Rod,
I looked into these and other options last year when we bought our Triton. There wasn't enough room under the bonnet for a decent sized second battery so it had to go in the tub. We use it to run our Engel and for powering our caravan as well.
I decided against the ArkPak for a few reasons. The main reason was that it only has a very small 6amp charger in it so it takes a very long time to recharge the battery. The second reason was I was paying for features that really weren't of a lot of use for me. The inverter as an example, while they can be handy, they aren't real efficient (from my researching) as they use a lot of battery power. Thirdly the ArkPak (or any normal battery box) used up space in the back of the truck where it would be difficult to pack other gear on top.
In the end I built my own system and I am extremely happy with it. I used one of those Pelican cases around 700mm long. In this photo you can see I cut a hole in the front of it and placed a vent plate over it. I did the same at the back so the box was ventilated.
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As you can see one half of the box is used for my battery system and the other for storing what I normally carry in the truck - tyre repair kit, snatch strap, jumper leads, spare fuel filters etc.
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In the close up of the battery system you can see I used a 20 amp Ctek D250S Dual DC/DC Battery Charger. This charges the battery reasonably fast when on the road and allows solar panels to be attached directly to the charger. I used a 120ah AGM battery. I lined the floor and the back of the case with 19mm ply.
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For my power sockets I used a ready made Baintech Universal Panel. These are actually for external mounting in their own alloy casing but I didn’t want it sticking out from the side of the Pelican case so I pulled the front panel off, drilled some holes in it and after cutting the right size hole in the case, mounted it as in the photo below.
This panel has a switch (which I mounted inside the case) to turn the power to it on and off. It also has a great feature where it will cut the power to anything plugged into it if the battery voltage drops too low. There is an override switch for this though if you need to keep something running.
As you can see in the photo below this panel has a voltmeter, cig socket, Engel socket (where the lead is plugged in) and a twin USB socket.
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This last photo shows where two power leads enter the case just below the handle. Both are connected via 50amp Anderson Plugs. One lead is the power lead from the main battery under the bonnet and the other goes to the rear of the vehicle to power the caravan. By using these Anderson Plugs I can just unplug the leads and take the box out of the truck if I wish to.
You will also see two unused Anderson Plugs at the rear, one to attach a Solar Panel and the other for accessory power for a 12v compressor or similar.
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I have a second Pelican Case the same as this one. It is my camping box so it will sit on top and interlock to the lid of this one and in doing so utilize the available space in the back of the truck much better than if I had just used an ArkPak or normal battery box.
I have not used the ArkPak you are looking at Rod but like Woodie I have used the earlier blue version. I think either one would be good if you just go camping for a weekend and can then recharge the battery at home.
Whichever way you decide to go remember that while these boxes are portable you wouldn’t want to be carting them around a lot as, depending on the battery you use, they can weigh 40 - 45kgs. My 120ah AGM battery weighs just shy of 37kgs on its own.
I will add that I had never really done any Auto Electrical work (other than running wires for a UHF or similar) prior to this so it took me quite awhile to put my system together.
My system did cost more than an ArkPak but I ended up with an auxiliary battery system that suited my needs better.
Anyway that may give you some more to think about mate.
Jeff