Wire gets hot

Hayden · 11th January 2007, 10:43 AM

My wire is getting warm which means I’m loosing power but I’m using fairly large stuff I’m 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?

Ouroboros · 11th January 2007, 11:01 AM

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!

Geek · 11th January 2007, 11:01 AM

I used #6 stranded on a CB linear that drew about that

Wire = cool, connectors =

Hayden · 11th January 2007, 11:03 AM

I didn’t mention its runs a brushless motor for my r/c car and the wire is just under 7inches long

Geek · 11th January 2007, 11:05 AM

Oh, ok. I think the largest I've seen those is #12

Hayden · 11th January 2007, 11:18 AM

Are all wire the same because I’m using heavy speaker wire or should I be using proper brushless wire that I don’t have.
There are 3 wires going to the motor the ones with the clear insulation.

I_Forgot · 11th January 2007, 10:40 PM

Quote:

Originally posted by Hayden
Are all wire the same because I’m using heavy speaker wire or should I be using proper brushless wire that I don’t 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

Cal Weldon · 11th January 2007, 11:04 PM

Interesting point I_F.

pinkmouse · 11th January 2007, 11:09 PM

How does that tiny motor pull 80A without exploding? Have you put a meter on it?

AndrewT · 11th January 2007, 11:10 PM

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?

11th January 2007, 11:04 PM	#8
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Interesting point I_F. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

11th January 2007, 11:09 PM	#9
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	How does that tiny motor pull 80A without exploding? Have you put a meter on it? __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

11th January 2007, 11:10 PM	#10
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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? __________________ regards Andrew T.

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11th January 2007, 10:43 AM	#1
Hayden diyAudio Member Join Date: Aug 2004 Location: Mackay Australia	Wire gets hot My wire is getting warm which means I’m loosing power but I’m using fairly large stuff I’m 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?

11th January 2007, 11:01 AM	#2
Ouroboros diyAudio Member Join Date: Dec 2003 Location: Nottingham UK	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!

11th January 2007, 11:01 AM	#3
Geek diyAudio Member Join Date: Sep 2004	I used #6 stranded on a CB linear that drew about that Wire = cool, connectors =

11th January 2007, 11:03 AM	#4
Hayden diyAudio Member Join Date: Aug 2004 Location: Mackay Australia	I didn’t mention its runs a brushless motor for my r/c car and the wire is just under 7inches long

11th January 2007, 11:05 AM	#5
Geek diyAudio Member Join Date: Sep 2004	Oh, ok. I think the largest I've seen those is #12

11th January 2007, 11:18 AM	#6
Hayden diyAudio Member Join Date: Aug 2004 Location: Mackay Australia	Are all wire the same because I’m using heavy speaker wire or should I be using proper brushless wire that I don’t have. There are 3 wires going to the motor the ones with the clear insulation.

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