Auxiliary Battery: To Use or Not to Use

[Hamandcamo]

So I have a basic sport, and am looking to run some power to my truck bed myself. I have acquired the following cig. outlet for the bed.
https://www.amazon.com/gp/product/B09JCNJGZ3/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1

I have the auxiliary switch setup, and am currently using one 40 amp switch, and one 15 amp switch. I plan on eventually cannibalize a rubicon/eaton locker, so I would like to keep the the 40 amp aux. switch free if possible. I plan on running a fridge, and a few small devices, with the potential for rgb lighting for my soft topper. This puts me fairly close to the 15 amp limit from what I've read on datasheets.

With that being said, I was wondering if I could use the auxiliary battery to route power to my bed, but can't find too much information on it. I always disable ess, and that's really the only use I have read for it. Has anyone done this? And does anyone have information on this auxiliary battery/experience with going this route?

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[Mr._Bill]

There are other threads on this. The ESS battery is not large enough to be useful for running accessories. Its primary purpose is to keep the computers stable during ESS events. The ESS system is always on and cannot be disabled. The button on the dash is just a temporary means to keep it from activating. The Genesis Dual Battery Kit is a good option to provide a battery to run accessories.

 

[Dougstdig]

If your running wires anyway, why wouldn’t you just run the power to the fuse box under the hood? I say fuse box instead of directly to the battery so you can still have switched (accessory) power.

 

[Hamandcamo]

I'd have to take a look at a circuit diagram, as I'm not 100% sure if there is a way to route from the box to keep it waterproof, or if/where there is 12vdc to tap into. @Dougstdig

@Mr._Bill
Thanks, I'll have to check it out. Would a tazr disable it?

 

[Mr._Bill]

I'd have to take a look at a circuit diagram, as I'm not 100% sure if there is a way to route from the box to keep it waterproof, or if/where there is 12vdc to tap into. @Dougstdig

@Mr._Bill
Thanks, I'll have to check it out. Would a tazr disable it?

The Tazer will tell the computer that the button on the dash is always in the off position so that the ESS does not activate. The ESS system cannot be disabled or removed, it is always on.

 

[chorky]

Like already stated the ESS battery is not sufficient for a fridge and a few devices. You really need something much more. Even the group 25 batteries supported by the Genesis dual battery kit wouldn't suffice for running a fridge very long without destroying the battery.

Depending on how long you plan to be stopped, you could need a 100ah battery or more. 100ah is sorta the 'standard' it seems for most weekend camping situations. Look into amp-hour ratings, how to calculate them, and then apply that to your own situation to determine what size battery you need, and go from there. You would also need to look into a DC/DC charger, and probably a lithium battery specific to your fridge and other bed items.

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