Potential-induced degradation (PID) is a phenomenon that affects the ions of a solar cell and leads to a deterioration of the output power of that cell. PID can significantly reduce the output power of a photovoltaic module (PV) within the first year of operation, with module-level power losses potentially of up to 70% in the first 18 months. These module-level losses can progress rapidly and become so severe that they affect the performance of an entire system.
Anti-PID method for Delta inverters
- Operating time and conditions: During the night and without DC power
- Implemented method: There is a parasitic capacitance between a PV module and the grounding node. If there is no DC power after sunset, the anti-PID function starts after 30 minutes. The inverter provides a low current to charge parasitic capacitance between the negative node of a PV module and the grounding node in order to increase the positive potential. This helps to reverse the polarization effect that occurred during operation. This can help to more quickly recover the PV array affected by PID.
- Please contact the manufacturer of your solar module for more information on the duration and criteria for performing this function.
- Delta inverter models with anti-PID: M15A_220, M20A_220, M30A_230, M50A_260, M70A_260, M125HV, M250HV