The main information for the selection of photovoltaic junction boxes should be the current size of the components, one is the maximum working current, and the other is the short-circuit current. Of course, the short-circuit current is the maximum current that the component can output. According to the short-circuit current calculation, the rated current of the junction box should be The safety factor is relatively large. If the junction box is calculated according to the maximum working current, the safety factor is smaller.

The most scientific selection basis should be based on the change of the current and voltage of the cells that should be taken out with the light intensity. It is necessary to know which area the modules you produce are used in, and when the light is the strongest in this area, and then compare the battery. The change curve of the current of the chip with the light intensity, the possible maximum current is investigated, and then the rated current of the junction box should be selected, which should be more scientific.
1. According to the power of photovoltaic modules.
2. Other specifications of components
3. The parameters of the diode.
4. The most important point, what is the short-circuit current? For this test, the selection of the diode depends on the following quantities:
Current (big is good), maximum junction temperature (small is good), thermal resistance (small is good), voltage drop (small is good), reverse breakdown voltage (generally 40V is far enough)