Besides the issue with frequency and motors, most of the stuff on your boat is 120v, not 240v, and works only because our (North America) power is split phase, two hots (that are 180 deg out of phase), a neutral in between and a ground (4 wires). Theirs will only be single phase, a hot, a neutral and a ground (3 wires). You would need some sort of transformer to split it before it gets to your boat. A balancing transform comes to mind, but as I recall from the inverter discussions before, they still require that the load be somewhat balanced (within 30%) so that would be an issue. It is tough because our system has two separate hots 180 deg out of phase, which is hard to replicate from a single phase system.