In the construction of solar junction box components, individual cells are connected in series, solar junction box which is called series connection to achieve higher system voltage. Once one of the battery slices is blocked (for example: tree branch or antenna, etc.), solar junction box the affected battery will no longer work as a power source, but will become an energy consumer. The other unblocked batteries will continue to pass current through them, causing high Energy loss, "hot spots" will appear, solar junction box or even battery damage.
To avoid this problem, solar junction box bypass diodes are connected in parallel to one or several batteries connected in series. The bypass current bypasses the shaded cell and passes through the diode. When the battery slice is working normally, solar junction box the bypass diode is reversely cut off and has no effect on the circuit;solar junction box if there is an abnormally working battery slice in the battery slice group connected in parallel with the bypass diode, solar junction box the entire circuit current will be determined by the minimum current battery slice , And the size of the current is determined by the area covered by the cell. If the reverse bias voltage is higher than the minimum voltage of the cell, the bypass diode is turned on. At this time, solar junction box the abnormal working cell is short-circuited.
It can be seen that hot spots are components heating or local heating, solar junction box the cells at the hot spots are damaged, reducing the power output of the components and even causing the components to be scrapped, solar junction box seriously reducing the service life of the components, solar junction box and causing hidden dangers to the power generation safety of the power station. Heat buildup causes defective or damaged components. The formation of hot spots in battery modules is mainly caused by external factors. The main components or partial components are blocked by obstructions. Common obstructions are: leaves, dust, clouds, animal and animal feces, snow, etc.solar junction box internal factors include the internal resistance of solar cells and the sun. The reverse current of the battery itself is related.