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Extra Batteries and Inverters

Supercharged111
Explorer
Explorer
I saw this article and thought it was pretty neat. Since I want to add aux tanks in front of the rear fenders, I like the lift off wooden box that sits on top of the fender the best.

https://www.truckcampermagazine.com/camper-mods/projects/5-extra-battery-storage-areas-for-truck-campers/

Looks easy enough to build and wire. I wonder if anyone else has gotten more creative than what's in the article? The point of this and the inverter would be quieter boondocking, I hate to have to fire the generator to make a pot of coffee or run the microwave.

https://www.truckcampermagazine.com/camper-mods/projects/5-extra-battery-storage-areas-for-truck-campers/


I'm also curious about wiring an inverter. Wiring doesn't scare me one bit, I've done a few motor swaps in my day and am no stranger to a soldering gun. The camper/house wiring in comparison seems even simpler. I'm wondering if there's a junction box somewhere that I'm supposed to get into to tie the inverter in? Do you use a contactor of some sort to switch from shore power to the inverter?

Yes, I need to up my solar game as well, but don't plan to get into that in this thread. I had my questions answered there in a thread I posted previously.
2007 Lance 1131
1997 GMC K3500 crew cab supercharged dually
29 REPLIES 29

zb39
Explorer
Explorer
I put 6 6V batts and am AIM 4k pure sine wave inv in my Host. The inverter had an auto transfer switch and a 3 stage smart charger built in. I ordered the TC without a gen set. AC came in and went directly to the inverter and then out to the TC. I actually removed my converter and surprisingly Host had installed a transfer switch also, so I removed it.
This allowed me to run all circuits off the inverter, including AC and the fireplace and the fridge.
Normally if we were parked on a main street of a small town I could run the AC for 30 minutes easily.
I also carried a Honda 2K gen set. If I was plugged in to the grid in a campground or plugged into the Honda the AC was passed thru the inverter and into the TC. Also the battery were charged at the same time.
I normally kept my fridge on forced propane use with the controls on the fridge. If you wanted you could run your fridge on AC thru the inverter going down the road. I had dual 440 amp alternators on the truck.
I usually just ran propane 24/7. This set up worked very well for me. I always had all the power I needed.
The 12 volt stuff ran as normal.
2017 Host mammoth, sold
49 states, 41 National Parks, 7 Provinces
2019 2 door Rubicon 6 spd.
2019 Berkshire XLT 45B
2022 Host Cascade
2021 Ram 5500 Air ride

StirCrazy
Navigator
Navigator
Freep wrote:
A good inverter will have a transfer switch built in.



I have never seen an inverter with a transfer switch built it. I have a real good one and I also have a separate 50 amp transfer switch.

why would anyone want to have to replace the while thing if a couple hundred buck transfer switch fails?

Steve
2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100

Supercharged111
Explorer
Explorer
I've always just run the fridge off propane when I'm driving, never had it blow out.
2007 Lance 1131
1997 GMC K3500 crew cab supercharged dually

Freep
Explorer
Explorer
Kayteg1 wrote:

-those who really want to run camper on 12V, put big wires and designated HD plug for transfering 12V from truck to camper. That is pretty big task.


It's not that big of a task. Replacing the TV antenna on my TC ended up being more of a PITA than replacing the umbilical and truck wiring.
2014 Lance 992
2014 Ram 3500 DRW Turbo diesel

Kayteg1
Explorer II
Explorer II
It is a maze there, so it takes some studying to make the best choice (not saying poorer choices will not work). So some pointers I experienced
- inverters don't have transfer switches. Inverter-chargers do, but for lot of $$$
-not all chargers are equal. Some of them are design just for charging, when in RV you need a maintainer who will supply constant voltage
-factory RV converters of latest generation are design to work parallel with batteries, meaning they supposed to keep maintaining voltage of about 13.5V. But for the big money they cost, the 13.5v is not always true, so monitor it.
Lance made bigger charging cord for running refrigerator on 12V, but that require redoing truck wiring, fuse and relay. That means lot of work on your truck for still unreliable power supply. Most of owners run fridge on propane and cut the Lance plug off, replacing with standart you can put directly into your truck adapter.
-those who really want to run camper on 12V, put big wires and designated HD plug for transfering 12V from truck to camper. That is pretty big task.

Freep
Explorer
Explorer
Supercharged111 wrote:
No upgrade from truck to camper plug. In fact, it's a downgrade as it's a regular 7 pin and not Lance's proprietary plug. Camper presently has 2 group 27 deep cycles.


You might want to check this topic out.
2014 Lance 992
2014 Ram 3500 DRW Turbo diesel

Supercharged111
Explorer
Explorer
No upgrade from truck to camper plug. In fact, it's a downgrade as it's a regular 7 pin and not Lance's proprietary plug. Camper presently has 2 group 27 deep cycles.
2007 Lance 1131
1997 GMC K3500 crew cab supercharged dually

Freep
Explorer
Explorer
A good inverter will have a transfer switch built in.

Did you upgrade the wiring from the alternator of your truck to the electrical port for the camper?

What kind of batteries do you have now?
2014 Lance 992
2014 Ram 3500 DRW Turbo diesel

deltabravo
Nomad
Nomad
Supercharged111 wrote:
That's a pretty slick idea too. To be clear, with the inverter on, all it does is drain the batteries trying to charge them, correct?


Correct.

Here what I did to bypass the converter when using Inverter. Follow the link below.

Converter re-wire
I turn off the breaker and leave it off since my inverter has an internal charger
2009 Silverado 3500HD Dually, D/A, CCLB 4x4 (bought new 8/30/09)
2018 Arctic Fox 992 with an Onan 2500i "quiet" model generator

deltabravo
Nomad
Nomad
Supercharged111 wrote:
I'm wondering if there's a junction box somewhere that I'm supposed to get into to tie the inverter in? Do you use a contactor of some sort to switch from shore power to the inverter?


Get the right inverter/charger, and it has a transfer switch built in.

ALso, If you camper wasn't pre-wired for a generator, then there's no transfer switch in the camper.

I have my inverter wired between the shower power cord and the AC panel. ALL power goes through my inverter transfer switch. ALL circuits in my AC panel are live on inverter power. That's the easiest way to wire in an inverter.

Here's a few videos on my setup:

Video 1

Video 2

Video 3

How to disable your microwave on inverter temporarily for power conservation

Truck to camper wiring upgrade

My Solar
2009 Silverado 3500HD Dually, D/A, CCLB 4x4 (bought new 8/30/09)
2018 Arctic Fox 992 with an Onan 2500i "quiet" model generator

Kayteg1
Explorer II
Explorer II
I had such manual transfer switch on older motorhome. You should turn all appliances off when using it.
Wasn't too excited about it. Than other motorhome from 1980's had an adapter at generator and when you run generator - you plug shore cable into generator adapter.
Maybe not the most convenient, but extremely reliable and foolproof.
On other hand, the automatic transfer switch I had in Lance made quite a big box.
I open it and there is not that much inside, so for unit where each inch is at premium, that might be consider overbuild.
With all those automated gadgets we want in our TC, the April fool joke about need for tag axle might become very realistic.

Virgil_Diesel
Explorer
Explorer
With the Inverter On and the Cam Switch is on “Inverter” the line to Converter is Off
2006 Chevy Silverado HD2500/DA/CC/SB/Pullrite Superglide 16k
2009 Jayco Superlite 31.5FBHS
2006 Lance Lite 845
2005 Jeep Wrangler Unlimited Sahara Rubicon 0337/1000
2013 18' Carson Flat bed 10k gvw trailer 16" 8 lug wheels

Supercharged111
Explorer
Explorer
Virgil_Diesel wrote:
Here what Idid to bypass the converter when using Inverter. Follow the link below.
Cam Switch


That's a pretty slick idea too. To be clear, with the inverter on, all it does is drain the batteries trying to charge them, correct?
2007 Lance 1131
1997 GMC K3500 crew cab supercharged dually

Supercharged111
Explorer
Explorer
Kayteg1 wrote:
Supercharged111 wrote:

Duh! I forgot that Torklift makes mounts like this. I could easily make my own and hang it off the frame in front of the rear wheels. Out of the way and I could have a relay in the mix to divorce it from the truck too. Would plug into the camper the same as something that lived in the back of the truck.


I just went via torklift site and the only thing they do is hanging bracket with standard battery box.
So you need 1 for each battery.
At $140 a pop, that can get pricey and I can't imagine this thing lasting.



Yeah I have no intention of overpaying for that, but it reminded me of the idea to hang them off the frame in front of the tire. Excellent place for the weight.
2007 Lance 1131
1997 GMC K3500 crew cab supercharged dually