I think it's for two banks of batteries, but it's quite low power compared to the usual charging switchboard (unless those switches are bigger than they look).
It's the same function as the No.5 switchboard, and probably for the same reason: the equipment does not have any voltage control and would not enjoy being connected to a charging vehicle battery.
Battery banks connect behind the panel, generator and load to the terminals on the front. Top switch selects generator connection, Battery A, Off, Battery B, lower switch selects which battery is connected to the load. Check the switch details for the maximum current it can carry.
Chris.
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