I have a north American home with a 200A split phase service.
My main service rated disconnect is in the garage where I want to install batteries and equipment.
The goal is to have a ESS backup system capable of supplying about half that entire service in a mains failure situation at peak. However I would like it capable of passing through the entire service. The batteries would be charged via 48VDC generator in a failure. I also like the idea of having a second AC source option for an AC generator hookup just in case the DC system failed. Was looking at the Quattro and Stacking two 120V units, and then possibly paralleling those to get the output I am looking for. OR would I be better of with parallel 240V unties and then using a transformer? I would like the system as flexible as possible for future projects like on peak load shedding but not a requirement. Just looking for a little guidance on bets practice for major component selection.
The main guiding issue is the fact I would prefer to take the “whole service” into the system and then output the “Whole service” via the existing wiring to the other side of the house where the main panel is.
All of the multiplus and Quatro units do handle a lot more through current than the inverter is rated for, so handling the whole load on pass-through should be OK. The transfer rating of the units is specified in the data sheet. For really large systems, then an external transfer relay can also be used.
For system topology, this depends on the desired load capability, for US/120-0-120 systems, then look at 2 (or 4) inverters configured in split phase for a static installation. Additional inverters can usually be paralleled later.