Wire gets hot

[Hayden]

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]

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]

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

Wire = cool, connectors =

 

[Hayden]

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

 

[Geek]

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

 

[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.

An externally hosted image should be here but it was not working when we last tested it.

 

[I_Forgot]

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]

Interesting point I_F.

 

[pinkmouse]

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

 

[AndrewT]

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?

 

[kvholio]

why not use silicon-insulated wire instead of larger diameter ?
It will withstand the heat better.
http://www.hobby-lobby.com/connectors.htm
Increasing diameter will only increase peak-current.
How hot are your motor , speedcontroller and battery-pack after a run ?

 

[Hayden]

I have never run a pack flat yet because I have always pranged it first the most I have got is around 15min and it flies
Its a 1200 watt brushless motor so is it 1200 \ 14.8 = 81A? the motor, batt and control gets just warm basically cold the speed control is a 160A continuous on a 14.8 3.7amp 20c lipo

I will change connections on my next motor