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A Multiplus is designed to work with one input/output voltage only. You'd need to adapt the incoming AC voltage to your Multi and the rest of your AC system. You can use a 220 to 120 volt transformer (auto or isolated winding) to bring the 220 v South American power down to 120 volts.
An alternative is to use separate charger (Phoenix or Skyla) and inverter (Phoenix). Victron chargers operate on a wide range of input voltages and frequencies.
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