How Many Grid 120V for a Parallel Set of MultiPlus-II's

I am working on ironing out my first design. I have a 840Ah battery bank used to supply two 5kW MultiPlus-II’s configured in parallel. The goal for now is to charge the batteries from the grid overnight.

My question is, with the inverters in parallel, do I need two separate 120V AC power sources (one for each inverter) to charge the batteries? I would like to use both inverters to charge the batteries faster. I am using SEPLOS LiFePO batteries.

The Parallel, split- and three-phase VE Bus System manual will be the place to start, following up with all the various documents and training presentations linked therein.

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