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Upon further review it seems like it might just make sense to leave the 48 volt modules intact and use an inverter that accepts 48 volts.
It does make sense that if most of the loads to be supported by the battery are 48 volt DC, or higher voltage AC for which a 48V-supplied inverter is available, then keeping the battery voltage up and current down is preferable. It seemed like most of the planned loads were 12 volt, though...

Inverters, converters, chargers... all of them can presumably be the same as used in residential solar installations, which now normally operate at higher than 12 volts if they are of any significant size. I'm no expert on residential solar, but 24 V and 48 V system voltages seem common, although I've seen some up to 72 volts.
 
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