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Unread 04-12-2009, 11:41 AM   #1
Not Yet Wild
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Default Charging Problem

Hi! I am new to electric carting. Just bought a 48v Club Car. I couldn't get the charger to work so I bought a new one.

Dumb!!!

I then read that the batteries have to have a certain amount of charge to get the charger to kick on. My question is how much of a charge do the batteries need? I have 6- 8V Trojan PowerDrive batteries.

The individual baterry volts are:

3.59 3.18 4.25
5.29 4.20 2.43

Thanks for any help anyone can give!!!
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Unread 04-12-2009, 12:26 PM   #2
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Default Re: Charging Problem

From Trojan Battery Website:
State of charge as related to specific gravity and open circuit voltage

Percentage of Charge, Specific Gravity Corrected to 80o F, Open-Circuit Voltage 8V Battery

100% 8.49, 90% 8.41, 80% 8.33, 70% 8.25, 60% 8.16, 50% 8.07, 40% 7.97, 30% 7.88, 20% 7.77, 10% 7.67

It sounds like it's time for some new batteries! Trojan recommends to take your batteries down to no more then 50% to maximize their life and no more then 20% at any one time. Your batteries are far past that at this time.
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Unread 04-12-2009, 01:22 PM   #3
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Default Re: Charging Problem

You could try disconnecting the battery pack and individually charging the 8v batteries with a 20a 12v automotive charger for about an hour each to give them a little kick in the pants. Then measure the voltage on each battery, if they are close to chargeable, reinstall in the cart and see if the charger brings them up to charged status.
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Unread 04-12-2009, 01:57 PM   #4
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Default Re: Charging Problem

Thanks guys! I know I'll need new batteries soon either way. I just can't afford them right now. I'll try charging them individually to see if I can get by for a little while.

What voltage do I need for the charger to kick on?

Thanks
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Unread 04-12-2009, 02:54 PM   #5
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Default Re: Charging Problem

I don't have info on the charger and someone with knowledge can add comments but I would think all the batteries would have to be at least 7.5 volts each before they will take a charge.
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Unread 04-12-2009, 03:17 PM   #6
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Default Re: Charging Problem

It's a Thunderbull Charger.

Thanks for the information. Ill give it a shot!
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Unread 04-13-2009, 04:17 PM   #7
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Unhappy Re: Charging Problem

Hello All, I'm having the same problem with my 48v. My batteries were not as low. 7.77 was the lowest one.

At what voltage do you think the charger will kick back on to begin charging?

Should I get all my bats to at least 8.15 or higher.

Thanks for any help.

John
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Unread 04-13-2009, 06:45 PM   #8
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Default Re: Charging Problem

Quote:
Originally Posted by John Kissell View Post
Hello All, I'm having the same problem with my 48v. My batteries were not as low. 7.77 was the lowest one.

At what voltage do you think the charger will kick back on to begin charging?

Should I get all my bats to at least 8.15 or higher.

Thanks for any help.

John
Yes!

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Unread 04-15-2009, 07:35 PM   #9
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Default Re: Charging Problem

Thanks for all the help!

I replaced all the batteries and now I have a new problem. I hooked up all the batteries and the cart still wont go. The headlights come on and if I plug the charger in it kicks on. I do hear a click when I hit the gas pedal. Could it be a wiring problem?

Thanks for any help!
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Unread 04-15-2009, 07:46 PM   #10
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Default Re: Charging Problem

Quote:
Originally Posted by dougmcp View Post
You could try disconnecting the battery pack and individually charging the 8v batteries with a 20a 12v automotive charger for about an hour each to give them a little kick in the pants. Then measure the voltage on each battery, if they are close to chargeable, reinstall in the cart and see if the charger brings them up to charged status.
This is way too much amperage for a 12v charger on an 8 volt battery for this long
Quote:
Originally Posted by davis_d5 View Post
It's a Thunderbull Charger.

Thanks for the information. Ill give it a shot!
Too bad you did not use the search feature on the site. You could have easily found that the charger was good with those voltages and the $400 would have gone a long way towards new batteries.....

I urge every one new to golf carts to use the search and research before you buy! .... good luck with this
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