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Unread 07-28-2019, 07:27 PM   #1
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Default 1990 36 volt ezgo

Hello, so I'm new to all this so excuse my ignorance. I just bought this cart they said the batteries were going out but I dont think that is the case it is still holding a charge after 3 days of hardly any use. The problem I am having is after about 3 to 5 minutes of driving the cart it will just stop then after a couple of seconds it will go for a couple seconds over and over again. Then after a couple of hours of it cooling down it will drive fine for another 5 or so minutes. Any advice would be very appreciated Thanks

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Unread 07-29-2019, 12:43 AM   #2
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Default Re: 1990 36 volt ezgo

Sure sounds like your batteries are bad. Get a dmm and check them. Let them charge until the charger shuts itself off. Wait 10-12 hours then check the pack voltage. After that, drive the cart with the meter still attached and watch how far it drops when the cart is under load.

Here’s a state of charge chart.
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Unread 07-29-2019, 12:11 PM   #3
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Default Re: 1990 36 volt ezgo

Quote:
Originally Posted by orangeman6 View Post
Sure sounds like your batteries are bad. Get a dmm and check them. Let them charge until the charger shuts itself off. Wait 10-12 hours then check the pack voltage. After that, drive the cart with the meter still attached and watch how far it drops when the cart is under load.

Here’s a state of charge chart.
Thanks


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Unread 08-05-2019, 05:38 PM   #4
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Default Re: 1990 36 volt ezgo

This thread should have been posted in the regular E-Z-GO section, unless you are intending to go with a lithium replacement for your battery pack. This is the Lithium E-Z-GO cart section.

When it is shutting down, it's because the battery voltage is dropping below the point where the cart can go. When it sits "cooling off" as you mentioned, the batteries are recovering from that use a bit, then failing again when you try to go. Charge fully, then unplug and replug the charger to start a new charge cycle. Do this a couple of times. This assures that your battery pack is as charged as it can get. Wait about 12 hours after the last charge cycle to let the voltage stabilize, then measure the pack voltage and each individual battery. Write it down, to the hundredths of a volt. Example 36.72 volts pack and 6.12 volts for each battery that you test. A digital multimeter can give you that precise of a reading.

After that is when you begin testing the voltage levels again under load (while driving vehicle). Measuring how much the voltage drops under load is how you determine the health of your batteries. You'll want to check total pack voltage under load first, then check each individual battery if you really want to know the health of each battery.

Bob
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