New post, since I have done this in an actual Alaskan now.
I deemed the 120vac "shore power" setup worthless for my application so I simply plugged a 3 prong pigtail that is connected to my house battery, through a fuse, into the outlet that was located above my fridge cabinet. Effectively back-feeding 12V into the existing upper camper wiring and fixtures.
The pigtail is connected to 12v DC from my house battery, and now all the existing plugs and light fixtures in the upper half of the camper are 12V as well. Breaker box was removed and its just a junction for the wiring in the wooden box on the ceiling now. I was also able to fish a wire from the ceiling box over to the roof vent space so I could install a 10 speed intake/exhaust fan. (After I replaced the rotten wood surrounding the OG vent)
Drawback is that you have to unplug the pig tail from the outlet it to lower the top half, so you wont have top half power in the lowered position. Also, the prongs of your pigtail are live, so cover them with something when you unplug, or you will short them out on the metal venting above the fridge (Learned this the hard way).
One other thing, I changed the outside plug to an outlet. This way, no one is going to try and plug 120VAC into the 12V system, and now I have a convenient spot to run 12V things on the outside of the camper as well.
House battery resides in the huge void behind the DC fridge, along with 1500W inverter for water heater, a DC-DC charge relay, and 2 AC battery chargers. Outside vent is plugged with foil backed foam insulation. New shore power plug is on the back of the camper and connects to battery chargers only.
Edited by Bos_Trok, 20 October 2023 - 05:56 PM.