What is Panel Degradation?
The gradual reduction in solar panel output over time, typically 0.3–0.5% per year.
Quick Answer
Ireland's moderate temperatures are actually beneficial for panel longevity — extreme heat accelerates degradation. Most panels installed in Ireland come with 25-year performance warranties guaranteeing at least 80–84% of original output. In practice, panels in Ireland's temperate climate often outperform these warranty minimums.
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
Panel Degradation Explained
Panel degradation is the gradual decrease in a solar panel's power output over its lifetime. All solar panels experience some degradation due to exposure to UV radiation, temperature cycling, and moisture. Modern panels degrade at approximately 0.3–0.5% per year, meaning after 25 years they still produce 87–92% of their original output. Degradation rates are guaranteed by manufacturers through performance warranties.
How Does Panel Degradation Work in Ireland?
Ireland's moderate temperatures are actually beneficial for panel longevity — extreme heat accelerates degradation. Most panels installed in Ireland come with 25-year performance warranties guaranteeing at least 80–84% of original output. In practice, panels in Ireland's temperate climate often outperform these warranty minimums.
Frequently Asked Questions
How much power will my panels lose over time?
Expect a loss of about 0.4% per year. After 25 years, your panels will still produce about 90% of their original output. Ireland's mild climate helps minimise degradation.
Related Guides
John Rooney is the founder of Solar Info and has been covering the Irish solar energy market since 2023. He fact-checks all content against official SEAI data and maintains relationships with SEAI-registered installers across Ireland.