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Voltage conversion (from 240VAC to 120VAC) isn't much of a problem, as a transformer can do that easily.
Frequency conversion, however, is more difficult (from 50 cycle European to 60 cycle U.S.).
If you have a healthy size inverter aboard, one strategy would be to run everything off your batteries, and to get a 12VDC battery charger which is capable of handling 240VAC/50 cycle shorepower. One such charger is the Sterling ProUltra series (ProMariner has almost identical ones, too) which will take "world power", i.e., just about anything you can find out there, and will work well with it.
Such a charger isn't cheap ($300-500 street) for a 20A, 40A or 60A very smart charger. But, these are by all accounts wonderful little chargers and can do that conversion job plus a lot more for you.
BTW, these chargers would also work well with your 120VAC generator, and they're power-factor corrected so are quite efficient when run from generators.
Even if you already have a good battery charger aboard, it might make sense to add one of these new ones to give the needed flexability and backup. Probably wouldn't cost much more, if any more, than other alternatives if you count materials and time.
Last edited by btrayfors; 01-07-2012 at 12:00 PM.