I have a 12V and a 48V inverter both 120V quattro 5000W on completely separate CerboGX's and everything. My RV is setup for 50amp split phase shore but I only have 120V devices. I currently have the 48V inverter feeding into the 12V inverter and then only using 1 leg of 50amp shore/80amp genny (20kw 240v).
It makes more sense for me to wire in the split phase so I have the 48V connected to black and the 12V connected to red, then a shared neutral. This would make half the power running on the 12V inverter and the other half on the 48V. Would this work? The circuit panels are wired 4gauge (100amp) to the inverters and Quattro's handle 100amps.
Problem I see is I'm risking overloading the neutral if I'm running 50amp shore and if i'm pulling 50amps on each leg and they're not split phase it could overload? BUT if the inverters are pulling the load then there isn't an issue since the neutral only carries the unbalanced load, if its passing through then the output will still be split phase so still isn't an issue. The only issue is if its charging while passing through or assisting which i'm unsure of.
I was thinking about just swapping my entire 12V with another 48V and going traditional split phase, but running separate systems works better as I'll have full redundancy as if one system goes down only half the outlets die. My 48V has solar and my 12V has alternator so when driving i'm able to pull 3000w from the alternator which would be ideal as I can run the front AC and it still charge my 12V. Only 12V devices are lights, water pump and macerator toilet so not huge loads. Another benefit is I usually just plug my coach into 15amp shore when at home since I have solar and just need piece of mind. I plan on also running a 15amp plug to each inverter so I'm moochdocking at a friends house I could run 2 15amp extension cords into separate breakers and effectively get double the input power. Or I can just plug one or the other in to charge either system depending on needs. The Quattro5000 has a minimum input of like 13.2 amps which is another issue i'd be avoiding.
Another issue is i'm planning on setting up a buddy plug to use when friends are camping with me and also to power my house using my RV's genny since its 20kw. Friends aren't a big deal because 240V appliances in an RV is rare and I can just make sure they don't have it or make them use a 50 to 30 adapter to be sure. But my house needs 240V for HVAC and such. I plan on wiring the buddy plug to the output2 on the inverters as its not used. Is there a way for the inverters to just passthru the split phase from the genny or would I need a 2nd buddy plug connected directly to the genny? I need friends to use the inverters so we wouldn't need to run the genset and just run off battery/solar but if a power outage at home IDC if i'm running the genset the entire time.
I plan on wiring it up, setting the input limits on both inverters to 25amps and testing the system so no risk to anything. After all is good I can hookup a clamp meter to the neutral and see how the load is.