question

You should check the docs but as far as I am aware, connecting two, 'identical', units to the same bus, VE.Bus will initially cause them to work as a parallel pare.

From there split phase is a configuration option THIS explains the concepts.

You absolutely can not install a second unit on L2 unless the units are aware of each other and working in sync. I expect you know that, but plenty of folk reading this will not, and worse, will not even appreciate why it it matters.

Yes I read what little bit of info was on the victron site regarding this, but what I found wasn’t very detailed at all to say the least lol

Being that this isn’t truly a split phase 120/240 setup on the distribution side I think complications are going to be minimal here.

Units would be connected on the ve.bus, when I was configuring the one I’ve got I never noticed any options there for multi-unit configuration but I’d have to assume that wouldn’t show up until another unit is detected in the system

I am in no way qualified to talk about multiple units... I have 2 MP's but 1 is a 48 the other a 24, the former feeding the latter from an AC perspective.

I did initially try connecting them to the same GX, AC in and out disconnected, just to see what would happen and the GX just assumed they were a parallel pare, which wouldn't have been pretty had they actually tried to do anything, they have been separate ever since, each with a GX.
Anyway that is how I know just connecting the VE.Bus kicks the whole multiple process off.
They can be stacked parallel and multi phase, you can even do both so split or 3 phase with multiple inverters on a given phase is possible, but I couldn't tell you how to set it up. I doubt its too complex though. However as will many things Victron, you can get this stuff wrong, and potentially do damage, with an incorrect setting so switch it on and see what happens isn't a good plan without some understanding first.

On the electrical side if your inverters are 120V and you don't need 240V I guess you could just wire them as two separate systems, on the AC side at least.

You would run into issues with charging and battery management though as there would be two competing chargers connected to the same pack.

If you don't need 240 why not just use a simple parallel pare and call everything L1, ok well L

What is the genset? If its a standard 12 wire machine it is probably in double delta with the neutral at the mid point, if you reconfigure to low delta you would get 120 single phase.

in the UK we are on 230 single phase so double delta with the neutral at one end. interestingly the AVR is typically on a 120V winding, even then. Have a look at some Stamford docs...

Here you go... Page 5

I build Hydro sites, small ones, so if it spins and make power I have probably messed with it at some point. We DOL 100kW motors, three phase, onto UK split phase, which is 460V single phase effectively at the motor, and balance the windings up with capacitor banks in a configuration called C2C. then we chuck a load more water at them and watch them generate...

You don't get much further from the box than that... :-)

Please keep the thread updated I am interested to see where you go with it.

Sorry been having grief with the captcha for some reason it just keeps spinning and spinning and nothing happens. Clear cache, try different browser, curse at it and eventually it works again!

Anyways, as for the suggestion of running everything off of the single leg… no, that poses the issues I mentioned in my first post. Although the Rv doesn’t utilize both legs for 240v appliances I still have to be backwards compatible with the split phase shore power and generator. Converting everything to single phase is not really feasible

I missed the link about the pro site on the literature about split phase/3ph, I’ll check that out tonight

The units I guess, while wired like a split phase configuration are really just acting like 2 separate units as they are just feeding individual busses in the distribution with 240 not even an option in the panel

I guess I was just more worried about making sure I didn’t do anything dumb and fry the inverters because I had an oversight on some silly little aspect of the install/config!

Well as luck would have it, I received the other multiplus yesterday. Low and behold when I opened the box they had now shipped me the 2x120v model this time! I just can’t win here LOL

Anyways, I think I’m going to go back to plan A and just utilize the 2x120 as i had originally intended and find another use for, or sell the single phase unit.