400w Solar Install on a 2021 Casita Heritage Deluxe 17’

Victron BMV-712 battery monitor
Victron Orion Tr Smart 12|12|18A DC-DC charger
PD 4655L Wildkat AC-DC converter
2 x Battleborn 100Ah heated batteries
Victron SmartSolar 100/30 MPPT controller
4 x Renogy 100w compact panels

Because of the massive space under the bunks of our Heritage Deluxe, I was able to create some mounts for both batteries under the bunk beds.

I didn’t want to put any holes in the roof so I used VHB tape on the panel legs and went through the grey vent for the wire run. I added eternabond over the feet to give it a little more holding power and ensure the tape is protected from the elements. This should increase the tensile strength of the feet from 270 lbs of tensile strength to 336 lbs of tensile strength per foot. So my total tensile strength is over 1400 lbs per panel. With a weight of 14 lbs, that’s a 100x safety factor to handle any wind factors. From my research and calculations, 130 mph wind hitting the panel laterally would generate 275 lbs. That gives me a 5x safety factor for what i consider a worst case scenario.

I also added tethers using marine cord to my install so if any panels come off they should stay on the Casita. I included one around the a/c unit and others around the vent caps. And all of the panels are connected to one another with the idea that it’s doubtful that all 4 panels would come off at one time.

Wiring diagrams can be found here: https://1drv.ms/b/s!AkBQeJQSZIj0xr8CON941Sl0S-a1xg
First page is the wiring as found from the factory for the components that I touched. Second page is the final solution. I didn't include fuses and bus bars and such in the diagram, just the components and connections.

I did all the labor myself so the all in cost for us was around $4000 which includes the components but also the tools, wires and other items needed for installation. The breakdown was:

Battery monitor and wiring, etc. - $270
DC-DC charger and wiring, etc. - $420
AC-DC converter - $265
Batteries - $1930 themselves and $200 for wiring
Solar panels, controller, mounts, wiring, tape, etc. - $1000