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Old 10-24-2015, 01:30 PM   #1
firefighter3803
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Default 2011 TXT 48V. Hesitation during acceleration.

I bought used from a dealer and they put new batteries in it upon purchasing. I noticed when the batteries are at 5/8 - 1/2 according to the gauge on the dash I push the accelerator and the cart will start moving and stop and move again all during pressing the pedal to the floor. Its like it looses power then kicks back in as I continue accelerating. I took it back to them and they supposedly replaced the batteries. I played 27 holes of golf and ran it on the road and it has done it again. Doesn't do it with full charge at all. I am kinda illiterate to golf carts as this is my first on but i have changed a motor in a vehicle just so you know i am a shad tree mechanic. Thanks for any help in this matter and if I didn't give enough info please ask.
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Old 10-24-2015, 05:15 PM   #2
JohnnieB
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Default Re: 2011 TXT 48V. Hesitation during acceleration.

New batteries should be fully charged prior to their first use and then charged after every use thereafter.

The LED bar-graph type battery meters lie more than politicians, so get a DMM (Digital Multi Meter) and measure the actual voltage.

A 48V pack should read 50.9V about 12 hours after the charger shuts off automatically.
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Old 10-24-2015, 05:29 PM   #3
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Default Re: 2011 TXT 48V. Hesitation during acceleration.

Thanks for the reply. I will check that in the morning. In your opinion would this most likely be the problem as it doesn't hesitate every time the accelerator is pushed.
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Old 10-24-2015, 05:38 PM   #4
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Default Re: 2011 TXT 48V. Hesitation during acceleration.

It sorta sounds like the controller is going into low voltage shutoff, but it might be something else.

The battery pack is the heart of the system, so let's make sure it is healthy first.
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Old 10-24-2015, 05:48 PM   #5
firefighter3803
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Default Re: 2011 TXT 48V. Hesitation during acceleration.

Ok it's on charge now. Thanks agin for your response.
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Old 10-25-2015, 12:04 PM   #6
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Default Re: 2011 TXT 48V. Hesitation during acceleration.

I tested the battery pack and it is reading 51.2 volts. I started charging at about 2:30 yesterday and it is now 12 pm.
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Old 10-25-2015, 12:27 PM   #7
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Default Re: 2011 TXT 48V. Hesitation during acceleration.

That is about right for new batteries.

Take it out for a test drive.

What Make/Model are the batteries?
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Old 10-25-2015, 01:29 PM   #8
firefighter3803
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Default Re: 2011 TXT 48V. Hesitation during acceleration.

They are US Battery Deep Cycle 8-volt. US8VGC is all I see on them. I wish I knew how to take a pic of them. Out running it now it is doing perfectly fine right now. But like I said it normally only does it when this battery meter on the dash is that about half that's the only time it does that hesitation during acceleration.
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Old 10-25-2015, 03:23 PM   #9
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Default Re: 2011 TXT 48V. Hesitation during acceleration.

US8VGC is an 8V 170AH battery and the range of a 48V 170AH battery pack is roughly equal to that of a 36V 225AH battery pack that was standard in earlier Model carts.

The chart I posted earlier was for Trojan batteries and their clones, Attached is the chart for US Battery batteries, which have a higher voltage when fully charged. (The attached chart was sent to me by the Senior VP of Engineering - US Battery less than two years ago, so it ought to be fairly accurate.)

Your batteries only have an At-Rest voltage of 51.2V and are new, so they might not be getting fully charged.

What Make/Model charger do you have. (Not all chargers charge US Battery batteries fully.)

-------------
As previously mentioned, the LED bar graph type battery meters are notoriously misleading, so keep your voltmeter in the cart and when the cart starts to misbehave, let the battery pack rest at least 15 minutes (30 minutes to an hour preferred) and measure the voltage. Then use the chart to determine what the SoC (State of Charge) is.

-----------
What I suspect is happening:

The voltage of a 48V battery pack drops at least 1.5V for every 100A of current being drawn from it. That is from the internal resistance of the batteries alone and the resistance in the high current cables, contacts and connections will increase the drop to nearly double that or about 3.0V per 100A. If the cables, contacts and connections are in poor condition, the voltage drop per 100A can be even higher.

The motor draws the most amps during acceleration from a standstill, so the voltage drop is greatest while accelerating. I'm not sure which controller is in your cart, but if it is in the 300A range, your battery pack could be dropping about 9V when your take off.

As the battery's SoC get lower, the pack voltage not only decreases, the amount of voltage drop per 100A increases. (Partially discharged batteries have higher internal resistance)

At some point the Under-Load battery pack voltage may be going low enough to trigger the under voltage error and shut down the controller.

The dealer ought to have a handheld programmer and be able to review the error logs.
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File Type: png US Battery SoC vs OCV table from USB.png (185.3 KB, 0 views)
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Old 10-25-2015, 04:01 PM   #10
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Default Re: 2011 TXT 48V. Hesitation during acceleration.

I have the ez go PowerWise Qe charger. According to your chart at 100% I should be getting 51.3 and I am getting 51.2 so it seems I am getting full charge. Am I reading the chart correct? I will let it do it again and test like you said. Dang now I have to go and play a few rounds of golf!! Would changing the controller help or is it all batteries? Thanks again for your help!
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