I currently have two Victron MultiPlus 24/5000/120 inverter/chargers (one has a SN of hq25229xmr9 and the other I can provide in required) along with a Victron battery bank, the full Lynx distribution chain, and a Cerbo GX. My goal is to install this system in my RV so it can power both DC and AC loads onboard, while also serving as a home backup in case of a grid outage. For home backup, I intend to provide a 240V split-phase (180°) output through a plug that connects directly to my generator input on my home.
My RV shore power connection is 120V, 30A solely. Using the MK3 USB dongle, I programmed the two inverters to operate in split-phase mode, and the system successfully produces a 240V 180° output when configured this way. The issue arises when I connect 120V single-phase shore power: the two inverters do not recognize this as a valid full grid input, so they will not switch to charging.It seems that adding a Victron Autotransformer 100A 120/240V could resolve this by taking the single-phase shore input and creating the proper split-phase signal for the inverter AC inputs, allowing the chargers to engage. My question is whether there’s a way to configure the system so that only one inverter accepts the single-phase input and charges the battery bank, without requiring a second leg of the 120V input. At present, the only workaround I see is to run the VE.Bus in “combined” mode for shore charging, and then reprogram the units into split-phase mode whenever I need 240V backup for my home. Is there a more elegant solution that avoids constant reprogramming?