solar photovoltaic 

As a connector for solar cell modules, the primary function of the photovoltaic (PV) junction box is to export the electrical energy generated by the solar cell module via cables

. Due to the special application scenarios and the high value of solar cells, the PV junction box must be specially designed to meet the usage requirements of solar cell components

. The PV junction box mainly has two functions: the basic function is to connect the PV module and the load, extracting the current generated by the module and producing power; the additional function is to protect the module's output wires and prevent the hot spot effect

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1.1 Connection

As a connector, the junction box serves as a bridge between the solar module and control devices such as inverters

. Inside the junction box, the current generated by the solar module is extracted and directed to the electrical equipment through terminals and connectors

. To minimize power loss caused by the junction box, the conductive materials used must have low resistance, and the contact resistance with the busbar output wires should be small

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1.2 Protection

The protective function of the junction box includes three aspects: first, preventing hot spot effects through bypass diodes to protect the battery cells and modules; second, achieving waterproof and fireproof properties through special sealing materials; third, reducing the operating temperature of the junction box through special heat dissipation design, which lowers the temperature of the bypass diodes and thereby reduces their leakage current, minimizing power loss to the module

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Product Characteristics:

1.

Low specific gravity, with the lowest density among engineering plastics.

2.

Good chemical corrosion resistance.

3.

Excellent high and low temperature resistance, coupled with superior mechanical properties.

4.

High flowability, excellent processing performance, and superior surface gloss.

5.

UL94 halogen-free flame retardant, free of bromine and antimony, compliant with EU halogen-free environmental requirements.

6.

Good dielectric resistance, suitable for electrical applications.

7.

Superior weather resistance, ensuring long-term performance stability even under harsh climatic conditions

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In recent years, the photovoltaic solar industry has gained worldwide attention as a green and clean energy source, with strong government support

. As a core component of solar power generation, the PV junction box plays a crucial role. Regarding material selection, it should be noted that the PPO (Polyphenylene Oxide) material used for PV junction boxes must possess properties such as UV resistance, aging resistance, high temperature resistance, corrosion resistance, and flame retardancy with a temperature range of -40°C to 130°C, halogen-free flame retardant V0, among others. This is because the connection materials in PV DC circuits are long-term exposed to extreme environments, needing to withstand UV radiation and extreme temperatures (both high heat and cold)

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