Chaparral 371MBRB
System Schematic

Basic Parts List

Installation Notes

This installation was completed in November of 2023. 

The owner of this RV had been in contact with another installer to complete a full time off grid system installation, but that installer ended up having to back out of the installation.  The owner was then referred to me through an on line RV solar forum.  The owner contacted me and we discussed what he wanted to accomplish.  The owner had purchased a large battery pack built from 280 Amp Hour EVE lithium cells.  The battery pack consisted of five 24 volt modules, for a total of 1400 amp hours of capacity.  The owner also already had solar panels for his system (half of which he had installed himself).  The owner wanted someone to integrate his battery pack and existing solar (as well as plan for the  additional solar) into a Victron based system.  The owner intended to live in his RV with his son for the next two years full time and spend as much time as possible off grid.  The owner wanted to be able to run anything and everything in the RV like it was connected to shore power, whether or not shore power was available.  I put together a proposal and the owner agreed to move forward with the installation.  The owner traveled from Idaho to my location for the installation.

The installation involved adding dual Victron Multiplus 24/3000/70 inverter chargers in split phase configuration to provide the power from the battery bank.  The owner planned to mount his battery bank under the bed in the master bedroom and wanted the electronic equipment mounted in the front compartment of the 5th wheel, directly under the master bedroom.  The space for the installation was wide open and made the installation fairly easy and straight forward.  I added some additional mounting structure to the wall of the compartment to mount all the equipment.  The equipment was easily accessible for mounting and wiring in the large front compartment.  The installation took three days to complete.  I installed the battery pack in the bedroom and connected it to the equipment installed in the front compartment.  The owner had four existing solar panels already mounted to the roof of the RV and four additional identical panels he planned to add at a later time.  I wired in dual MPPT solar controllers.  One for the existing four panels and one for the future addition of the remaining panels.  Dual solar controllers were not needed for the amount of solar the owner had, but after discussions with me we decided having the redundancy of dual controllers was a good idea for his overall installation and future plans.

Because the system was based around a custom (and very large capacity) 24 volt battery bank, we needed a way to power the OEM 12 volt equipment.  I installed an Orion 24/12 70 amp DC-DC converter to handle this.  The converter provided plenty of power to handle all the existing 12 volt loads, including jacks and slides in this particular RV.

All of the Victron equipment was connected to to a Cerbo-S GX.  I added a GX Touch 70 display for the Cerbo-S in the hall of the RV above the existing control panel.  The display was easily accessible in that location with the RV slides in or out.  I also added Mopeka Pro Check LPG tank sensors to both on board propane tanks and three Ruuvi Bluetooth temperature sensors (one in the refrigerator, one in the front compartment and one for outdoor temperature monitoring) to the system.  All of these sensors were integrated into the Cerbo-S for easy monitoring locally or through the VRM portal.

Once the installation was completed, I spent time teaching the owner how to use all the associated apps and portals for interacting with his new equipment, including setting up a VRM widget on his smart phone.  The owner was very happy with the system and was looking forward to putting it to good use.

Chaparral 371MBRB