Solar panels are typically warrantied for 25 years, but that's a performance guarantee, not an expiry date.
What actually happens over time
- Panels lose roughly 0.5–0.8% output per year.
- Most panels still work well past year 25, just at reduced output.
- Inverters usually need replacement once, around year 12–15.
"A panel doesn't stop working at 25 years — it just isn't guaranteed anymore."
| Year | Typical output |
|---|---|
| Year 1 | ~98% |
| Year 25 | ~80–85% |
This degradation math matters for ROI calculations. Read the full breakdown in Solar Panel Degradation Explained.