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Unread 05-13-2015, 07:33 AM   #1
JDC
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Default Batteries drain fast

I'm working on a utility cart its 48 v. They say the batteries loose power after about 20min. I test the pack last night. Its 50.2 v across the pack and each battery was 6.4 v. I jacked it up and pushed the throttle and it takes off normal and then looses speed and there is also a squeaking sound coming from the motor. if I let off and push it again it does the same thing. I'm sure I've jacked up other electric carts and they never did this. Any ideas ?
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Unread 05-13-2015, 08:32 AM   #2
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Default Re: Batteries drain fast

Is it 6 v batteries or 8 v batteries? How old are the batteries?
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Unread 05-13-2015, 10:00 AM   #3
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Default Re: Batteries drain fast

their 6 volt the date I haven't checked yet.
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Unread 05-13-2015, 10:17 AM   #4
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Default Re: Batteries drain fast

So it runs fine for 20 minutes then just suddenly drops off or is it a gradual thing? If you stop then take off again does it go normally or is it still slow like loosing power?
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Unread 05-13-2015, 10:42 AM   #5
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Default Re: Batteries drain fast

Sounds like tired batteries to me.
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Unread 05-13-2015, 04:12 PM   #6
JDC
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Default Re: Batteries drain fast

I'm just going by what I was told so I think ill drive it tonight and see what its doing.
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Unread 05-13-2015, 04:35 PM   #7
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Default Re: Batteries drain fast

This cart has 8 - 6 volt batteries in it?
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Unread 05-13-2015, 08:56 PM   #8
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Default Re: Batteries drain fast

it has 8 6 volts batteries. I did find 6 cells below the plates 1 on two and 2 on two batteries. I add distilled water to above the plates on those that were low. I had to install a rear seat on another one tonight so I didn't get to run it yet to see how long it lasts. The batteries are stamped 02 or D2 I think its a D the cart is a QT0750-848414 is it a 2007
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Unread 05-16-2015, 08:52 AM   #9
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Default Re: Batteries drain fast

So I had it totally charged over night and check voltage it was 52v I went for a drive last night for about 8 min. at full speed there were some smaller grades where it lost a little speed which I would say was normal came back measured voltage it was 51v and there was no heat to the touch on the controller. I did space the controller out about 5/8 of an inch from the mounting plate so air could get around it for more cooling.
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Unread 05-16-2015, 10:28 AM   #10
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Default Re: Batteries drain fast

Quote:
Originally Posted by JDC View Post
So I had it totally charged over night and check voltage it was 52v I went for a drive last night for about 8 min. at full speed there were some smaller grades where it lost a little speed which I would say was normal came back measured voltage it was 51v and there was no heat to the touch on the controller. I did space the controller out about 5/8 of an inch from the mounting plate so air could get around it for more cooling.
That mounting plate is a Heat Sink it is designed to Draw the heat from the controller and dissipate it, you will end up burning up the controller without it, think of a CPU in a computer and the big heat sinks they use.
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