Gary Custer, PE
Introduction
The gradual deterioration of performance in some PV modules with crystalline Si cells, known as Potential Induced Degradation (PID), can lead to a loss of up to 30% or more after a few years. While some module manufacturers are developing new materials to combat PID, the trend towards three-phase systems and higher system voltages up to 1,500 V is currently worsening the issue. This article provides an overview of the PID effect.
PID Cause: Potential to Earth & Voltage
To comprehend PID, one must begin by defining voltage and potential...
