Paidong Industrial Zone Qiligang,Yueqing City,Zhejiang province,China.
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    11 Feb, 2023
    Posted by elcb_admin
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    Solar Combiner Box: Study Guide

    What is a solar combiner box?

    The solar combiner box is like a junction box, which combines all the outputs from the solar panels into one line, and then uniformly inputs into the inverter, which reduces the number of wires and saves material costs. The basic components in a solar PV combiner box include PV string fuses, DC molded case circuit breakers, and DC surge protection devices. There is also other additional equipment, such as monitoring devices.

    Depending on the environment and conditions of use, the solar combiner box also has a variety of specifications and sizes. It is necessary to fully understand the functions of the components in them in order to choose and match the ideal product.

    Appearance of Solar PV DC Combiner Box
    The Appearance of Solar PV Combiner Box

    Before delving into the details of solar combiner boxes, we also need a brief understanding of photovoltaic systems: Photovoltaic systems, also known as photovoltaic systems or solar power systems, are electrical systems designed to provide usable solar energy through photovoltaic power generation.

    Why do you need a solar combiner box?

    Because one of the functions of the solar combiner box is to integrate excessive wires. Basically, in the case of fewer than 4 strings, the combiner box is not necessary. But the solar combiner box also has other functions, such as:

    1. Strengthen the protection of rear equipment, such as inverter
    2. It can be disconnected quickly when the current has surge fluctuations
    3. Unified management of all front-end solar battery packs

    If you have a need for the above functions of the solar PV combiner box, then you need to understand and purchase this product.

    Solar DC PV Combiner Box
    Solar PV Combiner Box

    What's Inside a Solar Combiner Box?

    The basic components in the solar combiner box are as follows:

    DC Molded Case Circuit Breaker

    DC molded case circuit breakers can be used to protect circuits in solar power generation systems. The rated current of the Tongou DC molded case circuit breaker is between 63A and 630A, which is suitable for higher-power photovoltaic systems.

    TOSM8DC-125 125A DC MCCB
    TOSM8DC-125 125A DC MCCB

    PV String Fuse

    The photovoltaic string fuse will blow the fuse in the event of an accident, preventing the reverse current from continuing to flow, and protecting cables and other equipment from further damage.

    Solar PV String Fuse for Solar Power System TOWFH1DC-30
    TOWFH1DC-30 Solar PV String Fuse

    DC Surge Protection Device

    When there is transient overvoltage on the protected line, the surge protector will conduct the surge into the ground to protect the rear equipment from the surge.

    DC Electrical Surge Protector SPD TOWSP-DC2/2/C40 For House
    TOWSP-DC2 DC Surge Protector SPD

    What to pay attention to when buying a solar combiner box?

    First of all, we need to determine where the purchased combiner box is used, what configuration it needs, and purchase it as needed.

    Want simple or feature-rich? Because of the installation location, do you need a large box or a small box? Is the combiner box mounted on the wall or placed on the floor? Basically, each manufacturer does not necessarily have a ready-made combiner box suitable for each situation. When the situation is complicated, the combiner box needs to be customized to meet the needs.

    In order to facilitate subsequent maintenance, you can install monitoring equipment on the combiner box. After installing the monitoring equipment, the voltage, current and even temperature in the combiner box can be monitored remotely, and faults can be found in time so that they can be repaired in time.

    Secondly, for the combiner box itself, we need to pay attention to the following points:

    shell quality

    Because the combiner box is a product that needs to be used for a long time. If the quality is not good, a frequent replacement will only increase the cost in the end.

    Internal Component Quality

    Every country has more or less different product standards, so make sure that the products you choose and buy meet your local requirements and regulations.

    shell adaptability

    The use environment of solar combiner boxes will vary from place to place, and a good quality solar combiner box can be compatible with different environments.

    How to maintain the solar combiner box?

    Maintain Solar Combiner Box

    Source: Envato

    Solar combiner boxes are generally installed outdoors, and affected by ambient temperature, humidity, and natural disasters, they will definitely cause damage to the solar PV combiner box. In order for the components in the solar combiner box to continue to work normally, it is necessary to maintain the solar PV combiner box.

    Note: For the sake of your own safety, you must pay attention to disconnect the solar combiner box from the power supply before maintenance, and perform maintenance work seriously and responsibly.

    Clean the inside of the combiner box

    It is important to keep the inside of the combiner box clean. Cleaning can be done with soap and a soft damp towel, but please keep the combiner box dry with a dry towel after cleaning.

    Check internal wiring connections

    Please double-check whether the combiner box has stopped working. Wear insulating gloves and check the connected wires for looseness and oxidative deterioration in exposed areas. The replacement of materials must be done by people with professional electrical knowledge.

    Replace a blown fuse

    After the fuse is blown, it cannot be used again, it can only be replaced. Before replacing the fuse, be sure to pay attention to the circuit breaker, disconnect the circuit breaker, and check with a multimeter before replacing the fuse.

    Check the surge protector

    Check whether the window of the surge protector is green. If it is red, it means that it has failed and the module needs to be replaced.

    After maintenance, check again that all work has been done.

    Using solar power is sustainable, and a good quality solar combiner box can effectively protect the photovoltaic system, improve the efficiency of the solar system, and protect other equipment such as rear inverters from transient overvoltage.

    If you have any other questions, please contact Tongou. Tongou will answer your doubts and provide corresponding complete sets of equipment according to your actual situation.

    Hope this article is helpful to you.

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