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Yeah sounds like it charges at fewer milli-amps than 30, thats what guessing gets you.
The second part depends. If the charge unit you are buying allows for step-down(allows you to choose 220 or 110) then obviously you can use either for the outlet itself, but definitly do not plug it up at 220 if its supposed to be 110. Theoretically it will charge twice as fast, but in reality it will just burn the batteries charging them too fast.
the only two laws you need to know are V=IR, Voltage = Current *resistance, and P=IV, power=voltage*Current. The first if you double the voltage at the same resistance the current doubles. alot of the time thats not a terrible problem because its for a very short period and systems allow for the increased voltage through Zener diodes that limit the voltage to X(sort of what ever you want) so it can take the fluctuation. However when you are talking 110 volts not millivolts to 220 volts I am pretty hesitant to say the system can handle that for extended periods(more than a few minutes).
The second is how you determine charge rate. 10KW= voltage*current, 10,000/220= current in amps. So at 50 amps and 220volts it charges in one second.
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