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Old 11th January 2007, 10:43 AM   #1
Hayden is offline Hayden  Australia
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Unhappy Wire gets hot

My wire is getting warm which means I知 loosing power but I知 using fairly large stuff I知 pulling up to 80amps some times at 15v about 1200watts,
I think I have 11awg is that enough? I have 8awg if it will fix the problem, is soundlink a good brand?
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Old 11th January 2007, 11:01 AM   #2
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I guess this is the 12V feed cable for a high-power amp in a car?

12AWG is 4mm^2 cross-sectional area and has a current rating of 40A.

10AWG is 6mm^2 cross-sectional area and has a current rating of 53A.

If you really are taking 80A then 11AWG isn't enough. 8AWG will be ok, but it's very thick wire!
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Old 11th January 2007, 11:01 AM   #3
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I used #6 stranded on a CB linear that drew about that

Wire = cool, connectors =
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Old 11th January 2007, 11:03 AM   #4
Hayden is offline Hayden  Australia
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I didn稚 mention its runs a brushless motor for my r/c car and the wire is just under 7inches long
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Old 11th January 2007, 11:05 AM   #5
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Oh, ok. I think the largest I've seen those is #12
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Old 11th January 2007, 11:18 AM   #6
Hayden is offline Hayden  Australia
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Are all wire the same because I知 using heavy speaker wire or should I be using proper brushless wire that I don稚 have.
There are 3 wires going to the motor the ones with the clear insulation.

Click the image to open in full size.
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Old 11th January 2007, 10:40 PM   #7
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Quote:
Originally posted by Hayden
Are all wire the same because I知 using heavy speaker wire or should I be using proper brushless wire that I don稚 have.
There are 3 wires going to the motor the ones with the clear insulation.

Are you sure the wire is heating up due to its resistance or is the resistance of the lugged connection causing heating that is traveling up the wire? The contact resistance is likely to be higher than that of the wire. If you replace the wire with something heavier but keep the lugs your wire may continue to heat up.

I_F
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Old 11th January 2007, 11:04 PM   #8
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Interesting point I_F.
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Old 11th January 2007, 11:09 PM   #9
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How does that tiny motor pull 80A without exploding? Have you put a meter on it?
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Old 11th January 2007, 11:10 PM   #10
AndrewT is offline AndrewT  Scotland
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What charge is in the battery pack?
1700 to 2000mAhr?

How long can you pull 80A in competition before the motor comes to a halt?
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