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Unread 07-13-2016, 09:28 AM   #11
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Default Re: Alltrax XCT: Understanding Max Motoring Amps

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Originally Posted by joesam View Post
I guess it wouldn't hurt to put a voltmeter on each battery one-at-a-time and climb that same hill with each one. That will tell you if one of them is super-weak and is leaving the rest of the pack to pull-the-load. You said 49.8 when you just pull the plug (I assume the charger is off and has been for a while at that point - not just immediately when the charger clicks off....right)? Fresh/healthy packs do show well above 50 with the pack at rest.
How long after pulling the plug (removing the batteries from charging) should I wait before I can consider it a reliable reading for a freshly charged pack? I just installed a voltmeter in my cart that runs directly off the battery pack. I'll have to test each battery under load if it sounds like the battery pack may be the issue.
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Unread 07-13-2016, 10:02 AM   #12
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Default Re: Alltrax XCT: Understanding Max Motoring Amps

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I just installed a voltmeter in my cart that runs directly off the battery pack
Good then you will be able to monitor the voltage while charging. It should rise to about 58v and the current will drop to about 5a. It will stay like that for a couple of hours (depending on much they were run down) and shut off.
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Unread 07-13-2016, 10:18 AM   #13
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Default Re: Alltrax XCT: Understanding Max Motoring Amps

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Good then you will be able to monitor the voltage while charging. It should rise to about 58v and the current will drop to about 5a. It will stay like that for a couple of hours (depending on much they were run down) and shut off.
Ok, so it jumps up to around 61v while charging (charger is running), once the charger kicks off, it drops to 54v. Then slowly trickles down to a 49.1 resting spot.
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Unread 07-13-2016, 10:26 AM   #14
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Default Re: Alltrax XCT: Understanding Max Motoring Amps

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trickles down to a 49.1 resting spot.
That's pretty darn low (65% capacity) - the individual battery volts under load may tell you the final tale.
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Unread 07-13-2016, 10:39 AM   #15
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Default Re: Alltrax XCT: Understanding Max Motoring Amps

Check each individual battery and see if some voltages are way out of line with the others.
It's starting to sound like bad batteries. What kind of batteries do you have? At 61 volts you're also overcharging your batteries.
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Unread 07-13-2016, 11:00 AM   #16
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Default Re: Alltrax XCT: Understanding Max Motoring Amps

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Originally Posted by jjance View Post
Check each individual battery and see if some voltages are way out of line with the others.
It's starting to sound like bad batteries. What kind of batteries do you have? At 61 volts you're also overcharging your batteries.
This cart might be owning me and my wallet.

Ok, so I'm using the PowerDrive3 charger and PD+ batteries (says distributed by Club Car on them). I have no idea how I'm over-charging them or how to fix this.

Also, a little clarification on the voltage drops after charger clicks off the battery pack. Once it gets down to about 50.2v the trickle gets very slow. After about an hour of coming off the charger, I'm sitting at about 49.8v. It appears this will continue to drop very slowly over the next few hours. 49.1v is just what I saw the meter at this morning so I assumed it was the resting spot.

Side note: I do have a voltage converter attached directly to the battery pack and no kills switch. Could this be part of my problem? Just throwing it out there.
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Unread 07-13-2016, 11:06 AM   #17
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Default Re: Alltrax XCT: Understanding Max Motoring Amps

One more question. Does your battery light flash or do anything when you disconnect the charger? That would indicate not being fully charged.
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Unread 07-13-2016, 11:15 AM   #18
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Smile Re: Alltrax XCT: Understanding Max Motoring Amps

Do you have a multimeter? If so use your meter set at the proper voltage range to check each battery individually for resting voltage. You don't need to remove any wires for this test. What you are looking for is any battery in your pack that is lower voltage than the others. This will help identify a possible bad battery. The other test is to leave the multimeter attached to one battery at a time and drive the cart up the hill to see how low the voltage drops with each battery under load. Even with all the testing the net result probably will be the same as my original post...bad batteries. The converter hooked up to run all the time should not cause an issue...it would be better if it was switched but many of them did not have that provision. They only draw power when a 12v accessory like the lights are on. I may not know everything that the experts know but I have been around batteries for over 30 years and have learned a thing or two.😎
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Unread 07-13-2016, 12:07 PM   #19
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Default Re: Alltrax XCT: Understanding Max Motoring Amps

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Originally Posted by jjance View Post
One more question. Does your battery light flash or do anything when you disconnect the charger? That would indicate not being fully charged.
I have never seen the battery light come on.
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Unread 07-13-2016, 12:10 PM   #20
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Default Re: Alltrax XCT: Understanding Max Motoring Amps

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Originally Posted by theboss20 View Post
Do you have a multimeter? If so use your meter set at the proper voltage range to check each battery individually for resting voltage. You don't need to remove any wires for this test. What you are looking for is any battery in your pack that is lower voltage than the others. This will help identify a possible bad battery. The other test is to leave the multimeter attached to one battery at a time and drive the cart up the hill to see how low the voltage drops with each battery under load. Even with all the testing the net result probably will be the same as my original post...bad batteries. The converter hooked up to run all the time should not cause an issue...it would be better if it was switched but many of them did not have that provision. They only draw power when a 12v accessory like the lights are on. I may not know everything that the experts know but I have been around batteries for over 30 years and have learned a thing or two.😎
Well I appreciate the help. I will run a test on each individual battery at resting, but how much of a difference would be concerning? .5v or more?
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