Re: [Amel Yacht Owners] 30 Amp 125 volt shore power to 50 Amp 125/250 Volt plug?
Bill Kinney <greatketch@...>
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I am sorry if I confused people. You are of course correct, if a boat was changed, then who knows what it might look like. High voltage wiring is really, really risky to if you do not understand the what’s and whys of what you are doing and the details of all the connections. I should supply more caveats about that.
I tried to be clear that my comments applied ONLY to a boat with the optional Amel installed transformer wired as Amel originally intended. The standard configuration Amel built without the transformer (most of them, I believe!) is different and requires different shore power connections.
On boats with an Amel installed transformer as Amel installed it, there is a dedicated 120 volt shore power feed to the transformer which then feeds the 220 volt system on the boat so delivering 120V single phase power to the boat is perfectly acceptable. That is what the transformer is there for! So 125V single phase power is how I routinely connect to US marinas because it is how my boat was designed by Amel.
Like you, I have never seen a marina that did not have 50A 125/250 volt service, but I have seen many marinas that did not have 50A-125/250 at every slip. (Like the slip I am in right now…) So I greatly appreciate the flexibility Amel built into my boat.
With the transformer, Amel gave me the option of using a 30A-125V or 50A-125V, or 50A-125-250V with one cord, (and suitable inexpensive adapters), OR 220V directly with a separate cord. For my travels around the US it has been great, because when the marina asks “What kind of power connection do you need?” I can say “Whatever you have!”
Right now I am plugged into a 30 AMP 125 Volt plug and the boat systems are powered with 220 Volt 60 Hz power. Of course no transformer changes the frequency of the power, so that stays the same as the supply in all cases.