Solar panels are supposed to last 25 years and beyond.
It is hence important that they get tested fully before they are shipped to the market.
A wide range of tests are performed on solar panels by independent testing companies such as UL and TuV.
Based on these tests, the panels are provided specific certifications based on IEC standards. Many module makers go beyond what has been prescribed by IEC, both in terms of the types of testing, as well as the rigour with which the tests are done.
Details of some of the tests carried out by the panel makers are given below.
Standard IEC / UL testing
Light soak stabilisation
Repeated challenge testing
Fire resistance testing
Salt mist testing
Evaluation of c-Si and thin-film PV technologies
Potential Induced Degradation (PID)
Other non-standard testing
Here are some interesting links that provide more details of testing done for solar panels
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