How Long Do Solar Panels Last? Lifespan & Degradation Guide
Last updated: February 1, 2026
Solar panel lifespan explained. Degradation rates by technology, factors affecting longevity, and when to consider panel replacement.
Modern solar panels are built to last 25-30+ years, with most manufacturers guaranteeing performance for 25-30 years. Degradation — the gradual loss of output over time — is the main factor limiting useful lifespan. In our database of 107 panels, annual degradation rates range from 0.25% (Maxeon Maxeon 7 470W) to 0.7% (Renogy 100W Portable Solar Panel). After 25 years, most panels still produce 80-90% of their original rated power.
Key Takeaways
- • Solar panels last 25-30+ years with minimal maintenance
- • Lowest annual degradation in our database: 0.25% (Maxeon Maxeon 7 470W)
- • N-type panels (TOPCon, HJT) degrade slower than PERC
- • First-year degradation (1-2%) is normal — called light-induced degradation (LID)
- • After 25 years, expect 80-90% of original output from quality panels
- • Inverters typically need replacement after 12-15 years (string) or last 25 years (micro)
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Frequently Asked Questions
When should I replace my solar panels?
Solar panels rarely need replacement within 25 years unless physically damaged. If panels are producing less than 80% of rated output and are out of warranty, replacement may be cost-effective — especially if newer, more efficient panels are available. Otherwise, panels that still produce useful power should be kept running.
What causes solar panels to degrade?
Degradation is caused by UV exposure, thermal cycling (daily heating/cooling), moisture ingress, and potential-induced degradation (PID). N-type cells (TOPCon, HJT) are less susceptible to light-induced degradation (LID) than P-type PERC cells, which is why they degrade more slowly over time.
Do warranties cover degradation?
Yes. Performance warranties guarantee that panels will produce at least 80-87% of rated power after 25-30 years. If output drops below the warranty threshold, the manufacturer must repair, replace, or compensate you. Product warranties (12-25 years) cover manufacturing defects separately.
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Last updated: February 2026