Re: [Amel Yacht Owners] Re: Shore Power Configuration

Bill & Judy Rouse <yahoogroups@...>


I think that you are incorrect on required wire size. How did you calculate that it is wrong? Based on: Wire Circular mils =2 x ρ x I x L / (%Allowable Voltage drop of source voltage) 

4mm = 6 gauge...and 6 gauge is adequate for 230VAC 50htz for 200+ foot length at 3%Allowable Voltage drop.

Is it possible that you have made a mistake? Or, is it possible that your calculations of wire size are based on 110VAC common to the USA?

Also, I would assume that if Amel installed a 16 amp breaker in the lazarette that they would have used 16 amps for a reason...maybe because the vast majority of the 230VAC 50htz shore power connection in Europe and around the world happen to be 16 amp. There are some marinas with a 32 amp option, but not many. So, it is highly likely that the 16 amp breaker was intentional. We happen to be plugged into 230VAC 50htz 32 amp shore power now, but in this new marina, the 32 amp plug that we are using is the only one on our pontoon...30 other boats are plugged into 16 amps.

A word of advice to you. The last person you should doubt in terms of Amel systems design is Amel. And the last thing that you want to do with an Amel is to Un-Amel your Amel.

Also, I sent you a private message.

BeBe #387

On Tue, Nov 17, 2015 at 4:24 PM, James Wendell ms42phantom54@... [amelyachtowners] <amelyachtowners@...> wrote:


That definitely helps. So in your case all shore power feeds through the Mass GI 3.5, presumably protected by a 16A circuit breaker in the lazarette? Is that the size breaker you have?

I have a 32A breaker in the lazarette, which is too large for the 4mm2 wire Amel installed, and it would not safely protect that size isolation transformer.

I plan to change that to a 16A breaker and use a similarly- sized isolation transformer like yours (I am using the Victron 3.6 unit). I just want to be sure that the breaker doesn't trip all the time if AC loads exceed the 16 amps permitted.

Jamie Wendell
s/v Phantom Amel 54

On Tuesday, November 17, 2015 8:29 AM, "Wolfg ang Weber webercardio@... [amelyachtowners]" <amelyachtowners@...> wrote:

For your Information. 
This is the answer from Mastervolt concerning the Installation of charger/inverter on Amel 54

"The AC is not connected to the DC terminals inside, the DC is floating to the housing.
however, the AC input is not galphanic isolated from the shore, for this you need a isolation transformer, and create your own ships ground in your boat.
the combi Ultra has an option to switch on a ground relay, this means the neutral in AC output will be connected to the ground in inverter mode automatically. in charger mode (this means there is a AC input like a shore connection, then this relay will be deactivated, because theoretical, the hot and neutral line can be swapped, and you don't want the hot line to be connected to the ground.
our high frequency isolation transformer is 88000355 mass GI 3,5

hope this helps,

best regards, 
Edwin van der Kroon"
Any comment ?  Wolfgang Weber SY ELISE  Amel 54 # 162

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