What gauge wire for extending wiring? 50 pound thrust trolling motor

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  #1  
Old 07-05-11, 06:48 AM
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What gauge wire for extending wiring? 50 pound thrust trolling motor

I recently bought a 50 pound thrust Minn Kota, the leads are short and I need to add a few feet and a circuit breaker. What gauge wire should I use?
 
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  #2  
Old 07-05-11, 09:09 AM
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I could not see anything in their literature which lists the maximum amperage draw.

May I suggest that you call their technical Service at 1-800-227-6433. They should be able to tell you what gauge wire to use.
 
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Old 07-05-11, 02:19 PM
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Trolling motors generally pull the same amount of amps as the thrust size. So 50 lb thrust means 50 amp draw at wide open.
Then depending on length of run of the wire from source to device and back you get your wire size.
15 feet or less use #6...20 or 25 feet use #4 for 50 amp.
If you want to oversize and avoid hot wires if you run wide open a lot then use the 60 amp...15 to 20 feet run use #4...20 to 30 feet use #2 wire.
So it looks like #4 is the winner unless you have a long run from battery to motor and back. And yes you do have to figure in the run back in the equation.
 
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Old 07-05-11, 02:31 PM
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Here is a wire chart. It agrees with what Badeyeben says. I found it interesting.

Amps and Wire Gauge - 12V Circuit
 
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Old 07-06-11, 03:59 AM
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Also, use only marine-rated wires. They are ridiculously expensive but will last forever.
 
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Old 07-07-11, 02:20 PM
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On closer inspection, my 50# motor has #10 wire on it, I need to extend the wire 5 feet. Do you see any issue in just using #10 tinned marine wire? I'm putting my trolling battery on the floor in front of my console-below the platform. I just need to run up under the rail a few feet. My motor manual, while not giving me any of this info, recommended a 50 amp breaker which I installed at the battery terminal.

This is a Minn Kota Maxximizer V2 power drive
 
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Old 07-07-11, 07:28 PM
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Well 10 gauge wire is rated for 20 amp according to the chart. Even if it were rated 30 amp it would only do 1/2 of what the motor pulls at wide open. A 50 amp breaker with 10 gauge wire means the wire would dang near melt in two before kicking the breaker, if it ever did kick it. Your equipment not mine so you can do what you want!
 
  #8  
Old 07-08-11, 03:53 AM
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Are you confusing the charging wires with the power wires? #10 is usually used to recharge the battery, while #4 or #6 is used to power the motor. Similar to cars: #10 wouldn't last too long connected to the starter.

Remember, too, that you count both wires when determining distance. Five feet is actually a 10-foot wiring path.
 
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Old 07-08-11, 07:36 AM
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I just spoke to Minn Kota Tech Support, they say that if I am extending the wire less than an additional 10' that I can use #10 wire as came with the unit. Anything over 10' requires increased wire size. Based on all of the good input that I got from you guys, I guess I'm shocked too.
 
  #10  
Old 07-08-11, 02:32 PM
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Wow I am shocked. Maybe they are figuring the wire is out in the open and therefore will cool faster. And maybe they figure you won't be running it wide open for long periods of time. Or maybe it was a new service guy with no experience.
Did they say the warranty would still be good after the addition of wiring that size?
 
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Old 07-08-11, 05:47 PM
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Now you've got me worring, it was a female Tech Support person .... LOL

I'll just keep an eye on it tomorrow and see if it heats up. If they are recommending a 50 amp breaker, I was always taught to size fuses and breakers for max times 2, maybe its OK??
 
  #12  
Old 07-09-11, 07:42 AM
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I've installed car stereo amps using less than the rated wires. My thinking is, if it burns I can get out and run away. Can't say the same for a boat -- or a house, for that matter.
 
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Old 07-09-11, 08:01 AM
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I'd lay odds that it has something to do with the "Maxximizer" electronics. How could it possibly "extend battery run time" unless its regulating the current and voltage somehow?

Be nice to actually measure the current when in use.
 
  #14  
Old 07-10-11, 06:29 AM
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We used the motor all day yesterday, I did not notice any heat on the wires and we had no issues. We did however find out that a V2 Powerdrive can deploy itself in motion if the water gets rough :-(
 
  #15  
Old 07-25-11, 05:49 PM
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Update, used it a couple of times now and absolutely no issues. I checked the wiring multiple times and not even a hint of heat, of course it was almost 90 degrees outside each time. I can easily measure the current, I may do so sometime.
 
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