All Marine Air air conditioners run on AC power. Most units are available in 3 different power configurations:
Larger units are also available with 3-phase compressors. Some 60hz units can run at 50hz, but not all. Please check the spec sheets or with your Marine Air dealer if you have a particular requirement for international cruising.
The specification sheets will show the running current for the unit. Sometimes both cooling and heating amperages are shown.
To select the circuit breaker for the unit:
Multiply the running (heat) amps by 2.5 then chose the next size breaker.
If the seawater pump is wired with the unit (not on a pump relay), then add in the pump amps before multiplying by 2.5.
Wire sizing should be done per ABYC requirements. If running on a generator, make sure that it can handle the large starting inrush current of the compressor.
The best solution is to take the spec sheets to the generator supplier and ask for their help.