Changing AC from 100v 50hz to 120v 60hz

[mitiempo]

Originally Posted by roland stockham

Because the 100v is a typo, there is no such thing as 100v AC, never heard of 100v dc systems either. It is either 120v for N American standard or 240v for European.
It is possible the op has measured the actual voltage coming out of the dock receptical on a pontoon and found it to be 100v which is not uncommon but it is still nominally 120v. (also a reason I prefer my own inverter as a power source!!)

Japan is 100 volt AC. Electricity in Japan

The op has stated that the boat is of Japanese origin.