This installation was completed in April of 2025.  The customer purchased this Momentum Toy Hauler and contacted me regarding upgrading the batteries and inverter.  The RV came with 660 watts of solar and a 2000 watt inverter from the factory.  The inverter was set up to only power three circuits in a sub panel, however.  The customer wanted lithium batteries and an inverter capable of powering anything in the RV.  The customer was also working within a budget.  We had several discussions about possibilities.  I put together an estimate with a system schematic and the customer agreed to move forward.  The customer then brought the rig to me for the installation.

The installation took three days to complete.  Normally, I like to try to hide the new equipment in dead spaces in the RV, but this particular floor plan did not lend itself to doing this.  I ended up having to install all the equipment in the front storage compartment where the original batteries and inverter were.  All of the equipment fit nicely in this space and I was able to add a shelf on top of the new batteries to give additional storage space that did not exist with the factory installation.  I did not add any additional solar, but I did rewire the factory solar panels from parallel to series to better utilize the new Victron MPPT solar controller.  This was my first experience dealing with the new NPS 6000 watt inverter style onboard generator.  I have done numerous installations with Onan onboard generators previously.  The Multiplus II 2×120 has a quirk that makes utilizing an onboard generator a little unique.  When the Multiplus II senses two legs of incoming power with the same phase (like most Onan and apparently the new NPS inverter style generators supply), the Multiplus ignores the power coming in on Line 2 and only passes through the power coming in on Line 1.  This effectively halves the power output of the generator.  With Onan generators of 6000 watts or less, this can be overcome by placing a jumper wire between the Line 1 and Line 2 outputs to allow the full generator power to flow to either line.  This works because the generator power is manually split from the same output terminal to flow through two separate breakers and provide two legs for easy hook up to a 50 amp RV.  Because the power comes from the same output, there is no problem combining it again later.  I was unsure if the NPS generator would behave the same because it was an inverter style generator.  I contacted NPS and was able to speak with their head electrical engineer.  He confirmed I could do the same with an NPS generator to allow all of its power to flow over a single leg.  This was good news for the installation.

The only hiccup in the installation was that the customer was told when he purchased the RV that Grand Design installed Easy Starts on at least two of the three air conditioners at the factory.  This meant I was only going to have to add one Easy Start during the installation.  I was a bit skeptical of this information because I had never seen a factory installed Easy Start from Grand Design previously.  As I suspected, when I checked the air conditioners there were no Easy Starts installed.  It was easy enough for me to install three Easy Starts for the customer though.  Once the installation was complete, the customer came to pick up his rig.  I spent some time going over the installation with him and teaching him how to use the Victron Connect app to interact with his new devices.