Junction box is a tool used to protect and connect wires. It is usually made of PVC and tin boxes. Domestic junction boxes are mainly type 86. The junction box is one of the electrical accessories, because the wires used for decoration pass through the wire tubes, and the junction box is used as a transition at the joints of the wires (for example, the lines are relatively long, or the wire tubes need to be turned around), and the wire tubes and Junction box connection, the wires in the conduit are connected in the junction box, which plays the role of protecting the wires and connecting the wires. Do you know what the function of a junction box is? What is the general price of a junction box? The editor will introduce it to you below.

1. Price of junction box

PVC junction box, 86 series, electrician, 50 double tone, plastic concealed box, Hebei Huasheng 0.37≥200 pieces

86 type wall switch socket universal PVC surface mounted hidden box/bottom box/junction box 0.40 200~1999 pieces

Wall switch 86 concealed round tube junction box low price 0.88 10~199 pieces

65*95*55 plastic junction box terminal junction box street light junction box ABS waterproof junction box 20.00 1~9 only

fhg4 two-in and two-out fiber optic junction box, FHG4-2/2 mine optical cable wiring Box of 24 cores 260.00 1~9 pieces

Cast aluminum box 400*230*110 Cast aluminum junction box waterproof junction box metal junction box 450.00

Supply of die-cast aluminum cable waterproof box 250*185 *88 Outdoor junction box IP67 waterproof box cable junction box 175.00

2. Junction box composition

Generally, a junction box consists of a box cover, a box body, terminal blocks, diodes, connecting wires, and connections The device consists of several parts.

The shell must have strong anti-aging and ultraviolet resistance; it must meet the requirements for use in harsh outdoor environmental conditions;

The self-locking function makes the connection more convenient and firm;

It must have a waterproof sealing design, scientific insulation protection against electric shock, and better safety performance;

The terminal blocks must be installed firmly and have good weldability with the busbar.

The main function of a diode is one-way conduction.

Connectors and connecting wires: have good insulation properties, and the male and female plugs have a self-locking function, making the connection between solar panels and electrical connections more convenient and reliable.

3. The role of the junction box

The role of the junction box in solar cell modules can be summarized in two points: a) connection and transmission function, b) protection of the module ; It is a cross-disciplinary comprehensive design that combines electrical design, mechanical design and material science.

Solar cell components perform photoelectric conversion through solar cells, and the electricity emitted by a single component must be transmitted through the junction box if it is to be transmitted to the charging and control system; and the junction box is also the main component of the entire solar system. The "tie" of the array connects many components together to form a power generation whole, so the role of the junction box in solar energy applications cannot be ignored.

Another more important function of the junction box is to protect the components; when the components in the array are blocked by dark clouds, branches, bird droppings and other obstructions and cause hot spots, the diodes in the components will be bypassed. It uses its own unidirectional conductive performance to bypass problematic batteries and battery strings, protecting the entire component and even the entire array, ensuring that it can be maintained in the necessary working condition and reducing unnecessary losses.

The most ideal component should be that each battery should be bypassed by a diode, so as to ensure the absolute safety of the component. However, due to cost and process perspectives, so far everyone uses a string of battery slices to bypass A diode is a simple and effective way to do this.

4. Performance requirements and selection of junction boxes

Due to the importance of junction boxes for components, it is particularly important to choose a suitable junction box; for an excellent solar cell module The junction box must have the following performance requirements:

a) Meet the requirements for use in harsh outdoor environmental conditions;

b) The shell has strong anti-aging and UV resistance ;

c) Excellent heat dissipation mode and reasonable inner cavity volume to effectively reduce the internal temperature to meet electrical safety requirements;

d) Good waterproof and dustproof protection for users Provide a safe connection solution;

e) Lower body resistance to minimize the power loss caused by the junction box;

The above content is what the editor will introduce to you today After reading the price of the junction box and how to select the type, I believe you will have a better understanding of the characteristics of the junction box and purchase a suitable junction box. The above junction box price information comes from the Internet and is for reference only. If you want to know more related content, please continue to pay attention to this site!