Battery wires and cables? - SailNet Community
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post #1 of 5 Old 04-07-2012 Thread Starter
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Battery wires and cables?

I am looking for wires to the battery to the control panel what Gauge of wire to use! I am looking to have only 4 sources.. but i just dont know where to get these items at, i am putting a battery in my one hull, i have to wire it all up, make boxes for control panel and battery. the battery isnt going to be far from the control panel so i might just need 5 ft

but any input is greatly needed..

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post #2 of 5 Old 04-07-2012
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Re: Battery wires and cables?

Electrical Connections by Don Casey


Below is a great sitethe place to get wire online

GenuineDealz.com - Marine Electrical, Boat Wire & Cable, Custom Battery Cables

If you are getting a controll panel 5 ft from the battery you will need 2 gauge and also have to fuse the positive between the panel and the battery

BLUE SEA SYSTEMS Terminal Fuse Blocks at West Marine

Genuinedealz > Marine rated battery terminal from Blue Sea Systems

This set up will allow you to connect something like the bilge pump to one of the terminals direct and also send the second wire to the con trol panel. I would suggest you dont skimp on the size of the control panel switches as you may need the extra swtches at a later date. I like the Blue Sea Mmodels as they come pre wired also' I would also get a book on electrical systems


Dave


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Re: Battery wires and cables?

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Originally Posted by chef2sail View Post
...If you are getting a controll panel 5 ft from the battery you will need 2 gauge and also have to fuse the positive between the panel and the battery

Dave
The 2 guage would allow for an 80 foot run carrying 25 amps going both ways, one wire for ground and the other for hot. At 5 feet you could use 2 guage for an engine starter. What items are you going to power? It is very unlikely you would use more than 25 amps. That would completely drain a group 24 deep cycle battery in four hours. For 25 amps, 10 guage would work with a length of 10 feet both directions for the panel to battery. You should also be concerned about the length of wire runs from the panel. A mast head light with a 50 foot run would require 14 guage at 2 amps. My information comes from the book Boatworks, Selected Articles from Sail Magazine Editors
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post #4 of 5 Old 04-07-2012
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Re: Battery wires and cables?

I am not sure you are correct here and know Mainesail will come along eventually. I dont ever recall seeing 14 gauge wire from a battery to a panel.

The gauge of the wire doesnt draw down the battery its the devices hooked to its draw that counts. So whether you used 14 gauge or you used 2 gauge wire the draw woould be the same.

My suggestion is based on the following ( i understand large wire costs more also, so you might be able to get away with 4)
1- resistance. the larger the gauge the less the resistance therefore the least heat.
2- he was heading into a panel of undetermined size with the potential of having multimple connection on at the same time so the draw may be larger
3- I tend to over size the wire I use...better that then undersizing.

Whatever you use fuse it after the battery within 7 feet.

Dave


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post #5 of 5 Old 04-07-2012
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Re: Battery wires and cables?

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3- I tend to over size the wire I use...better that then undersizing.
This idea will also compensate for the loss of performance over time. As the wire gets older and potentially degraded the added capacity will help.
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