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  Topic Review (Newest First)
4 Days Ago 04:46 PM
chuck53
Re: 12v system and 24v system on 1 boat at same time?

Quote:
Originally Posted by JimsCAL View Post
And a 9 year old thread rises from the ashes.
It's called newbieitis. Anytime you see years old threads resurrected, 99% of the time, it's a newbie dredging them up.

And...the OP hasn't posted here since 2008.
5 Days Ago 01:09 PM
Minnesail
Re: 12v system and 24v system on 1 boat at same time?

I was going to say "I wonder if he ever built his home designed 65' cat, I'm going to guess not."

Then I thought again! Maybe this was that Hot Rod guy that built the Home Depot boat near San Francisco.




Anyway, I have both 24 volt and 12 volt on my little boat. Two batteries in series to make 24 volts to run the trolling motor, a little DC-to-DC converter to make 12 volts to run everything else. Pretty simple.
5 Days Ago 12:43 PM
capta
Re: 12v system and 24v system on 1 boat at same time?

Wow, didn't even notice.
I wonder what became of this idea. Did he build his boat or knot?
5 Days Ago 10:16 AM
RobGallagher
Re: 12v system and 24v system on 1 boat at same time?

Quote:
Originally Posted by JimsCAL View Post
And a 9 year old thread rises from the ashes.
I call them "Happy Easter" threads.

Nothing like a good resurrection to get the party started.
5 Days Ago 09:40 AM
capta
Re: 12v system and 24v system on 1 boat at same time?

In the days of 32 volt marine systems it was quite common to have some things (like the gauges) run on 12 volts. Chris Craft did this, for one. It was a total headache and there were always problems determining which wires were which system.
Whatever you think you will save in 'cheaper' wire you will spend 10 times over on 24 volt equipment. The KISS principle will save your sanity and many, many hours of frustration and maintenance, never mind having to special order 24 volt equipment from a far off anchorage, if you plan to go cruising.
5 Days Ago 07:51 AM
JimsCAL
Re: 12v system and 24v system on 1 boat at same time?

And a 9 year old thread rises from the ashes.
5 Days Ago 04:59 AM
oldboatnut
Re: 12v system and 24v system on 1 boat at same time?

It is essential that the 12v negative and 24V negative are connected together. I have both on my boat mainly as I need 24v to start a large diesel its is also useful for 3500 lb windlass. 12 v gear is standard and easier to get , replace and service in most parts of the world, you could ring main in large cable say 35 or 50mm and then do short localised runs with a breaker where required. Old welders often have lengthy cables usually tinned copper of large diameter that can be picked up for cents in the dollar.
05-21-2007 07:55 PM
erps Look up the wiring for a series/parallel switch used on big rigs (trucks). 12 volts to run all the trucks accessories except the starter, which is 24 volt and activated by a solenoid that changes two banks paralleled to series (and it doesn't mess up the rest of the system)
05-21-2007 06:31 PM
BigCatOne
24 volts are better than 12 volts because...

24 volt is better than 12 volts, because the wiring is cheaper and you don't spend as much money heating wires. These engines have onboard computers and electronic injection. The engines use 12 volts to run, and won't run without it. I consider this the simplest approach, actually. I would make the whole boat 24 volt, if only the engines came with a 24 volt option.

And, I am having no trouble finding 24volt gear, except for 2 or 3 low draw electronic items, which I will power with a DC to DC converter, which costs about $85.

As far as I am concerned, 12 volt systems are an obsolete relic of the days when boats had much, much less electrical gear. Just price the cables to run a big electric anchor windlass with 12 volts versus 24 volts, and you will see my point. I'd go with manual, but this is a 65' boat we are talking about, and it will operate in coral waters, where a rope-chain rode isn't a practical option.

And, if it so common to do this, why can't I find one lousy wiring diagram for the idea?

I am designing my own boat, as I have been an amateur designer since the days of planimeters, splines, and French curves. I had a bad experience in 1971 sailing from Hawaii to Seattle, and decided to learn yacht design in self-defense. The construction method will be modified Kelsall, with a radius chine design. The radius chine will have a 2' diameter throughout, hand laid up, with the rest of the boat made by resin infusion on a flat table.
05-21-2007 05:52 PM
Giulietta To me...makes absolutely no sense...
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