Potential Induced Degradation (PID), which occurs in solar power systems, is a degradation phenomenon caused by a leak current due to a large potential difference occurring in the PV module frame and module circuit. PID is believed to be one factor for lowering the output of solar power systems, and it is said that humidity promotes this phenomenon.
ESPEC's PID Evaluation System measures the leak current by applying high-voltage current in a high temperature and humidity environment with high accuracy and excellent reproducibility so as to accurately evaluate this PID phenomenon. This system is essential in evaluating PV module degradation.