Winaico, part of Win Win Precision Technology, announced that its WSP PV modules had passed potential-induced degradation (PID) testing conducted by TÜV Rheinland. As pointed out by PV-Tech, “PID is regarded as a key problem for monocrystalline cells and modules as it reduces the high-level performance of the module”.
TÜV Rheinland’s testing of Winaico’s modules included a negative voltage of 1,000V applied to the modules at room temperature over 7 days (or 168 hours) with the module front covered and grounded with aluminium foil or a constant water film. If a module’s performance drops by less than 5% then it is considered as having passed the test. Winaico’s modules passed the test with a reduction of performance of less than 1%.
“The use of high-quality encapsulation materials and state-of-the-art plant technology at Winaico ensures a consistent production of PID-resistant modules. The positive test result gives certainty to Winaico customers, because the test confirms the nearly constant performance of the modules”, said Cheng-Lien Wang, production manager of Win Win Precision Technology.