I hope you don't take this as a criticism - because that is not how it is meant - just wanting to add something for completeness.
Xantrex makes the Freedom type inverters in both 12 volt and 24 volt versions, with identical charging "amps" capability.
Using the version designed for 50 amps output, if a system is built using a 24 volt battery bank instead of 12 volts, then the charge rate (in watts) doubles. So using exactly the same components, wiring, bus bars, etc, the system could charge at ~ 2 kW instead of ~ 1 kW. Charge time would drop from ~ 3 hrs to 1.5 hrs.
You know how it is - I can't write a post without trying to get people to use 24 volt systems.
Sort of like Graphite Dave and his inverter - charger concept.
Harry