Split phase 120/240 hardware

Q&A and troubleshooting
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1

A Canadian here, seems like alot of the victron gear is aimed towards single phase stuff…

I use a multiplus ii 2x120v in my rv which works perfectly as the load center just splits the 120v into 2 banks with no true split phase 240v being used by anything

I have been looking at installing a system in my house (120/240v split phase) and the multiplus and Quattro 2x120v do not offer split phase 240v from the inverter, only pass-through split phase from grid/gen.

Am I missing something in the product lineup or Is my only option to use a pair of single phase inverters linked for split phase operation?

2

Yes, two multiplus or two quattros configured for split phase is how it is done.
There are Victron example schematics showing how to wire them (shared neutral).

A single multplus or quattro with an autotransformer is also possible.
I do not recommend this approach for a house, due to neutral current limitations.

3

Thanks, I figured thats the only way to do it with victron gear.

A side question (sorry just thought of it, and can’t recall seeing anything in my travels). if I go with multiple inverters to do this, can they run on a common battery bank or do they require separate banks? The drawings I have come across haven’t shown them as a “common” bank

4

Most definitely, they run on one battery bank.
Two would actually be hard to manage with a Victron system.

In my setup, the battery stack feeds a + DC busbar, with MEGA fuses for all loads, including two Quattros for split phase.

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Dual Victron Quattro 48/5000/70-100/100 120V, 100A Autotransformer, Cerbo GX, Victron SmartSolar MPPT 250/100, Victron SmartSolar MPPT 250/70
Victron SmartShunt 500A, Carlo Gavazzi EM530 Grid Meters, EG4 Chargeverter with Victron SmartShunt as DC Meter, All gear installed in 19" in movable rack
12x QCells Q.PEAK DUO XL-G10.3 480W Bifacial, 4s2p + 4s, Langir Breakers/Disconnects, Custom Combiner Box
3 Custom Unistrut Ground Mounts, 220’ underground PVC conduit run to house, 44’ PV THHN/THWN2 in EMT conduit inside house
3x EG4-LL v1 with 125A Class T Fuses, 300A Class T Fuse in Battery Rack, 70V MEGA Fuses on modular Victron Busbar

1 Like
5

You can disregard the autotransformer in this schematic, it just balances the loads on the inverters and is optional.

6

Thanks, I’ve looked through those drawings. I was just hoping their was a better/more simple option that offers split phase inverter operation