The photovoltaic junction box is a connecting device between the solar cell array composed of solar cell components and the solar charging control device. Its main function is to connect and protect the solar photovoltaic modules, connect the power generated by the solar cells with the external lines, and conduct photovoltaic the current generated by the component.
1. Classification of photovoltaic junction boxes
Solar photovoltaic junction boxes are divided into crystalline silicon junction boxes, amorphous silicon junction boxes, and curtain wall junction boxes.
Second, the composition of photovoltaic junction box
The solar photovoltaic junction box is composed of three parts: box body, cable and connector.
Box body: including box bottom (including copper terminal or plastic terminal), box cover and diode;
Cable: divided into 1.5MM2, 2.5MM2, 4MM2 and 6MM2 and other commonly used cables;
Connector: divided into MC3 and MC4;
Diode model: 10A10, 10SQ050, 12SQ045, PV1545, PV1645, SR20200, etc.
There are two types of diode packages: R-6 SR 263;
As a supporting product of photovoltaic modules, the cost of photovoltaic junction boxes is less than one-tenth of the cost of batteries, but it is an important component that determines whether photovoltaic modules can work normally. If the junction box is not selected properly, it can cause the panel to burn and affect the performance of the entire photovoltaic system