Combiner box: a key role in protecting energy conversion

Combiner box: a key role in protecting energy conversion

The combiner box is an important component of the photovoltaic power generation system. Its main function is to combine and distribute the direct current generated by the photovoltaic modules for subsequent connection to the inverter or other equipment. The combiner box is usually installed below the photovoltaic modules and connected to the photovoltaic modules through cables.

Working principle of the combiner box

The working principle of the combiner box mainly involves the connection and protection of the circuit. When the photovoltaic modules generate direct current, they are connected to the input port of the combiner box through cables. The circuit inside the combiner box will combine and distribute the direct current, and then output the combined direct current to the inverter or other equipment. During the combining process, the combiner box will monitor the current, voltage and power parameters of each photovoltaic string, and realize short-circuit protection, anti-reverse connection protection, overcurrent protection and other functions through the protection device.

Main functions of the combiner box

Combining function: The combiner box can connect the direct current generated by multiple photovoltaic modules in series to form a larger voltage output. This can increase the voltage level of the system, reduce current loss, and thus improve the efficiency of the system.

Monitoring function: The combiner box can monitor the current, voltage and power parameters of each photovoltaic string in real time. By monitoring these parameters, we can timely detect the faults or abnormal conditions of photovoltaic modules and ensure the normal operation of the system.

Lightning protection function: In the combiner box, lightning protection devices such as lightning arresters or surge protectors are usually installed. These devices can effectively prevent lightning strikes from damaging the photovoltaic power generation system and protect the safety of the system.

Short-circuit protection function: The combiner box also has a short-circuit protection function. When a short-circuit fault occurs in the photovoltaic string, the combiner box will automatically cut off the connection with the faulty string to avoid the expansion of the fault and protect the safety of the entire system.

Anti-reverse connection protection function: In order to prevent the positive and negative poles of the photovoltaic module from being reversed, the combiner box is usually equipped with an anti-reverse connection protection device. This can avoid equipment damage and safety accidents caused by reverse connection.

Overcurrent protection function: The combiner box can also set an overcurrent protection function. When the current in the photovoltaic string exceeds the set value, the combiner box will automatically cut off the current to protect the photovoltaic module and related equipment from damage.

Communication function: Some advanced combiner boxes also have a communication function, which can be connected to a monitoring system or a data acquisition system to achieve remote monitoring and control.