches to avoid shading
• Maintain inverters according to manufacturer guidance

Following these tips can help your panels perform optimally for 30 years or more.

Do Solar Panels Lose Efficiency Over Time?

Yes, but it’s gradual. Most panels lose around 0.5–1% efficiency per year, meaning even after 25 years, they still operate at 80–90% of their original capacity.

Modern panels degrade slower than older ones, and most reputable brands offer performance guarantees.

Financial Benefits of Long-Lasting Solar Panels

Solar panels are more than just eco-friendly; they’re financially savvy:

• Reduce electricity bills by up to 50% per year
• Sell excess energy back to the grid
• Increase home value and energy efficiency

Reference: UK Department for Energy Security

FAQs – Solar Panel Lifespan

How long do solar panels last in the UK?
Typically 25–30 years, sometimes longer.

Do panels need replacement after 25 years?
Not immediately. They continue to produce electricity with slightly reduced efficiency.

Can lifespan be extended?
Yes, with regular cleaning, inspections, and proper inverter maintenance.

Does UK weather reduce longevity?
No, panels are built to withstand rain, wind, and occasional snow.

Why Choose Welton Renewables & Electrical?

With our experience and expertise, we ensure every solar installation is:

• Professionally installed for maximum lifespan
• Fully compliant with UK safety standards
• Maintained for long-term efficiency

We handle everything from survey to commissioning, giving homeowners peace of mind and long-lasting results.

Conclusion

So, how long do solar panels last?
With modern technology and professional installation, panels can provide decades of reliable energy while maintaining efficiency. Choosing Welton Renewables & Electrical ensures your investment is safe, efficient, and long-lasting. Start your solar journey today and enjoy clean, sustainable energy for years to come.