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Unread 03-20-2014, 11:48 AM   #11
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Default Re: Alltrax 400 amp need more torque....bad

Torque is produced by Amps. Something is limiting your current if you don't have normal torque. Could be batteries themselves, cables, controller, motor.
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Unread 03-20-2014, 12:08 PM   #12
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Default Re: Alltrax 400 amp need more torque....bad

At 200 Amps, 6 gauge wire will drop about .08 volts per foot of cable and dissipate (waste) about 16 watts per foot. At the same current, 4 gauge would only drop .05 volts per foot and dissipate about 10 watts. If your required power in this example was 1 HP (746 Watts), you would be losing about 2% of your power per foot of 6 gauge and about 1.3% per foot of 4 gauge, for an improvement of 0.7% per foot of wire. If you have 8 ft. of wire, you would save 5.6% by changing from 6 gauge to 4 gauge and this would increase top speed and range about the same amount. If you want quicker starts and better climbs, you will need bigger cables. The voltage drop is significant when large currents are present, which will/does reduce performance on smaller gauge wire.
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Unread 03-20-2014, 12:34 PM   #13
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Default Re: Alltrax 400 amp need more torque....bad

Thanks again guys and a little more information. The batteries, motor, controller solenoid, and tires are basically new, so those shouldn't be an issue.

I sure thought the cable going through my OBC was my positive cable, maybe it's the negative, I'll have to check that out. Last time I checked I had 5v1 or 53v volts coming out of the pack. Another question, it sounded like you were saying the only wire hooked to the negative side of the pack should be the main negative power cable is this correct? No additional wired of any kind, say a 48v to 12v reducer? I don't have one but am about to add one.

One last question, it's obvious I need to upgrade the cables, would I get even more power by going to 2 gauge on the batteries or will not help since the other cables are 4ga.

All this is good information and thanks.
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Unread 03-20-2014, 12:36 PM   #14
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Default Re: Alltrax 400 amp need more torque....bad

I don't think your math is correct.
You calculated the voltage drop on the cable based on 200amps, but in the example of 1hp (746w), a 48v cart only requires 16amps draw (I know is more because the motor is not 100% efficient, but for calculation purposes only).
So the drop in the cable at this current is only 0.0064v or 0.1w or 0.014% power loss of the 746w.
Still a loss but not quite as dramatic, unless off course my math is wrong
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Unread 03-20-2014, 12:41 PM   #15
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Default Re: Alltrax 400 amp need more torque....bad

The way the original OBC system was designed to work depends on the OBC measuring the in and out current use.
There should be a single cable on the pack negative going thru the OBC, any other negative cables like a voltage converter should be connected to the controller B-, or the existing factory negative bullet connector that is already connected to the B- and provided for accessories.
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Unread 03-20-2014, 12:59 PM   #16
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Default Re: Alltrax 400 amp need more torque....bad

Great info sergio, I would have hooked the voltage connector up wrong for sure.
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Unread 03-20-2014, 01:07 PM   #17
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Default Re: Alltrax 400 amp need more torque....bad

There are different scenarios to consider the losses, I think we have it close enough LOL

I sat down one day and did the math and it all depends on the factors of what equipment you have etc.

HAWGsalot, unless your planning more upgrades later I'd just stick with the 4g wires, JMO.
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Unread 03-21-2014, 08:04 PM   #18
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Default Re: Alltrax 400 amp need more torque....bad

Yep. Already had the 200 amp calcs done and put that our there as an example. This might be a good frame of reference for the other contributor who referenced the maximum 160 amp spike through the controller.
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Unread 03-24-2014, 08:11 AM   #19
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Default Re: Alltrax 400 amp need more torque....bad

An update and question, first the negative cable does go thru the obc. Now one earler post said no other cables should be connect to this battery. Well my radio is connected to that battery should it be moved to another battery? Does it matter which one or does it have to be a specific one? Oh and I'm going from 26mph on flat ground to 16mph on long not real steep hills. Im going to change the cables but I can't imagine them making that much difference.

The motor is the stock club car motor that was put on it. Could there be a fault in the motor from the low battery condition before they were replaced? Anyway to reset it if so?
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Unread 03-24-2014, 09:12 AM   #20
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Default Re: Alltrax 400 amp need more torque....bad

Are you sure it's the stock motor? I don't see you getting to 26mph with a stock cart with 20" tires
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