Your generator probably outputs 50Hz sine wave, so look for a battery charger that allows 220-240 volts using 50Hz. There should be plenty. Ensure the charger outputs the correct voltage for your battery type. Flooded batteries use lower voltages than LiFEPo4. Most modern chargers are capable of supporting most battery types.
You're correct. 50 Hz sine wave at 230 volts rms (single phase to neutral) or 400 volts rms (three phases). The inverter tolerates 80 to 1000 volts as per data sheet. I just worry about compatibility of pulsed DC, which a simple rectifier would produce from the generator's AC.
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