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Solar panels can keep generating electricity for decades, but output gradually falls over time. Here’s how long they last, when parts may need replacing and how to tell if your system is still performing well
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Solar panels are a long-term investment, so it’s natural to want to know how many years you’ll get out of them before performance starts to drop or replacement becomes necessary.
Most modern solar panels are designed to keep generating electricity for decades, but their output will gradually decline over time. However, that doesn’t mean they suddenly stop working at the end of their warranty. In many cases, panels can continue producing usable electricity well beyond 25 years, although at a lower level than when they were first installed.
How long your solar panels last will depend on the quality of the panels, how well they were installed, the weather they’re exposed to and whether other parts of the system, such as the inverter or battery, need replacing sooner.
This guide explains the typical lifespan of solar panels in the UK, what affects their performance, when you might need to replace them and how to get the most from your system. And if you’re still deciding whether to install them, our guides to the best solar panels and the cost of solar panels can help you compare your options before you buy.
Use our comparison tool to get free quotes from leading solar panel installers.
Most modern solar panels are designed to last 25 to 30 years, and many continue producing electricity beyond that. That does not mean they suddenly stop working after 25 years. Instead, their performance gradually declines as the panels degrade over time. A good rule of thumb is that modern panels lose around 0.3 to 0.5 per cent of output per year, which means many will still generate roughly 85 to 90 per cent of their original capacity after 25 years, depending on the brand and model.
Manufacturers usually back this up with long performance warranties, often lasting 20 to 30 years, alongside separate product warranties that cover manufacturing defects. The panels themselves are built for the long term, but other parts of the system may need attention sooner. In particular, the solar inverter often has a shorter lifespan and may need replacing after around 10 to 15 years, making it one of the main long-term maintenance costs to factor in.
You don’t need to replace solar panels simply because they are old. If they are still safe and producing a useful amount of electricity, they may continue to help reduce your bills for years after their original warranty period.
Replacement is more likely to make sense if the system has a major fault, output has dropped significantly, or you are already carrying out roof work that requires the panels to be removed.
It’s also worth comparing the cost of repairs with the likely benefit of newer panels. Solar panel efficiency has seen a dramatic rise since the technology’s inception, improving from about 6% in the 1950s to over 22% for the best commercial panels in 2026, with laboratory cells exceeding 47% efficiency. This tenfold increase in efficiency has been a key driver in making solar energy a mainstream, cost-effective renewable power source.
As solar technology has improved over time, a modern system may generate more electricity from the same amount of roof space. However, replacing working panels early isn’t always the most economical or sustainable option.
A professional inspection can help you decide whether to repair, replace individual components or upgrade the full system. The part more likely to need earlier replacement is the solar inverter, which typically lasts around 12 years rather than the full life of the panels.
In many solar panel systems, the inverter is more likely to need replacing before the panels themselves. The inverter converts the direct current electricity produced by your panels into alternating current electricity that can be used within your home. While solar panels can often last 25 years or more, inverters typically have a shorter lifespan.
If your system suddenly stops generating electricity, or your monitoring app shows a fault, it does not necessarily mean the panels have failed. The inverter, wiring, isolator switches or monitoring equipment could be the issue instead.
Some inverters include online monitoring, which can alert you if the system stops working. It is worth checking the inverter warranty when you install solar panels, as some warranties can be extended. Your installer should also be able to advise whether a failing inverter can be replaced without changing the panels.
Solar panels don’t usually stop working suddenly at the end of their warranty. Instead, their output gradually declines over time, a process known as degradation.
This means a panel that generated a certain amount of electricity when it was first installed will typically produce a little less each year. The drop is usually small, but over the lifetime of the system, it affects how much electricity your panels can generate and how much you may save on your bills.
For many modern solar panels, degradation is often measured in fractions of a percentage point each year. However, the exact rate will depend on the panel type, build quality, installation, weather exposure and how well the system is maintained.
This is why warranties often refer to performance as well as product defects. A panel may still be working after 25 years, but the manufacturer may only guarantee that it will still produce a certain percentage of its original output by that point.
A solar panel warranty usually covers two main things: product defects and long-term performance. The product warranty covers faults in the panel itself, such as manufacturing or material defects, while the performance warranty guarantees that the panel will still produce a minimum level of electricity after a set number of years.
In the UK, many solar panels are imported, so if something goes wrong, the claim is often handled through your installer or supplier rather than directly with the overseas manufacturer.
The performance side of the warranty is especially important because all solar panels degrade gradually over time. Many modern panels lose around 0.3 to 0.5 per cent of output per year, though premium models can perform better. That is why many standard performance warranties promise around 80 to 90 per cent of original output after 25 years, while some premium panels guarantee as much as 92 per cent at that point.
If your panels fall below the output level promised in the warranty, you may be entitled to a repair, replacement or compensation, depending on the terms.
In short, a good warranty provides peace of mind that your investment will deliver reliable, long-term performance, even if your panels were made thousands of miles away.
A noticeable drop in output is your best clue that all is not well, and you will see that in higher bills and lower payments for the power you sell to the grid. It is unlikely that power output will drop to zero because of faulty panels unless something has fallen on them. If your output collapses, your inverter or another key part of the system may be at fault.
In many cases, nothing needs to happen immediately. If your solar panels are securely fitted, safely wired and still generating useful electricity, they may be able to remain on your roof beyond 30 years.
However, their output is likely to be lower than when they were first installed. At that point, the decision is usually less about whether the panels still work and more about whether they are still worth keeping.
You may want to consider replacing your solar panels if:
Before replacing an older system, ask a qualified installer to check the panels, inverter and roof fixings. In some cases, a repair or inverter replacement may be more cost-effective than replacing the whole system.
Yes, solar panels can be recycled, but they should not be treated as ordinary household waste.
In the UK, photovoltaic panels are classed as electrical and electronic equipment, which means they fall under waste electrical and electronic equipment rules. If your panels are being removed or replaced, speak to your installer, supplier or manufacturer about the correct recycling route.
Solar panels contain materials such as glass, aluminium, silicon and metals that can often be recovered. The key is to make sure old panels are handled through an approved route rather than being sent to landfill.
Yes. The warranty covers you if the solar panels are defective or don’t deliver the power output you have been promised, but if a tree falls on them, the manufacturer will not cover their replacement.
Most home insurance policies now cover solar panels, so make sure to check that yours does too, and to tell your home insurer that you have them.
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