In photovoltaic power generation systems, inverters, as key equipment, play an important role in converting direct current into alternating current. Therefore, the wiring method of the inverter is crucial for the normal operation of the entire system. This article will provide a detailed analysis of the wiring methods of photovoltaic inverters to help readers better understand and apply them.

1、 Preparation work before inverter wiring

Before wiring the inverter, it is necessary to make sufficient preparations. Firstly, it is necessary to ensure that the photovoltaic power generation system has been disconnected from the power source to avoid the risk of electric shock. Secondly, it is necessary to prepare the necessary wiring tools and materials, including suitable cables, plugs, wiring terminals, etc. In addition, it is necessary to carefully read the user manual of the inverter, understand the wiring requirements and precautions of the inverter.

2、 DC side wiring method

The DC side wiring of the inverter mainly includes connecting the output line of the solar panel to the input port of the inverter. Firstly, connect the positive and negative poles of the solar panel to the "PV" and "PV -" ports of the inverter, respectively. During the connection process, pay attention to the identification of positive and negative poles to ensure correct connection. At the same time, it is necessary to ensure that the cross-sectional area of the cable matches the rated current of the inverter to avoid the risk of wire overheating or electrical fire.

In addition, if there are multiple solar panel strings in the system, they need to be connected in parallel according to the correct voltage level. During the connection process, attention should be paid to maintaining voltage balance between battery pack strings to avoid damage to the inverter caused by high or low voltage.

3、 AC side wiring method

The AC side wiring of the inverter is to connect the AC power output by the inverter to the power grid or load equipment. Firstly, connect the "AC" and "AC -" ports of the inverter to the grid terminal at the grid connection point. During the connection process, it is important to ensure that the connection sequence is correct so that the power grid can transmit the AC power output by the inverter.

Meanwhile, attention should be paid to the cross-sectional area and material selection of communication wires to ensure their safe load-bearing capacity and durability. When connecting to the power grid, it is also necessary to comply with local grid connection regulations and safety standards to ensure that the wiring meets relevant requirements.

4、 The function and connection sequence of key junction ports

During the wiring process of the inverter, special attention should be paid to the role and connection sequence of key wiring ports. PV and PV - ports are the input ports of the inverter, used to connect the output lines of the solar panel. When connecting, the PV should be connected first and then the PV -, ensuring the reliability of the circuit.

The AC and AC - ports are the output ports of the inverter, used to connect to the power grid or load equipment. When connecting to the power grid, it is necessary to ensure that the voltage and frequency of the grid connection point match the output of the inverter to avoid interference or damage to the power grid.

In addition, attention should also be paid to the connection of the grounding wire. The grounding wire is set up to ensure the safe operation of equipment and prevent electrical accidents. During the wiring process, the grounding wire should be firmly connected to the grounding terminal of the inverter and ensure that the grounding resistance meets relevant requirements.