The service life of a solar power storage systems is more than 25 years under the premise of that the equipment quality and installation process are standardized. Among them, grounding is a very important step. Improper grounding will cause an error due to the device’s low insulation resistance to ground or excessive leakage current, which will affect power generation and may even endanger personal safety. So, how should the photovoltaic power station be properly grounded?

Solar Module Grounding

Many people think that the solar module and brackets are both made of metal, which are in direct contact and conduct. As long as the bracket is grounded, there is no need to ground the solar module. In fact, the aluminum frame of the module and the galvanized bracket or the aluminum alloy bracket are all coated, which cannot meet the grounding requirements. Moreover, the module have aging problems, which may cause excessive leakage current or low insulation resistance to ground.

Inverter Grounding

Generally, the PE end is connected to the PE row in the distribution box, and then grounded through the distribution box. There is a grounding hole on the right side of the inverter body for repeated grounding to protect the safety of the inverter and operators.

Distribution Box Grounding

The lightning protection on the AC side is generally composed of fuses or circuit breakers and lightning surge protectors. It mainly protects induced lightning or direct lightning or other transient overvoltage surges.

The photovoltaic power station needs to do a good job of grounding the system from the module side, the inverter side, and the distribution box side, so as to reduce unnecessary operation and maintenance in the later stage, so as to ensure the stable, safe and efficient operation of the system.