This installation was completed in March of 2026.  The customer contacted me about an installation for his RV and we had several discussions about what would work best for his needs.  We finally settled on a single 3k Multiplus based system.  The customer had three factory installed GoPower 190 watt solar panels with a factory installed Victron 100/50 MPPT solar controller.  We decided to augment this equipment with four additional 200 watt NewPowa solar panels and a second 100/50 MPPT solar controller.  The customer also wanted a Cerbo GX with touchscreen and onboard generator integration.  The customer chose to power the system with two EPOCH 460 amp hour Essential Series batteries.  Once we had finalized the system design, the customer brought the RV to me for the installation.

The installation took three and a half days to complete.  I installed a Multiplus II 3kva 2×120 inverter charger to provide power to the RV.  It replaced an existing Kisae 200 watt inverter.  I was able to install all the victron equipment in the forward compartment under the 5th wheel overhang.  I repurposed the factory Kisae mounting plate for the Multiplus and other victron equipment.   This allowed me to mount all the equipment on the wall of the compartment.  The Customer had two 100 amp hour Battle Born batteries from the original system.  These were mounted in a separate battery compartment on the driver side of the RV.  I disconnected these batteries and installed the two new EPOCH batteries in the basement of the RV along the front wall.  This put them just on the other side of the wall from all the Victron Equipment.  The customer had a slide out storage tray installed in the basement compartment and the batteries fit perfectly alongside the tray, between it and the front wall of the compartment.  I built a battery box to cover the batteries and allow items to be stored on top of them without causing any interferance.  The customer lost a small amount of storage space in the basement area, but was still able to lay items on top of the battery box, which minimized this loss.  The customer did gain storage space in the old factory battery compartment that easily made up for the small loss of space in the basement.  No storage space was lost in the front compartment because all items were mounted on the wall of the compartment away from any storage areas.

Because the RV had an onboard Onan 5500 watt LPG generator, I added an Atkinson Electronics GSCM-mini to allow the Cerbo to automatically start/stop the generator.  As part of this installation, I combined the generator L1 and L2 outputs by adding a 6 AWG jumper wire between them to allow its full power to pass through on either leg.  This is a specific issue to the Multiplus II 2×120.  When it senses the incoming power on L1 and L2 are the same phase, it ignores the L2 input and only passes through the L1 input.  The Onan 5500 generator has an L1 and L2 output, but they are in the same phase.  Thus only the L1 output will pass through the Multiplus without this modification.  By adding a jumper wire between the generator’s L1 and L2 outputs, the full generator output power can pass over either leg.  This allows the MP to pass all of the generator’s potential power through on L1 and then distribute it out to L1 and L2 on the output side.   I used the Cerbo’s Relay 2 output as a switch to allow the GSCM-mini to be power cycled remotely through the Cerbo if it ever needs to be reset.  I also installed Mopeka tank sensors on the onboard propane tanks and integrated them with the Cerbo and finally installed three Ruuvi Bluetooth temperature sensors and integrated them with the Cerbo.

Once I was done with the installation, the owners returned to pick up their rig.  I spent some time with them going over all the equipment and the Victron Connect App to interact with the equipment.  I also went over the VRM portal and how that monitored and controlled the system.  I had sent them an invitation to join the VRM portal for their system before they arrived.  We also set up a VRM widget on the owner’s phone to monitor the system