A simple rectifier style "buzz box" should solve this problem taking the voltage down to 110 to 120 VAC at 50 hertz. Unfortunately the plugs are all different and this method creates RF noise and is hard on some appliances combined with the lower 50 hertz line frequency.

We have thought about using a 220 VAC to 120 VAC transformer, but these are large and heavy and still have 50 hz coming out. There is also the option of a proper 50 hz battery charger ( our Zantrac isn't switchable to 220VAC if you can believe it! ) on a separte Euro-style socket, then running anything 120VAC through the inverter. This would be somewhat limiting, but would work. We still haven't decided what to do yet at this point.
Some people go so far as to have a generator for 120 VAC but the amount of work that would be, not to mention cost, is just beyond us at the moment.

As can be seen below, the plugs are ground fault protected, a good idea in a marine environment. These should work in tandem with the boat ground but one never knows until it it tried. I doubt the galvanic isolator would have any affect as long as the grounds are connected on the boat side.
 

2 full wave 30 amp rectifier bridges make up the 1.2 volt isolation required. Each must be connected positive to negative to allow AC current flow in the event of a short to ground, and must be of sufficient amperage to handle the plug current long enough to throw a breaker. Each shore power plug is a different configuration to make amperage limits "idiot-proof". Ours is a 30 amp plug, so the isolator must handle at least 30 amps. Each rectifier in these bridges can handle 30 amps, so in parallel they make 60 amps. Well within the safety zone.
 Because they are mountable via 1 bolt, saving expensive isolator hardware, Gena put them on some aluminum heat sink, compound and all, then covered it with some bent Lexan. ( Top of page photo )

The standard method in purchased units is 2 rectifiers one way, 2 the other.
 

Above right, I managed to make the center drawer for my desk finally! If it looks big that's because it is, 38" wide, just big enough to house, say, something as large as my Kawai keyboards for example. Because of the size and function of this drawer ( everyone will get a kick out of the final product I assure you! ) some special considerations must be made.

More in the next couple of days...
 

 It feels sort of good when something fits so well that one only screws it into place as a formality. Ha ha!

Something is still missing at the top. The "head plates" will cover the holes. These I left until last as they must grow as one moves to the bow. The inward slope allows plenty of counter space as predicted.

Just as a note, the reason one tambour is higher than the other is just because when I split it, there was an odd number of slats. A test piece of foam under the taller one makes it look even higher, so don't worry, nothing wrong with this girls' eyes!