A photovoltaic junction box is a connecting device between a solar cell array composed of solar cell modules and a solar charging control device. Its main function is to connect and protect the solar photovoltaic modules, connect the power generated by the solar cells to external lines, and conduct the current generated by the photovoltaic modules.
I. Classification of Photovoltaic Junction Boxes
Solar photovoltaic junction boxes are classified into crystalline silicon junction boxes, amorphous silicon junction boxes, and curtain wall junction boxes.
II. Composition of Photovoltaic Junction Box
A solar photovoltaic junction box consists of three parts: the box body, cables, and connectors.
Box body: includes box bottom (containing copper or plastic terminals), box cover, and diode;
Cables: Commonly used cables include 1.5mm², 2.5mm², 4mm², and 6mm².
Connectors: Available in two types, MC3 and MC4;
Diode models: 10A10, 10SQ050, 12SQ045, PV1545, PV1645, SR20200, etc.
There are two types of diode packages: R-6 SR 263;
As a complementary product to photovoltaic (PV) modules, the PV junction box accounts for less than one-tenth of the cost of the battery, but it is a crucial component that determines whether the PV module can function properly. Improperly selected junction boxes can cause the solar panels to burn out, thus affecting the performance of the entire PV system.
