How Long Do Solar Panels Last?
Solar is a long term investment, but how long do panels they last?
Author
Harry Dexter | Operations Director
Table of Contents
Author
Harry Dexter | Operations Director
Table of Contents
How Long Do Solar Panels Last?
Solar panels are a long term investment, but many ask the question – How long do they last?
Whether you’re considering solar for your home, business or an off-grid set up its vital that you understand the lifespan, what affects their durability and how they degrade over time. Within this blog we explore everything you need to know to understand how long solar panels last.
The Average Lifespan
Most modern solar panels are built to last 25 to 30 years or more. The vast majority of panels come with both a performance and product warranty. The performance warranty usually guarantees the panels to remain higher than 80-90% production capacity for 25 years. The product warranty covers any defects and failures, typically between 10 and 25 years.
However, panels do not simply stop working after 25 years. – it simply means that they output gradually decreases and may no longer be considered efficient enough for everyday use.
How Much Do Panels Degrade Over Time?
Panels degrade over time, which means they produce less electricity each year. This is known as Solar Panel Degradation Rate.
On average, panels degrade at a rate of between 0.5% to 0.8% per year, although more premium brands will degrade at a slower rate.
So after 25 years, a panel may still operate at around 75-88% of their original capacity.
Factors That Affect Lifespan
Panel Quality: Premium manufacturers (like SunPower or LG) often offer panels with longer lifespans and better warranties.
Installation: A properly installed system with good ventilation and secure mounting will age better.
Climate: Extreme temperatures, heavy snow, or hail can wear panels faster—though most are rigorously tested for durability.
Maintenance: Whilst they require little upkeep, periodic cleaning and inspection help maintain peak performance.
When Should You Look At Replacements?
You don’t necessarily need to replace them just because they’ve hit 25 years. If they’re still working efficiently and your energy needs haven’t changed, you can keep using them. But you might consider replacement if:
- Your system no longer meets your power needs.
- Output has dropped below a usable level.
- You want to upgrade to newer, more efficient technology.
Final Thoughts
Solar panels are designed to stand the test of time. With minimal maintenance, they can produce clean, renewable energy for decades. Even after 25+ years, many systems still function reliably—just with slightly reduced efficiency. That long-term performance makes solar one of the smartest and most sustainable investments available today.
Contact us today for a free no obligation quote and start your solar journey.
