The Average Lifespan of a Solar Panel: What to Expect Over 25+ Years
Investing in solar energy is a long-term decision, and one of the most common questions homeowners ask is: how long will my solar panels last? The good news is that modern solar panels are built to be durable and reliable, with lifespans that extend well beyond two decades. Let’s explore how long panels really last, what affects their performance over time, and what you can expect from warranties.
How Long Do Solar Panels Last?
On average, most solar panels are designed to last 25 to 30 years. This doesn’t mean they suddenly stop working after that point. Instead, their efficiency gradually decreases, which is why solar panels often continue producing energy even after their official lifespan has passed. Many homeowners see their systems generating electricity for 35 years or more with proper care.
Understanding Degradation Rates
The key factor in a solar panel’s lifespan is its degradation rate. This refers to how much efficiency a panel loses each year. For high-quality Tier 1 solar panels, the degradation rate is typically 0.3% to 0.5% per year.
To put this into perspective:
After 10 years, a panel may still produce around 95% of its original output.
After 25 years, it will likely still deliver about 80–85% efficiency.
This gradual decline is factored into manufacturer performance guarantees, ensuring you can predict the system’s output well into the future.
The Role of Warranties
Most reputable solar panels come with two types of warranties:
Product Warranty – Covers manufacturing defects and usually lasts 10–15 years.
Performance Warranty – Guarantees a certain level of efficiency for 25 years or more, often promising at least 80% output at the end of that period.
These warranties provide peace of mind and highlight the manufacturer’s confidence in their technology.
Durability and Real-World Performance
Solar panels are designed to withstand harsh weather conditions, including heavy rain, wind, and even hail. Panels go through rigorous testing before reaching the market, ensuring they can perform in diverse environments. Regular cleaning and inspections can also extend their lifespan by preventing dirt, shading, or small faults from affecting performance.
Getting the Most Out of Your Solar Panels
To maximise the lifespan and efficiency of your solar system:
Schedule annual check-ups with a qualified installer.
Keep panels clean from dust, leaves, and debris.
Monitor system output to catch performance dips early.
With these steps, your solar panels can continue generating reliable, low-cost energy for decades.
When you invest in solar, you’re investing in a technology built for the long run. With an average lifespan of 25+ years, backed by strong warranties and robust performance, solar panels deliver exceptional value. And the best part? Even after decades of use, your panels will still be working—making solar one of the most durable and sustainable energy choices available today.
Get in touch today to start our journey together.
Stay committed!
Damien Frearson
