The method of determining how many inlets and how many exits of the combiner box

1. Grid connection in the same direction
1.1 Manner
Co-grid connection means that the power output of the solar photovoltaic power generation system is in the same direction as the output of electricity from the public grid. When the string voltage is the same, the number of inlet and outlet terminals of the combiner box should be equal to the number of cells connected in parallel, and if the combiner box uses a lightning arrester, the number of inlet and outgoing units should be increased by one.
1.2 Examples
Take the string voltage of 360V, the string current of 10A, and the combiner box voltage of 720V as an example, the 10A/1000V combiner box is selected, and the number of incoming and outgoing paragraphs should be 20, and the number of incoming and outgoing paragraphs should be 21 if the arrester is used inside the combiner box.
2. Reverse grid connection
2.1 Manner
Reverse grid connection means that the electrical energy output of the solar photovoltaic power generation system is opposite to the output direction of the electricity output of the public grid. In the case of the same string voltage, the number of inlet and outlet terminals of the combiner box should be the number of parallel cells minus one, the current size depends on the rated current of the combiner box, and the number of inlet and outgoing models should be increased according to the number of arresters.
2.2 Examples
Taking the string voltage as 360V, the string current as 10A, and the combiner box voltage as 720V, if the number of cells is 10, the number of incoming and outgoing units of the combiner box is 9. If there is a lightning arrester inside the combiner box, the number of incoming and outgoing items should be increased by 1, that is, 10.
3. Traditional independent power generation system
For the traditional independent power generation system, the number of incoming and outgoing sections of the combiner box should be equal to the number of panels connected in series minus one, and when installing a lightning arrester for the combiner box, the number of incoming and outgoing sections should be increased by one.