For the protection of the entire photovoltaic array, the fuse should be installed at the connection position between the photovoltaic array wire and the application circuit wire, generally installed between the battery and the battery pack and the charge controller, and installed as close as possible to the battery, which is used to protect the system and Wires to prevent the inflow of fault currents in other places, such as photovoltaic arrays or other connected power sources, such as batteries or battery packs.
If the rated value of the fuse is selected close to the lower limit, it provides protection for both the photovoltaic array wires and the charge controller. At this time, the photovoltaic array wire between the photovoltaic array and the charging controller does not need to be protected. Similarly, the positive and negative poles must be installed.
The rated current of the fuse at this position should be within the range of 1.25-2.4ISCARRAY. ISCARRAY refers to the short-circuit current of the photovoltaic array under standard test conditions, which is equal to N times the short-circuit current ISC-MOD of the photovoltaic string. Total number of PV strings. For those with a large rated current, there may be no corresponding fuse specifications, and other overcurrent protection devices such as overcurrent protection relays are usually used.