Panasonic HIT Modules Show PID Resistance


Panasonic Corp. says that recent test results have shown that the overall power output of its HIT solar power generating system does not degrade even when the system is operated with high system voltages under high temperature and high humidity.

The modules' high level of resistance to potential induced degradation (PID) has been verified by the results of tests conducted within and outside the company.

PID causes the power output of photovoltaic modules to be reduced when they are subjected to external factors, such as high temperature and humidity, under the condition that a high voltage is applied across the internal circuits and the grounded frame. PID can occur in high-temperature and high-humidity environments, where the system voltage is high.

During one of the third-party tests carried out by Chemitox Inc., HIT modules were subjected to 1,000 V for 96 hours at a temperature of 60 degrees C with 85% relative humidity. Panasonic HIT solar modules exhibited no sign of degradation under such conditions, the company says.

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