Grounding a photovoltaic inverter is a preparatory step before making electrical connections. Before connecting the inverter electrically, it is crucial to ensure that the inverter’s DC switch is in the “OFF” position, and the AC side disconnect is opened. Otherwise, the high voltage from the inverter could pose a life-threatening risk to the personnel involved.

Subsequently, each inverter should be independently installed with an AC circuit breaker. It is prohibited to use a single circuit breaker for multiple inverters. No load should be connected between the inverter and the circuit breaker. Also, the use of single-core wires at the output end of the inverter is not allowed.

Grounding For Pv Power Systems2

  1. Grounding Method for Household Photovoltaic Inverter Power Systems: Lightning Protection Grounding

AC side lightning protection typically consists of a fuse or circuit breaker and a surge protection device (SPD), primarily protecting against induced lightning, direct strikes, or other transient overvoltages. The lower end of the SPD is connected to the grounding bar of the distribution box.

Ungrounded Dc Grounded Ac

  1. Grounding Method for Household Photovoltaic Inverter Power Systems: Enclosure Grounding

According to the ‘Construction Quality Acceptance Specifications for Building Electrical Engineering’ 6.1.1, the metal frames and base steel of cabinets, screens, desks, boxes, and panels must be reliably grounded (PE) or connected to neutral (PEN). Doors capable of opening, containing electrical equipment, should be connected to the frame with a yellow-green copper wire. The door of the distribution box should be bridged to the cabinet body to ensure reliable grounding.