Hey T4R,

I've been planning and buying parts for a dual battery setup for a while and I am finalizing the plan before I buy the cables.

I am trying to make a beefy setup because I would like to use my winch with the batteries in parallel so I can share the load between both batteries.

That's where my knowledge falls short and I am unsure of what size the cables and fuse should be to handle that much load. (For reference, my Warn Zeon 10-S platinum spec sheet is stating that at full 10,000 lbs pull, the load could be up to about 400 amps)

My plan is to use 2/0 AWG for both positives and negatives and using a 300a fuse. I am also planning to upgrade the OEM ground to 2/0 AWG.

Here's the schematic of my planned build:


A couple points:
-I would be considering upgrading the alternator in the future, but in the meantime, I will be using a battery tender once in a while.
-I have no plan to purchase a DC-DC charger for now, simply to not overcomplicate my build.
-I am using, and already installed, the shrockworks dual battery kit, their ACR and fuse mounting tray and their power distribution module.
-I realize that 2 AWG is probably overkill for my bussmann relay box.. but I already have the 100 amp circuit breaker in hand and it would be overkill for 4 AWG cables

I would greatly appreciate tips and comments before I commit to buy my cabling and install it all!
(Thanks to those that already helped me out in private message)

Here is a 70 page post over 6 years with lots of good information.
https://www.expeditionportal.com/for...-for-50.77503/

I've got the exact same setup except for the winch. Ended up running 1/0 AWG with 200 AMP fuse to connect the batteries to the ACR and ground. I went a little bigger because it's kind of a long run around the back of the engine and I wanted as little resistance as possible to the power going back to the house battery since I'm trying to not upgrade my alternator.

I did run 4 AWG from house side of ACR to the 100 AMP fuse on the power distribution module.

Planned on using the Blue Sea Remote Battery Switch to bypass the fuse for a winch later but ended up putting something else behind the grill.

Good luck.