The photovoltaic solar panel junction box is a connecting device between the solar cell array composed of solar cell modules and the solar charging control device. Its main role is to connect and protect the solar photovoltaic modules, connect the power generated by the solar cells with the external lines, and conduct the current generated by the photovoltaic modules. The junction box is bonded with the back plate of the component through silica gel, the outgoing lines in the component are connected together through the internal lines in the junction box, and the internal lines are connected with the external cables to make the component and the external cables conductive. It is a cross field comprehensive design integrating electrical design, mechanical design and material science.

The photovoltaic module junction box includes a box body, which is characterized in that: the box body is provided with a printed circuit board, on which N bus bar connection ends and two cable wire connection ends are printed, each bus bar connection end is connected with the solar cell group string through a bus bar, and each adjacent bus bar connection end is also connected with a diode; An electronic switch is arranged in series between the connecting end of the bus bar and the connecting end of the cable, and the electronic switch is controlled by the received control signal; The connection end of the Nth busbar is connected with the connection end of the second cable; The two cable connection ends are respectively connected with the outside through the cable; A bypass capacitor is also arranged between the connection ends of the two cables.

Composition of junction box

The junction box is composed of box body, cable and connector.

The box body includes: box bottom (including copper terminal or plastic terminal), box cover and diode;

Cables are divided into: 1.5MM2, 2.5MM2, 4MM2 and 6MM2;

Connectors are divided into two types: MC3 and MC4;

Diode model: 10A10, 10SQ050, 12SQ045, PV1545, PV1645, SR20200, etc

There are two kinds of diode packages: R-6 SR 263

Main technical specifications

The maximum working current is 16A, the maximum withstand voltage is 1000V, the operating temperature is - 40~90 ℃, the maximum working humidity is 5%~95% (non condensing), and the waterproof grade is IP65. The specification of the connecting wire is 4mm.

Functional features

The power of the photovoltaic junction box is tested under standard conditions: temperature 25 ℃, AM1.5, 1000W/M2. It is generally expressed in WP or W. The power tested under this standard is called the nominal power.

1. The shell is made of imported high-grade raw materials, with extremely high anti-aging and UV resistance;

2. It is suitable for use in harsh environmental conditions with long outdoor production time, and the service life is more than 25 years;

3. It has excellent heat dissipation mode and reasonable inner cavity volume to effectively reduce the internal temperature to meet the electrical safety requirements;

4. Good waterproof and dustproof functions;

5. 2~6 terminal blocks can be built in as required;

6. All connections shall be made in quick connect plug-in mode.