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The primary purpose for using a fuse is to protect exposed wiring from catching on fire in the event of an accident or accidental short-circuit condition of the wires.
There are various types of fuses with different "blow" characteristics, such as delayed or slow-blow, instant acting, inrush-withstanding, etc. which can be selected to provide the short protection but allow some overloading and not create nuisance fusing.
Also consider that HV DC fuses have different requirements and characteristics than for AC fuses. It's not a one-size-fits-all situation.
Draw up a schematic or sketch of your battery pack with lengths of exposed wiring, that will help you visualize what needs to be protected and where to locate fuses.
There are various types of fuses with different "blow" characteristics, such as delayed or slow-blow, instant acting, inrush-withstanding, etc. which can be selected to provide the short protection but allow some overloading and not create nuisance fusing.
Also consider that HV DC fuses have different requirements and characteristics than for AC fuses. It's not a one-size-fits-all situation.
Draw up a schematic or sketch of your battery pack with lengths of exposed wiring, that will help you visualize what needs to be protected and where to locate fuses.