Forum Discussion

Explorer

Jun 12, 2015

Fuse size question.

Having a time figuring out fuse size, so what size fuse do I need? What i'm doing is putting in a pos and neg bus bar to get rid of the mess of cables at the batteries so I was wanting to fuse the hot wire coming off the battery to the bus bar. I'm running 2 group 24 batteries right now and will eventually upgrade to group 27. Guess i don't know if I should fuse to amount of battery amp's or what?

13 Replies

time2roll
Nomad
Jun 12, 2015
Depends on the wire size. Each branch off the bus may also need a fuse.
KMLsquared
Explorer
Jun 12, 2015
The correct answer is it depends on wire size and or the component it's protecting.
Joe417
Explorer
Jun 12, 2015
The starter wires (2 AWG cable) for the generator run directly to the battery terminals. No circuit breaker.

There is a 40 amp auto resetting circuit breaker protecting the battery from all camper circuits just before the disconnect.
There is a 40 amp auto resetting breaker after the disconnect.
There is a 40 amp auto resetting breaker feeding the jacks.
There is a 30 amp auto resetting breaker feeding the slide motor.