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Adding its name to a growing number of PV module manufacturers that claim to have products not affected by potential induced degradation (PID) is Panasonic Corporation. Both internal and third-party testing were said to have indicated that in the case of HIT cells, the fact that both surfaces are transparent conductive layers and without corresponding insulating layers, unlike conventional c-Si cells, no degradation occurred.
According to Panasonic, one of the third-party tests carried out by Chemitox, tested unidentified HIT modules at 1,000 volts for 96 hours at a temperature of 60°C with 85% relative humidity.
Chemitox is said to be certified as a third party testing laboratory by the American Association for Laboratory Accreditation (A2LA) in accordance with ISO/IEC17025 as well as the outside related testing laboratory by Underwriters Laboratories.
Panasonic also said that it had not been aware of any incidences of PID having been reported from the European, US or Japanese markets and that various PID test operations have not revealed any PID characteristics.