This installation was completed in October of 2024.  The owner of this motorhome was a friend of a previous customer of mine.  He contacted me because he wanted to upgrade the existing system in his motorhome.  We discussed several options and ultimately settled on a plan for the upgrade.  The owner decided to purchase and install his own lithium batteries.  He went with Watt Cycle Mini 12 volt lithium batteries because they fit the OEM battery trays.  He was able to fit 12 of these batteries (6 and 6) on the OEM slide out battery trays.  This greatly increased the battery capacity of the system.

The existing solar package consisted of one small solar panel connected to a 30 amp MPPT solar controller.  This solar was replaced with eight 200 watt Newpowa Pro solar panels in a 4S2P configuration.  The new panels were mated to a 150/100 MPPT smart solar controller.  The OEM Magnum inverter charger powered a sub panel in the rig.  The owner wanted this same set up for the new Victron system, so I replaced it with a Multiplus II 3KVA 2×120 inverter charger.  I added a VE Bus Smart Dongle to the Multiplus so the owner could control it via the Victron Connect App on his phone.  I replaced the Magnum BMK battery monitor with a Victron BMV 712.  I was originally going to use a smart shunt, but due to the location of the battery bank, I switch to a BMV.  This allowed me to bring the BMV display toward the front of the rig to shorten the VE Direct cable needed to connect it to the Cerbo.  Finally, I added a Cerbo-S GX with a seven inch touch panel to monitor and control all the components.  I was able to install the Cerbo in the dash of the motorhome and put the display in the control center cabinet above the entry door where the original Magnum display was located.  I did need to use an HDMI extension cable and a USB extension cable to get the display to connect to where the Cerbo was installed.

The installation went smoothly, with no major issues.  There was a two day delay during the installation because I accidentally ordered a Multiplus II 1×120 instead of a Multiplus 2×120.  The delay happened because my distributor was out of 2×120 units and I had to wait for his shipment of new units to arrive.  Additionally, like with most diesel pusher motorhomes, the wire runs were a bit difficult, but I was able to get everything in place with a bit of work.