If you wire anything
directly to a battery, be certain to use an appropriately sized fuse or over current device (sized for the wire
, NOT the device being powered) within 18 inches of the positive battery connection, per the NEC.
14 AWG needs a 15 amp fuse
12 AWG needs a 20 amp fuse
10 AWG needs a 30 amp fuse
8 AWG needs a 45 amp fuse
6 AWG needs a 60 amp fuse
Larger cable (2 AWG and up) used for inverter feeds need inverter-specific fusing.