How long do solar panels last?
Solar panels last 25 to 30 years or more, and most carry a performance warranty guaranteeing around 85% to 90% of their original output at year 25. They keep generating beyond that at a slowly declining rate. The inverter is the part most likely to need replacing once over the system's life, typically after 10 to 15 years.
Component lifespans
| Component | Lifespan | Notes |
|---|---|---|
| Panels | 25 to 30+ years | Slow ~0.5%/year output decline |
| Inverter | 10 to 15 years | Usually one replacement (£800 to £1,500) |
| Battery | ~10 years (warranty) | Retains most capacity over the term |
| Mounting | 25+ years | Designed to outlast the panels |
Getting the full lifespan
Quality panels, a good inverter and proper MCS installation are what deliver the full 25-plus years. Because payback is typically 6 to 10 years, the system spends most of its life generating effectively free electricity after it has paid for itself.
Frequently asked questions
- Do solar panels suddenly stop working?
- No. They degrade slowly, around 0.5% a year, and keep generating well past their 25-year warranty period.
- What is the first thing to fail?
- Usually the inverter, which works hardest and is commonly replaced once at around 10 to 15 years.
Related questions
Indicative estimates based on UK average data. Last updated 27 May 2026.