The “best” would be some kind of DC to DC converter
No sense in going dc->ac->dc if it can be helped.
Most laptop chargers can actually run on DC, and with as little as 48 volts. Here is a german guy demonstrating it. So if your battery bank runs on 48 volts, I think you might be able to just connect it directly to the input of a laptop charger and it will work.
Most laptop chargers can actually run on DC, and with as little as 48 volts. Here is a german guy demonstrating it. So if your battery bank runs on 48 volts, I think you might be able to just connect it directly to the input of a laptop charger and it will work.