Understanding Solar Panel Warranties: Key Considerations

By Josh Roberts
July 3, 2024

As solar energy becomes an increasingly popular choice for homeowners and businesses alike, understanding the ins and outs of solar panel warranties has never been more crucial.

These warranties are your safeguard, ensuring that your investment in renewable energy is protected over the long term.

In this article, we’ll break down everything you need to know about solar panel warranties, from the different types available to what to look for when evaluating your options.

What is a Solar Panel Warranty?

A solar panel warranty is a guarantee provided by the manufacturer or installer that promises the solar panels will perform as expected for a certain period.

This assurance covers potential defects, performance issues, and sometimes even installation problems.

Understanding the nuances of these warranties can help you make a more informed decision when purchasing solar panels.

Types of Solar Panel Warranties

Performance Warranty

The performance warranty guarantees that your solar panels will maintain a certain level of efficiency over a specified period.

Solar panels naturally degrade over time, losing efficiency slowly each year.

A typical performance warranty might guarantee that the panels will still produce 80% of their original power output after 25 years.

It’s crucial to look for warranties that offer a gradual decline in performance rather than a sudden drop.

Product Warranty

The product warranty covers manufacturing defects and failures in materials or workmanship.

This type of warranty usually lasts between 10 to 25 years, depending on the manufacturer.

If your panels have issues like cracking, corrosion, or other physical defects, the product warranty ensures these problems will be addressed.

Service Warranty

The service warranty, often provided by the installer, covers issues related to the installation process.

This includes any mistakes made during installation that might affect the performance or safety of the solar panel system.

These warranties are typically shorter, ranging from 1 to 10 years.

Key Components of a Solar Panel Warranty

Duration and Terms

When evaluating a solar panel warranty, the duration is one of the most critical factors.

Most reputable manufacturers offer warranties that last between 10 to 25 years.

A longer warranty is generally better, but it’s also essential to understand the terms and conditions that come with it.

Some warranties might have specific clauses that could affect their duration, such as regular maintenance requirements or geographic limitations.

Performance Guarantees

Performance guarantees are a vital part of any solar panel warranty.

These guarantees outline the expected degradation rate of the panels.

For instance, a linear performance guarantee promises a steady decline in efficiency over time, which is preferable to a step performance guarantee where the decline occurs in abrupt stages.

Understanding these guarantees can help you predict the long-term efficiency of your solar panels.

Coverage Scope

The scope of coverage refers to what exactly the warranty will cover.

It’s essential to scrutinise the fine print to understand what’s included.

Generally, product warranties cover defects in materials and workmanship, while performance warranties cover efficiency losses.

Some warranties might also include labour costs for repairs or replacements, but this isn’t always the case.

Exclusions and limitations can vary widely, so it’s vital to be aware of them.

Factors to Consider When Evaluating a Solar Panel Warranty

Manufacturer Reputation

Choosing a reputable manufacturer can make a significant difference in the reliability of your warranty.

Well-known manufacturers are more likely to honour their warranties and provide better customer support.

Researching and evaluating manufacturers involves looking at their track record, reading customer reviews, and checking industry ratings.

Warranty Transferability

If you plan to sell your property, it’s crucial to know whether the solar panel warranty is transferable to the new owner.

Transferable warranties can enhance the resale value of your property.

Most manufacturers allow transfers, but there might be specific conditions, such as a transfer fee or notification within a particular timeframe.

Service and Support

The quality of customer service and support can significantly impact your warranty experience.

Efficient and responsive support makes the process of making claims much smoother.

Before purchasing, find out how to access support and what the typical process is for making a warranty claim.

Good manufacturers provide clear, easy-to-follow procedures.

Cost vs. Value

While it might be tempting to choose the cheapest option, balancing cost with warranty coverage is essential.

A comprehensive warranty might come at a higher initial cost but can save you significant money in the long run by covering potential repairs and ensuring long-term performance.

Consider the long-term benefits and overall value rather than just the upfront price.

Common Warranty Issues and How to Avoid Them

Understanding the Fine Print

One of the most common issues with warranties is not fully understanding the terms and conditions.

Reading the fine print can help you avoid unpleasant surprises.

Look out for clauses related to maintenance, geographic limitations, and exclusions.

Knowing these details upfront can help you maintain your warranty and avoid actions that might void it.

Maintaining Your Warranty

Regular maintenance is often a requirement to keep your warranty valid.

This can include periodic cleaning, inspections, and ensuring that no physical damage occurs.

Failing to perform these tasks might void your warranty, so it’s essential to follow the manufacturer’s guidelines.

Steps to Take if You Need to Make a Warranty Claim

Documentation and Proof

When making a warranty claim, having detailed documentation can be incredibly helpful.

Keep all receipts, records of maintenance, and any communication with the manufacturer or installer.

This documentation serves as proof of your claim and can speed up the process.

Contacting the Manufacturer or Installer

If you encounter an issue, the first step is to contact the manufacturer or installer.

Provide them with all the necessary documentation and be clear about the problem.

They will guide you through the claims process, which typically involves an inspection and, if valid, repair or replacement of the faulty panels.

The Future of Solar Panel Warranties

Trends and Innovations

The solar industry is continually evolving, and so are the warranties.

Emerging trends include longer warranty periods and more comprehensive coverage as technology improves.

Some manufacturers are also offering innovative solutions like remote monitoring and proactive maintenance services.

Consumer Advocacy and Rights

Consumer advocacy plays a crucial role in improving warranty standards.

Staying informed about your rights and the latest industry developments can help you make better decisions.

There are resources available that can provide guidance and support if you encounter issues with your warranty.


Understanding solar panel warranties is key to making an informed decision and protecting your investment.

By knowing what to look for and carefully evaluating your options, you can ensure that your solar panels will provide reliable, long-term performance.

Remember to consider the reputation of the manufacturer, the scope of coverage, and the fine print of the warranty terms.

With this knowledge, you can confidently navigate the world of solar energy.


What is a solar panel warranty?

A solar panel warranty is a guarantee provided by the manufacturer or installer that covers defects and performance issues over a specified period.

How long do solar panel warranties typically last?

Most solar panel warranties last between 10 to 25 years, depending on the manufacturer and type of warranty.

What is covered under a performance warranty?

A performance warranty guarantees that the solar panels will maintain a certain level of efficiency over time, typically promising a specific percentage of original power output after a set number of years.

Can solar panel warranties be transferred to a new owner?

Many solar panel warranties are transferable, but this often involves specific conditions, such as notifying the manufacturer within a certain timeframe and possibly paying a transfer fee.

What should I look for when choosing a solar panel warranty?

Look for a reputable manufacturer, a comprehensive warranty duration, clear performance guarantees, and good customer service.

Also, check the fine print for any exclusions or limitations.

How do I make a warranty claim for my solar panels?

Start by contacting the manufacturer or installer with all necessary documentation, including receipts and maintenance records.

They will guide you through the claims process.

What are common exclusions in solar panel warranties?

Common exclusions include damage from environmental factors, improper installation, and lack of regular maintenance.

How can I maintain my solar panel warranty?

Regular maintenance, such as cleaning and inspections, is crucial.

Follow the manufacturer’s guidelines to ensure your warranty remains valid.

Why is the reputation of the manufacturer important for warranties?

Reputable manufacturers are more likely to honour their warranties and provide better customer support, ensuring a smoother claims process.

What future changes can we expect in solar panel warranties?

Future changes may include longer warranty periods, more comprehensive coverage, and innovations like remote monitoring and proactive maintenance services.

Related guides:

As you consider investing in solar panels, it’s essential to understand the complete installation process. Check out our guide on the ultimate guide to solar panel installation to ensure you’re fully prepared.

For more information on how to choose the best panels for your needs, read our article on how to choose solar panels.

If you’re curious about the expected output of a solar system, you might find our guide on what should a solar system generate per day in the UK particularly useful.

To understand more about the long-term value and durability of solar panels, take a look at our discussion on how long do solar panels last.

Lastly, if you’re thinking about enhancing your solar system with battery storage, our guide to solar panel batteries offers comprehensive insights.