The photovoltaic junction box is a connector between the solar panel (module array) and the solar charging control device. The main function is to connect the power generated by the solar cell with the external line, which is divided into crystal silicon junction box, amorphous silicon junction box, curtain wall junction box, which is composed of three parts: box body, cable and connector.
Function of photovoltaic junction box
Photovoltaic module junction box is mainly composed of two parts of junction box and connector, the main function is to connect and protect the solar photovoltaic module, while conducting the current generated by the photovoltaic module for users to use. The junction box shall form an enclosed space with the wiring system, which provides protection against environmental effects for the wires and their connections, provides accessibility protection for live parts, and reduces tension for the wiring system connected to it. The additional function is to protect the component lead wire to prevent the heat spot effect.
Certification of photovoltaic junction boxes
In order to provide users with safe, fast and reliable connection solutions, products must pass TUV, IEC certification and national certification. At present, the assessment of the quality of photovoltaic junction box products comes from TUV, UL certification. Major junction box manufacturers in China are also committed to developing junction boxes that provide users with safer, faster and more reliable connection solutions, and are also working hard for their products to pass the certification of TUV, UL, etc.
Characteristics of photovoltaic junction box
1, the shell is made of imported advanced raw materials, with very high anti-aging, UV resistance;
2, suitable for the use of outdoor production time under harsh environmental conditions, the actual use of up to 30 years;
3, according to the needs of any built-in 2 ~ 6 terminal;
4. All connection modes are connected by quick-connect plug-in mode.
The role of photovoltaic junction box
The junction box is used to connect the battery array to the charge control device. Therefore, it is generally necessary to be exposed to the outdoors and to be affected by various environmental changes. In addition, the junction box’s own electronic components will generate heat, so the junction box inside and outside will produce a large pressure difference. The effects of weather can exacerbate changes in internal and external pressure differences. Therefore, it is necessary to communicate with the atmosphere to balance the internal and external pressure differences to prevent the performance of the internal electronic components and the sealing performance of the junction box from being affected. At the same time, it is necessary to block solid and liquid pollutants such as water and dust from the external environment.
1, enhance the safety performance of components
2, sealing assembly current output part (lead part)
3, make the component use more convenient and reliable
Photovoltaic junction box selection
The selection of photovoltaic junction box mainly depends on the size of the current of the component, one is the maximum current of the work, one is the short circuit current, of course, the maximum current that the component can output when the short circuit current, the rated current of the junction box should be calculated according to the short circuit current, the safety factor should be relatively large, and the junction box is a smaller safety factor according to the maximum working current.
Sum up
The junction box acts as a connector and acts as a bridge between the solar module and the control device such as the inverter. Inside the junction box, the current generated by the solar module is drawn out and imported into the electrical equipment through the wiring terminals and connectors. In order to minimize the power loss of the junction box to the component, the conductive material used in the junction box requires small resistance, and the contact resistance of the bus strip lead line is small.
Post time: Jun-09-2023