One of those common problems with solar panels is PID. PID or Potential Induced Degradation implies that the solar panels will degrade faster and due to this, cannot achieve the expected return over the course of 20 years. This process often occurs after 2 or 3 years and afterwards, the degradation will proceed fast.
To regenerate panels affected by PID and prevent the emergence of PID, iLumen developed in-house the PID box. What makes this PID Box so innovative, is that it works independently of the inverter and therefore can never damage the inverter.
Source: ilumen.beAdded: 16 June 2014