Dual Battery Installation For Fridge And Auxiliary Power

This site may earn a commission from merchant affiliate
links, including eBay, Amazon, Skimlinks, and others.

Joined
Jun 7, 2019
Threads
32
Messages
943
Location
Odessa (Tampa), FL
I've been working on this project for a few months, and would have completed it sooner but a back injury side-lined me for a while. My goal was to power accessories (lighting, USB charging, SnoMaster EX75 fridge) with an independent battery, and to charge that battery via the alternator and solar. The fridge will reside in the LC full time.

For charging, I went with a Redarc BCDC1240 due to it's high current capacity and ability to charge LiFePo4 batteries. I use their brake controller and it has performed perfectly, so I decided to stick with a known brand. For accessory control, I decided on the sPod Bantam with touch screen, again, based on prior experience with the brand. For the auxiliary battery, I purchased a Lion Energy Safari UT1300. I was initially looking at Battleborn, but Costco was running a special on the Lion @ $699.

The BCDC is mounted in the engine bay on top of the fusebox. I originally planned to mount it on the rear panel of my ARB drawers, but couldn't get all the required cabling to fit in the door sills. The Bantam is right behind the fusebox, on a modified Power Trays bracket. The battery is mounted on the side wing of my drawers, just behind the rear seat. It's held in place with Velcro strips on the bottom, which stick very aggressively to the ARB carpeting. There's also a Velcro strip on the side of the battery securing it to the interior side panel. I installed a 12V power outlet and a dual USB port with voltage display on the rear face of my ARB side kit, each on it's own sPod switch.

SInce the fridge is dual voltage, it automatically switches to 12V when 120V is not available. While driving, it's plugged in to the OEM inverter (I ran a short extension cord from the rear receptacle so I had access with the ARB side kit in place) and when parked away from home, it switches over to 12V. Once I install a solar panel, my reliance on shore power for the fridge will be minimal (I will plug in at home since my LC is garaged).

Here are some pics. . .if you have any questions feel free to ask. Overall this was a fairly easy installation. The most difficult part was getting my cables (1-#6, 3-#10, Ethernet) through the firewall grommet. That as a PITA.


IMG_0352.webp
IMG_0354.webp
IMG_0353.webp
IMG_0368.webp
 
Nice work!! That Lion battery is pretty sweet, and good price! I think this is the way most house battery setups will go. Operating temp of the Lion makes it such that you should only mount it in the vehicle vs under hood which could be a downside for some, but man at 23lbs, 80 - 100aH of usable energy, and 3,500 cycles!!!
 
Last edited:
It's good to see lithium batteries being used in these applications, the energy density is impressive. Just need the price to come down a bit..

Couple of questions/concerns:

I would recommend a proper battery carrier, velcro may be fine under normal conditions, but in the event of an accident it could let go. I wouldn't trust it.

Are you protecting the terminals from accidental contact at all? What about fusing?
 
It's good to see lithium batteries being used in these applications, the energy density is impressive. Just need the price to come down a bit..

Couple of questions/concerns:

I would recommend a proper battery carrier, velcro may be fine under normal conditions, but in the event of an accident it could let go. I wouldn't trust it.

Are you protecting the terminals from accidental contact at all? What about fusing?

Redarc recommends fusing the connections to both the starting and the auxiliary batteries, and they sell a 60A kit for that purpose. I installed the kit (2 independent fuse holders). One is under the ARB side wing (under the Lion battery) and the other is mounted on the Power Tray near the Redarc unit (you can't see it in the photo).

As for a battery carrier, trust me, this battery isn't going anywhere. I'm a pretty strong guy, and I cannot budge the Lion from its spot. I wanted to move it slightly rearward and it took me 10 minutes to pry the Velcro from the ARB carpet.

I will eventually protect the terminals on the Lion, but nothing get's place back there so it's not a high priority.
 
I'm looking at a solution as well. Good to see what you put together.
 
I would recommend a proper battery carrier, velcro may be fine under normal conditions, but in the event of an accident it could let go. I wouldn't trust it.

I agree, a hold down is essential. In an accident or offroad tip/rollover that battery is a heavy projectile.

I also agree with covering the battery terminals (and that post you have exposed in the engine bay). Drop a spanner on one of them sometime and you'll have a whole different appreciation for the need to cover them.
 
I agree, a hold down is essential. In an accident or offroad tip/rollover that battery is a heavy projectile.

I also agree with covering the battery terminals (and that post you have exposed in the engine bay). Drop a spanner on one of them sometime and you'll have a whole different appreciation for the need to cover them.

Good point on the engine bay terminal...forgot about that one.
 
Bumping a thread.... @catastrofe

Looking to do a similar setup and curious how this is holding up for you? Anything you would do different?

Thanks

B
 
Bumping a thread.... @catastrofe

Looking to do a similar setup and curious how this is holding up for you? Anything you would do different?

Thanks

B
Thanks for the bump. Everything is working as intended. I did move my sPod touchscreen from the a-pillar to the RAM tough track above my center display as it's more functional there. Otherwise, I wouldn't change a thing.

IMG_0730.webp
 
How is your charging having the BCDC in the engine bay and battery in back? I have "heard" it is better to have the BCDC closer to the battery, but seen most installs completed with them in the engine bay.

Thanks
 
How is your charging having the BCDC in the engine bay and battery in back? I have "heard" it is better to have the BCDC closer to the battery, but seen most installs completed with them in the engine bay.

Thanks

I haven’t noticed any issues but frankly, unless I was to actually measure output, I’d never know.

When I’m driving, the fridge runs off the rear AC receptacle and the auxiliary battery is charged via both the alternator and rooftop solar panel. Even with the aux battery well depleted, a couple of hours driving brings it to full charge.
 
The Large Lithium battery will fit inside the fit-kit on the driver side. It will not fit inside on the passenger side.

(My setup is very similar)
 
The Large Lithium battery will fit inside the fit-kit on the driver side. It will not fit inside on the passenger side.

(My setup is very similar)

Not in a setup with a roller floor and the side kit. Unfortunately, there are brackets that reduce the usable space.
 
Got it .. I didn't realize the RF had internal brackets, thought it just bolted up.

With a RFRD or RD there are no internal brackets and the lithium battery fits right in there.

battery-on-left.jpg
 
What gauge wires are you running from BCDC to battery? I'm compiling the parts and thinking 6 GA and running through firewall to back, but have also seen 2 GA and underneath.

Planning on Redarc 1240d connected to a BattleBorn 12v 100AH to run a fridge in the back compartment.
 
What gauge wires are you running from BCDC to battery? I'm compiling the parts and thinking 6 GA and running through firewall to back, but have also seen 2 GA and underneath.

Planning on Redarc 1240d connected to a BattleBorn 12v 100AH to run a fridge in the back compartment.
I ran 6 gauge.
 
What gauge wires are you running from BCDC to battery? I'm compiling the parts and thinking 6 GA and running through firewall to back, but have also seen 2 GA and underneath.

Planning on Redarc 1240d connected to a BattleBorn 12v 100AH to run a fridge in the back compartment.

Is the battery going in the back? If so I would put the Redarc there also to minimize voltage drop. Closer the better to the battery within reason.
 
Is the battery going in the back? If so I would put the Redarc there also to minimize voltage drop. Closer the better to the battery within reason.


battery in back. is there any issue with overheating the redarc or needing additional cooling if placed in the back? I "should" have space for it back there.
 
Air flow is always a concern with these. You would need to install in a ventilated space or ensure it receives adequate air flow.

The reason I say close to the battery is the charger needs to be able to accurately measure the battery voltage (and temperature but not as critical) to properly charge the battery. Best practice is to have the charger near the battery being charged. At least do some research and consider it.
 
Back
Top Bottom