No, just connecting to the grid. I figure the AC battery is a combo battery charger/inverter. But I don't really know as I have not looked up any specs on it.
Reading an schematic of an out of date grid and battery system, both are not connected at same time. In battery mode, the grid is locked out and the batteries are charged or supply power for the house. But there is no mention of an AC battery in the old drawings.
In my "combiner" box, there is provisions for two inverter strings and one "AC Battery" input. All are on the 220VAC side. Since I have three strings, I'm using the "AC Battery" input as my third string input.