Re: [Amel] Isolated or non Isolated DC to DC Convertor

David Pawley

Hi, more info please, as not that familiar with Amel. Is Amel systen 24V? is it an option to get a DC to DC converter that is isolted? and why have you chosen unisolated? you could get issues with interference esp from autopilot. Don't know much about radio installation but my reading of it is ground plane is not connected to Negative.
Broader question I have for you, if your engine block is connected electrically to the saildrive and under ABYC the shore earth is connected to your negative bus. How do you control electrolytic corrosion of your very expensive saildrive.
I believe the euro standard is pretty good certainly doesn't have the corrosion potential. I would think Amel went to some trouble to avoid allowing electrical connection between Shore earth/Battery Neg and saildrive. I would think that any connection between AC earth and DC negative, (sometimes happens in Battery charger) would compromise Amel DC circuit design. I would think any power supply for SSB should be isolated, but check this statement out.

Wave_rider and I'm boatless.

On 20 December 2013 10:12, <terencesingh@...> wrote:

I have given this thread much thought and also done some reading since opening up this topic for discussion.

I understand that our beloved boats were designed to have the negative side of the DC circuitry for any accessory home run to the negative side of the battery bank. I understand this and accept this.

I believe it is common practice in ABYC conforming boats to have the negative side of the battery bank tied to the engine block which the feed an Accessory negative bus. The negative side of all accessories on board are then tied to the negative accessory bus. I understand this and also accept this. Different concept.

Here is my question that I need help with.

If I use a Newmar  32-12-50 (24 to 12VDC to DC convertor 50 Amps) as a DC to DC convertor which is non isolated with the input  feed directly from the ships 24VDC battery bank, and the output feeding a 12VDC distribution panel and each branch circuit from that distribution panel powering the various accessories on the ship with a direct positive and negative home run from the distribution panel, am I compromising the Amel DC circuit design?

If the answer is no, does this hold true for a SSB installation?

Join { to automatically receive all group messages.