Well here it is... I made the coffin box on the street side in front of the wheel well, 16" x 16" x 72". Those dimensions work great for storing batteries and an inverter. It also doubles as a full size bed. I will install another piece of ply on top of the cover with a piano hinge. When folded out, it will be the width of a full size bed. I made the box out of 1 5/8 metal studs and 1/2 plywood.
For the service, I went with 50 amp. I mounted the shore power twist-and-lock hookup in the back bumper and ran 6/3 romex to the box. I am using a Magnum inverter 2012 2000 watt pure sine wave, recommended by some great support (thanks Lew!). I understand now why he is so adamant about these systems. I will never install anything other than Magnum brand in my trailers. I also partnered it with a Magnum battery monitoring system, DC shunt, 300 amp fuse, and the control panel. I used the Blue Sea disconnect switch ,transfer switch, and DC fuse panel. The transfer switch is for when (if ever) you would like to only run off of the TV power and not the bank. It will switch between the bank and the TV power, they are never married due to different battery charging rates. For the batteries I went with six 6 volt 220 Amp Hour AGM Trojan batteries. They are ran in a parallel series to equal out to 12 volts @ 660 AH. The inverter has adequate spacing above it because I used lexan between the inverter and the mounted accessories, raised off of the inverter. I used 1/8" x 1" copper bar for the run between the batteries and the inverter all bent and shrink wrapped. I installed the AC breaker box and DC fuse box on the exterior of the box for easy access.
I hope you enjoyed following this build!
Custom restorations and renovations
Keeping the Art on the road, one project at a time