Solar Panel Warranties in the UK: Coverage, Duration & Upvolt Support

Investing in solar panel installation is a long-term decision for UK homeowners, and understanding solar warranties is key to protecting that investment. Warranties cover the performance and reliability of your solar components, helping to safeguard both energy savings and system lifespan.  In this article, we’ll explain the different types of solar panel warranties, what they include (and exclude), and how a reputable company like Upvolt supports you with comprehensive cover and ongoing maintenance requirements.

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Key Takeaways

• Solar panel warranties protect your system against defects, performance loss, and installation errors, ensuring reliable long-term output.
• Different components of your solar setup, modules, inverters, and batteries, each carry their own warranty periods and terms.
• Exclusions often include neglect, extreme weather events, and unauthorised repairs, making regular professional servicing essential.
• Choosing a trusted solar installer ensures your warranties remain valid and gives you access to quick, stress-free claims support.

What Is a Solar Panel Warranty?

Solar panel installations are built to last 25 years or more, but problems can occasionally arise from equipment defects, environmental wear, or installation errors. A strong warranty ensures your investment is protected, covering the cost of repairs or replacements and giving you confidence that your system will perform as promised for decades.

Product Warranty

A product warranty is provided by the manufacturer and protects against faults in the panels themselves. It guarantees that your modules will work as expected for a set period, usually between 10 and 25 years. Higher-end panels often come with longer warranties, and some companies, including Upvolt, offer 25-year product warranties as standard.

Product warranties typically cover:

• Protection against material or manufacturing defects
• Coverage for structural or hardware failures
• Repair or replacement of faulty modules

Performance Warranty

Even premium panels gradually lose efficiency, typically degrading by around 0.5–0.8% each year. A performance warranty guarantees that energy output will remain above a certain level over the system’s lifetime, often ensuring at least 80–90% of the original capacity after 25 years.

Upvolt provides panels with market-leading efficiency of up to 23.6%, placing them among the highest-performing residential systems in the UK. Each system is backed by a 30-year performance warranty, giving homeowners confidence that their panels will deliver reliable energy output and financial savings for decades.

Performance warranties typically cover:

• Guaranteed energy output levels (e.g., 90% at year 10, 80% at year 25)
• Replacement or compensation if performance falls below the warranty threshold
• Gradual efficiency loss within the agreed degradation rate

Workmanship Warranty

Panels also rely on expert installation. A workmanship (or installation) warranty is offered by your installer and protects against errors during fitting, such as wiring faults, water damage from roof penetrations, or poor system integration. These warranties usually last 5–10 years, though some companies offer longer coverage or include it as part of maintenance packages.

All Microgeneration Certification Scheme (MCS) certified installers, like Upvolt, are required to offer a minimum 2-year workmanship warranty and an insurance-backed guarantee to protect customers in case the company goes out of business.

Workmanship warranties typically cover:

• Incorrect or faulty wiring
• Water damage from roof penetrations
• Poor or unsafe system integration
• Labour costs for corrective work

Warranty Coverage for Different Solar Components

When investing in a solar PV system, it’s important to understand how warranties apply to each part of your setup. Since different system components are built to last for varying lengths of time, the coverage period can differ. Here’s what you can typically expect:

Solar Panel Warranties

Solar panels are the most durable part of the system and usually come with warranties lasting 20–25 years. These cover:

• Gradual power output degradation
• Material or manufacturing defects
• Workmanship-related issues

Inverter Warranties

Inverters are more complex than panels and tend to have shorter warranties, typically 5–12 years, with options to extend up to 25 years, depending on the inverter model. Coverage reflects the fact that inverters include sensitive electronics and require more regular maintenance.

Inverter warranties typically cover:

• Repair or replacement of defective inverters
• Faults caused by manufacturing or material defects
• Failure of electronic components such as capacitors or circuit boards
• Labour costs for authorised repairs (depending on the manufacturer)
• Shipping costs for replacement units (in some cases)

Battery Warranties

Battery warranties typically range from 10–15 years, depending on the manufacturer and how the system is used. They are often linked to the number of charge and discharge cycles or total energy throughput the battery can deliver before its capacity begins to decline.

What's Not Covered By Solar Warranties

While solar warranties provide valuable protection, they don’t cover every possible issue. Clarity on exclusions reduces the risk of unexpected costs and helps you make the most of your warranty.

Maintenance Responsibilities

Even the longest warranty won’t protect against neglect. To keep your coverage valid, solar panels need regular professional inspections and occasional cleaning. Staying on top of these steps prevents small issues from becoming costly problems.

• Missing annual or scheduled professional checks
• Allowing dirt, leaves, or debris to build up and block sunlight
• Ignoring minor cracks or wear that later leads to bigger failures

Most manufacturers recommend inspections every 4–5 years, while others advise annual servicing if your system is exposed to harsher conditions. For cleaning, a basic wash once or twice a year with a soft brush and purified water is usually sufficient if panels are accessible and deposits are light. On hard-to-reach roofs or in areas with heavy fouling, it’s best to arrange professional cleaning to keep your panels, and your warranty, in good standing.

Extreme Weather and Accidental Damage

Warranties are designed to cover defects and performance issues, not damage from unexpected external events. Most policies exclude what insurers call “acts of God”, natural or accidental forces beyond the manufacturer’s control.

• Severe storms, hail, or lightning strikes
• Flooding or fire
• Physical impact, mishandling, or accidental breakage

If your panels are damaged by these events, the costs are usually covered under home or building insurance rather than the solar warranty.

DIY Repairs and Unauthorised Work

It might be tempting to try fixing a fault yourself, but even small unauthorised changes can instantly void your warranty. Solar systems are complex and must be handled by trained professionals. Using certified professionals protects your warranty and makes sure the system is installed and serviced correctly.

How to Compare Solar Panel Warranties Before You Buy

The warranty behind your solar panels is just as important as the panels themselves. A strong warranty protects your investment, ensures long-term performance, and can save you thousands in unexpected costs. Taking the time to compare warranty details before you buy ensures your system is protected for the long term.

When reviewing warranties, pay close attention to these key factors:

• Duration of coverage: How long materials, workmanship, and performance are protected
• What’s included: Specific repairs, replacements, and defects covered
• Performance guarantees: Minimum power output and acceptable degradation rates
• Installer or manufacturer reputation: Reliability in honouring claims and long-term support

Tip: Look beyond the initial upfront cost. Panels with limited warranties can lead to higher long-term costs, while comprehensive coverage from a reputable manufacturer and installer provides lasting value and protection.

How to Claim on a Warranty

If your solar panel system develops a fault, understanding the claims process will help you resolve the issue quickly and avoid unnecessary stress. Most manufacturers and installers follow a similar process, though exact requirements can vary.

1. Gather Documentation: Collect your installation certificates, warranty papers, performance records, photos of the issue, and any maintenance history.
2. Contact Your Installer or Manufacturer: Report the problem with a clear description, share your documentation, and request a professional inspection if needed.
3. Verify Warranty Coverage: Check the warranty terms, confirm the issue isn’t excluded (e.g., weather damage), and understand wear and tear limitations.

Some warranties require an authorised inspection before a claim can be processed. Once confirmed, repairs or replacements will usually be arranged under the warranty terms.

Upvolt's Warranty Support

When you invest in solar, a strong warranty is just as important as the panels themselves. At Upvolt, we go further than most installers by combining market-leading warranties with expert aftercare and advanced monitoring.

Trusted Manufacturer Partnerships

We work only with global manufacturers that meet the highest standards of quality and reliability. Every product we install is backed by robust warranties and tested for long-term performance. Our selection process prioritises:

• Proven durability and efficiency
• Rigorous quality control
• Transparent warranty terms
• Long-term customer satisfaction

Expert Installation and Maintenance

Your system is planned, installed, and commissioned by Upvolt’s in-house engineering team, ensuring everything is fitted correctly and remains compliant with warranty requirements. We also offer ongoing maintenance to keep your system performing at its best.

Customer Aftercare and Skygateâ„¢ Monitoring

Our support doesn’t stop once your panels are on the roof. With Skygate™, our advanced monitoring platform, you can track system performance in real time and receive proactive alerts if issues arise. This allows us to act quickly, helping to keep your panels efficient and your warranty valid.

Our aftercare programme includes:

• Continuous performance monitoring
• Automated alerts for servicing or faults
• Fast and straightforward warranty claims
• Direct access to expert support when you need it

With Upvolt, you’re not just purchasing solar panels, you’re gaining a long-term partner dedicated to protecting your investment and maximising your energy savings.

Let's Recap

Solar panel warranties are a critical part of protecting the lifespan of your solar modules and ensuring your system performs as expected. A clear understanding of warranty coverage, exclusions, and maintenance requirements helps you avoid costly surprises and keep your system in peak condition.

A comprehensive warranty strategy should include:

• Product coverage for solar modules against defects and faults
• Performance guarantees that protect long-term energy output
• Workmanship warranties tied to your solar installer’s expertise
• Clear understanding of what is excluded, such as extreme weather or unauthorised repairs

Partnering with a reputable company like Upvolt means you get more than standard protection. You benefit from trusted manufacturer partnerships, professional installation, ongoing servicing, and Skygateâ„¢ performance monitoring. Together, these ensure your warranty remains valid and your system continues to deliver strong results year after year.

About Upvolt

Upvolt is a trusted solar installer dedicated to helping homeowners across the UK transition to clean, reliable energy. We design and install tailored solar panel and battery storage systems that match your property, energy needs, and financial goals. Every project is carefully planned to maximise efficiency, system lifespan, and long-term savings.

Our in-house engineering team manages the entire process, including design, planning permissions, installation, and maintenance. With Skygateâ„¢, our advanced monitoring platform, you can track system performance in real time and receive proactive alerts to keep everything running at peak efficiency.

Get in touch today for a free quote and see how much you could save with solar energy.

FAQ

What types of warranties do solar panels typically come with?

Most solar panels come with a warranty that includes three main types: a product warranty (covering defects and faults in the solar modules), a performance warranty (guaranteeing energy output over time), and a workmanship warranty (protecting against installation errors). Together, these provide layered protection for your solar investment.

What do solar panel warranties usually cover?

Solar panel warranties are designed to give homeowners peace of mind. They typically cover issues such as manufacturing defects, premature performance loss, and installation problems. Some warranties also include labour and replacement costs, depending on the manufacturer and installer.

What might void a solar panel system warranty?

Common reasons for voiding a solar warranty include neglecting regular maintenance, damage caused by extreme weather, DIY repairs, or using uncertified technicians for installation or servicing. Following the maintenance requirements and using a reputable installer keeps your warranty valid.

How do I make a warranty claim?

To make a warranty claim, gather all relevant documentation (installation certificates, warranty papers, performance data, and photos), then contact your installer or manufacturer. They may require a professional inspection before approving the claim and arranging repair, replacement, or compensation.

What should I look for when comparing solar panel warranties?

When comparing warranties, pay close attention to coverage duration, specific defects or failures included, performance guarantees, and the reputation of the manufacturer or solar installer. Strong warranties not only protect your solar modules but also reduce long-term costs and give you confidence in your investment.

Alex Lomax

CEO & Co-Founder

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