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03-10-2011, 09:50 AM
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#1
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Guru
City: Whittier AK
Vessel Name: Apache II
Vessel Model: 1974 Donald Jones
Join Date: Oct 2007
Posts: 3,147
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Advantages of a 24 volt system
Is there any real advantage to having a 24 volt system on your boat?
SD
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03-10-2011, 10:11 AM
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#2
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Senior Member
Join Date: Jun 2008
Posts: 182
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RE: Advantages of a 24 volt system
Using the electrical equation E=IR, a higher voltage means less current. Less current translates into lower wire size for a given run. That's one advantage, particularly for a larger boat with longer wire runs.
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03-10-2011, 10:40 AM
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#3
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Senior Member
City: Seattle
Vessel Name: Fluke
Vessel Model: Krogen 42
Join Date: Apr 2010
Posts: 131
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RE: Advantages of a 24 volt system
I was just reading that newer electronics have internal regulators that can use 9 to 30 V input. One size fits all...
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03-10-2011, 11:26 AM
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#4
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Guru
City: Gibsons, B.C., Canada
Vessel Name: Island Pride
Vessel Model: Palmer 32'
Join Date: Oct 2007
Posts: 4,409
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RE: Advantages of a 24 volt system
As Red pointed out less current and thus smaller wiring. SOmetimes a bit more tolerance for Vdrops but still limits.
However, for most of us NO, particularily if you have to change things to get it = expensive.
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03-10-2011, 12:51 PM
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#5
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Grand Vizier
Join Date: Jan 2010
Posts: 3,815
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RE: Advantages of a 24 volt system
I put 24 v in Delfin, but also had to have 12 v for the appliances that weren't available as 24 v, so yes, I saved some money on smaller wiring because of the lower amperage needed compared to 12 v, but this was offset by added complexity at the panels.* If you're going to run a lot of wire, sure.* Otherwise, probably not so much and almost certainly not if you're retrofitting since you probably can't completely avoid at least some 12 v circuitry.
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03-10-2011, 12:58 PM
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#6
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Master and Commander
City: Vallejo CA
Vessel Name: Carquinez Coot
Vessel Model: penultimate Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 12,559
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RE: Advantages of a 24 volt system
For better or worse, my boat is coming with 24-volt DC, and 110-volt AC.
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03-10-2011, 01:06 PM
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#7
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Senior Member
City: Auckland
Vessel Name: Pioneer
Vessel Model: Westcoaster 53 converted to pleasure
Join Date: Nov 2007
Posts: 323
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RE: Advantages of a 24 volt system
If your boat comes with 24v as ours did, or it's an option on a new boat, it's great.
Reduced current means less voltage drop. "Everything is brighter and works better" is the best I can describe it, e.g. the 24v toilet has a lot of grunt!
However, some items can be a little hard to find - some light bulbs for example, and you may need*a 12v convertor in order to run a VHF radio,*car stereo*or laptop.
I certainly wouldn't convert to 24v from 12v, or let it influence a buying decision unduly, but would definitely specify 24v on a new build.
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03-10-2011, 01:19 PM
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#8
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Guru
City: Everett Wa
Vessel Name: Eagle
Vessel Model: Roughwater 58 pilot house
Join Date: Oct 2007
Posts: 2,919
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RE: Advantages of a 24 volt system
It the smaller wire size that is the limiting factor as the smaller wired sized for 24 volt will not handle the 12 volt. So you could be stuck with 24 volts.* *However, wire sized for12 volt wire will hand the 24 volts, so you can change to 24 volts if you want to.* There are *two applications on the Eagle that 24 volts might be better, windless and starting the engines.*******
So if you re not sure, best to run wire sized for 12 volt.
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03-10-2011, 01:25 PM
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#9
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Master and Commander
City: Vallejo CA
Vessel Name: Carquinez Coot
Vessel Model: penultimate Seahorse Marine Coot hull #6
Join Date: Sep 2010
Posts: 12,559
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RE: Advantages of a 24 volt system
I'd hope that the builder/installer was using 24 volts to provide more power rather than*reducing costs*by using*thinner wire.
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03-10-2011, 02:16 PM
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#10
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Guru
City: Mooloolaba
Vessel Name: Flora
Vessel Model: Timber southern cray boat
Join Date: Oct 2007
Posts: 1,859
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RE: Advantages of a 24 volt system
I have a 12/24 /240 Volt system on my boat.
As the engine was 24 volt that is what we started with. 2 x 15 watt voltage reducers to run stuff which at that stage had to be 12 volt.
This has worked well for me.
The 24 V is more efficient but the downside is that 24 volt equipment is more expensive than 12 V and in some instances the chandelery does not carry it.
items such as lights, bilge p/ps etc.
Benn
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03-10-2011, 04:17 PM
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#11
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Guru
City: St Augustine,Fl
Join Date: Sep 2009
Posts: 3,789
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RE: Advantages of a 24 volt system
Most if not all the Furuno electronics are designed to run on 12 or 24 volts without change/modification.
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03-11-2011, 02:54 AM
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#12
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Guru
Join Date: Oct 2007
Posts: 22,553
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RE: Advantages of a 24 volt system
The more modern engines frequently need 24 for their injection computers.
24 is great as the 12V for the few items needing it can be produced by a Vanner ( www.vanner.com/ )
12V bulbs are cheaper and can be has in 12V for interior and reading lamps and 14V for running lights.
Our outfitting method is bulk purchases of wire and almost everything is 10ga, so 12 or 24 only detirmines the CB size.
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03-11-2011, 04:46 PM
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#13
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Guru
City: North Charleston, SC
Join Date: Sep 2010
Posts: 4,869
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RE: Advantages of a 24 volt system
In theory, 24 volts would be better than 12 volts. In practice, since it is uncommon and few appliances are available in 24 volt versions, it is not something that I would consider.
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03-13-2011, 05:50 AM
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#14
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Guru
Join Date: Oct 2007
Posts: 22,553
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RE: Advantages of a 24 volt system
A really great reason for some 12v is the ability to use RV goodies.
www.fantasticvent.net/
Is one example of a really great product.
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03-13-2011, 11:03 AM
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#15
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Guru
City: Tuckerton, NJ
Vessel Name: WIRELESS ONE
Vessel Model: 36 Gulstar MarkII
Join Date: Mar 2011
Posts: 938
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RE: Advantages of a 24 volt system
You can always use (2) 12VDC batteries in series or any combination that gives 24VDC with the abilty to take a feed at the 12 volt mid point. Then run one feed to the 24VDC panel and the other feed to a 12VDC panel. You could have the best of both worlds if needed based on the battery AH rating.
I run mostly modern Garmin equipment and all of the new devices will run from 9VDC to 30VDC. I have never tested them below 10.5VDC or above 28.5VDC. Even their VHF100 through 300 radios accept a wide range of DC voltages.
Bill
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03-14-2011, 03:48 AM
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#16
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Guru
Join Date: Oct 2007
Posts: 22,553
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RE: Advantages of a 24 volt system
"You can always use (2) 12VDC batteries in series or any combination that gives 24VDC with the abilty to take a feed at the 12 volt mid point. Then run one feed to the 24VDC panel and the other feed to a 12VDC panel. You could have the best of both worlds if needed based on the battery AH rating."
This guarentees the rapid death of both batts in the hookup.
One from discharging the other from over charging.
The Vannier actually does this by switching from one batt to the other , a couple of times a min, so both go up and down TOGETHER!
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