Originally Posted by jbinbi
Someone should correct me if I am wrong, but I think the power should be the same in the sense that in NA if your device is using 4 amps st 110V, then it would use 2A at 220V, so the same power draw. So if you are limited to half the amps on the wire with 220, you might be able to use the same size wire. I am not an electrician. I also dont know if my 15A breaker on my 110 boat is a 7A breaker in the EU.
Its the amps that is the problem. More amps needs thicker wire, the higher the voltage, the less the amps. That is the reason why battery
cable has to be so bit. Low voltage, but a ton of AMPS.
At 15amp breaker is a 15amp breaker no matter the voltage, although usually rated for peak voltage due to other reasons.
Simple calculation to help understand a bit more
1000w Air conditioner at 110v = 1000/110 = 9 amps
1000w Air conditioner at 220v = 1000/220 = 4.5 amps
In either case, the air conditioner still draws 1000w of power, but due to voltage, the 220v only pulls 4.5 amps and doesn't require as thick of wire as the 9 amps if the same conditioner was running 110v.
Now think about that same AC running 12v. 1000/12 = 83 amps. You would need a 100amp breaker to be able to run the same AC unit of 12v some some crazy thick wire.
Just purchased 2010 Lagoon 400
has been converted to 110v, but I am also unsure if the factory cable is thick enough to carry 15amps, i will check when I get back to it. I might just run all new cabling for the outlets just to be extra safe.