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The fuse or breaker is sized based on the wire size first. Mounted as close to the power source as possible.
8 gage 40 amp, 10 gage 30 amp, 12 gage 20 amp etc, you want the breaker/fuse to trip prior to heating up the wire melting the insulation.
The next concern is to protect the application, selecting a fuse size that can be smaller than the maximum wire size fuse. A simple soulution is the automotive blade fuse where you can buy the holder with short wire leads. Use that to connect to the battery at the battery. Fuses are available from 1 to 30 amps...
A battery cut off switch is also not that expensive, the smaller simple ones with a red removable key are about $10.
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Cal 9.2 #19 SilverSwan
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