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Nordhavn 68

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Bulletin Board >> Discussion Forum >> Electrical Complexity

MessageAuthor Post Date
I was interested in your comment about simplifying the electrical system. From a European perspective the curious American 110/240 volt single phase system adds unnecessary complexity along with all the lighting and pumps on 24 volts DC. In my eyes a boat should be all 240/415 volts AC, the higher 3 phase voltage being confined to the larger loads in the engine room. DC voltages would not figure at all except for emergency lighting and the inverter source.

To this end I agree with you about a large inverter able to supply a good load during the quiet overnight period while at anchor or alongside. It amazes me that the likes of Atlas, ASEA and others do not make a 15 to 18KW unit in a single box similar in size to their shore power units. They should be able to synchronise with generators and shore power units so the power can be managed automatically with little human intervention. The electronics for this is relatively cheap and simple.

With regard to San Souci it seems to me that the invertors cannot run the whole boat including the all the air conditioning while underway, I might be wrong as I have not seen a electrical schematic for the boat. A modification which could be made in the future would be to replace the two cruise alternators with one 25KW+ 110/240 60 cycle alternator. I say 25+ as it should be large enough to power the whole boat including all the air conditioning.

I am sure the hydraulics are up to it as they can power the two large thrusters. The invertors would be used to charge the batteries using their 3 state regulation.

This is not meant in anyway to be criticism of your boat, is just my perspective on an aspect of modern trawler yachts.		Fyfield, Ted 2007-07-11 07:47:58