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The 12 DC volts/120 volts AC inverter can be used in a 220 volts AC area if you place a transformer 1:2 ratio to bring the voltage to 220 volts.
An auto transformer with the same watts that the inverter is capable, THOUGH it may be more economical to buy a 12 DC Volts/220 Volts AC out with the same operating frequency of the GRID.
You can not connect a 12 Vdc inverter to a 24 volts battery bank, the design does not allowed it, the system will blow out and "smoke and fire" damaging the inverter.
Nando