Solar
How Long Do Solar Panels Last? Lifespan, Degradation and Warranties
Short answer
Quality solar panels commonly come with 25 to 30 year performance warranties and often keep producing beyond that at reduced output. Panels typically lose a small fraction of output each year. The parts that usually need replacing sooner are inverters and batteries, so plan for them in your budget.
Panels
Most manufacturers guarantee that panels will still produce a stated share of their original power after 25 years or more. Output declines slowly with age, commonly well under 1% a year. Quality, installation and climate all affect real life.
What wears out first
| Component | Typical life (indicative) | Notes |
|---|---|---|
| Panels | 25+ years | Check product and performance warranty |
| Inverter | About 8 to 15 years | Warranty often 5 to 10 years |
| Lithium battery | Several thousand cycles, often 8 to 15 years | Depends on depth of discharge and heat |
| Lead-acid battery | Often 3 to 6 years | Depends on type and care |
| Cables and mounting | 20+ years | Quality and UV rating matter |
Indicative only; read the datasheet and warranty for the exact product.
Two warranties to understand
- Product warranty: covers manufacturing defects, often 10 to 12 years or more on quality panels.
- Performance warranty: guarantees a minimum output level over 25 to 30 years.
- Workmanship warranty: your installer's guarantee on the installation. Ask for it in writing.
How to get the longest life
- Use reputable panels, inverters and batteries with local warranty support.
- Have proper mounting, cable protection, surge protection and earthing.
- Keep panels clean and batteries within recommended temperature and depth of discharge.
- Arrange yearly inspections.
Common questions
Do panels stop working after 25 years?
No. The warranty period ends but panels typically keep producing at reduced output.
What fails first in a solar system?
Usually the battery or inverter rather than the panels.
Does hail or storm damage panels?
Quality panels are tested against impact, but severe damage can occur. Check whether your insurance covers solar equipment.