Regarding battery charging - I installed a
100Ah battery in the tongue box, and I have 3 ways to charge - I installed a
Renogy 40 Amp DC-DC charger in the tongue box, and ran 6 gauge wire from the Jeep battery to back bumper, through an
Anderson connector to feed the charger (60 Amp breaker at the Jeep battery connection). I have a switch box for all my lights and used one of those for turning the charger on and off.
Regarding your question of running this through the 7 pin - those wires are fairly small size so I don't recommend doing that unless you are using a low current charger.
I monitor the battery with a
Victron Connect with Bluetooth so I can see state of charge, temperature, etc. from the cab while driving. The Renogy charger will charge the battery from ~50% to 100% while driving in about 90 minutes. The 40 Amp one is likely overkill for one battery - if I had to do over again I may have gotten the 20 Amp, but that fast recharging time is nice to have.
I also have a
220w portable solar system and mounted the solar charge controller inside the tongue box as well. This works better than I expected and can easily keep the battery topped off with about 6 hours of sunlight.
I also recently purchased a
NOCO shore power charger since I was in a campground with AC power for a few days. This works really well with my battery - I decided to not mount this in the tongue box so I could use it with other vehicles if needed.
My use for battery power is mainly my
Whynter refrigerator (I normally keep it in back of Jeep but did run wiring inside the trailer if I decide to put it in there), lights, and a heated blanket for colder temps in the RTT. I also installed a USB charging hub that I use to charge phones and other USB devices. I've got a small DC inverter for charging laptops. I installed boat LED lights on each side of the trailer (3 each side) and can control each side with a rocker switch. I also installed a spot light on the rear and another rocker switch can turn that on and off.
I attached my wiring diagram and a couple of pictures of the install (before I cleaned it up).
[Disclaimer - I take no responsibility for the safety of any wiring that anyone does on their trailer or vehicle. Be sure to have your work checked by a vehicle electrical specialist.
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