BrightGridSolar panels gradually lose some generating capacity as they age. This is known as degradation. Manufacturers normally provide performance warranties that specify expected output over a long period.
What is solar panel degradation?
Degradation means the panel's maximum electricity output gradually decreases over its operating life. It does not mean the panel suddenly stops working.
How do performance warranties work?
A performance warranty sets a minimum expected power level at specified points during the panel's warranty period.
Should degradation affect your buying decision?
- Compare the manufacturer's performance warranty.
- Review the expected degradation assumptions.
- Consider the panel's product warranty.
- Compare total system cost.
- Assess installer quality.
Do not compare panels using efficiency alone
Long-term performance, warranty conditions, dimensions and installation quality can be just as important as headline efficiency.
Frequently asked questions
Do solar panels lose efficiency over time?
Yes. Solar modules gradually degrade and produce slightly less electricity as they age.
How long do solar panels last?
Modern solar panels are designed for long-term operation and commonly have performance warranties covering many years.
Peter Wallace
Technical Director at BrightGrid Energy
