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Unread 07-21-2014, 10:09 AM   #1
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Default Charger problem

I recently bought a 1991 DS 36V with no batteries. I have a good used set that I put in and it does run. An ACCU POWER Automatic Charger came with it. I plugged it in yesterday afternoon and it came up to 23-25 amps. The batteries were not discharged much so I expected to come out this morning and it would be fully charged and cut off or down to 4-5 amps at most. It was at 15 amps and the batteries were pretty warm and has been bubbling and venting. I cut it off and the Voltage measured 38.9 volts.

The charger appears to work like it should except that it is not tapering/cutting off the charge. Any ideas from the experts?

Thanks in advance for your help.

Paul
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Unread 07-21-2014, 10:32 AM   #2
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Default Re: Charger problem

Do the batteries hold voltage after being off charger for 12 hours?
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Unread 07-21-2014, 10:59 AM   #3
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Default Re: Charger problem

They were at 37.8 before I put them in and ran it about a mile.
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Unread 07-21-2014, 11:12 AM   #4
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Default Re: Charger problem

here is trouble shooting guide and pdf fie of manual
Attached Images
File Type: png accupower charger.png (49.6 KB, 0 views)
Attached Files
File Type: pdf accu-power.pdf (421.3 KB, 0 views)
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Unread 07-21-2014, 05:23 PM   #5
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Default Re: Charger problem

CTD -

Thanks for the info. I'm pretty limited on chargers but it looks like #8 is the one I need to be looking at. These batteries were in my wife's EZGO and have always been charged with the digital EZGO charger. They usually are at 37.5 - 37.9V 12 hours after they were charged.

I have 2 questions. 1) Would the charger still be at 15 amps after 12-14 hours with this battery pack? 2) Would the timer affect the number of amps and not tapering after quite a few hours of charging or does it only cut off the timer after so many hours of charging?

Thanks again.
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Unread 07-21-2014, 05:37 PM   #6
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Default Re: Charger problem

1) yes ... a fully charged pack (36v) is 38.3v after 12hrs rest
here is a chat to show at rest volts


so your old batteries are at 70% of full charge, and not showing enough volts to shut off charger and it keeps trying but won't shut off

2) charger has a 16hr shut off controlled by timer, the relay controls the amps
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Unread 07-21-2014, 06:02 PM   #7
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Default Re: Charger problem

You cut the charger off and the voltage was 38.9, seems I read somewhere it should get to 42 or so on a 36 volt pack. Like a 48 volt will get up to about 63 volts. Just things to think about.
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Unread 07-21-2014, 06:11 PM   #8
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Default Re: Charger problem

CTD,

OK

So, even if the voltage was 38.9 volts when I took them off the charger, the charger would still be going at 15 amps? According to your chart, my old batteries are 80-90% after a 12 hour rest. At what point would the charger start tapering the charge or cut off the charger completely? Is there a maximum number of hours it will charge regardless of battery charge or will it cut off automatically after a set number of hours?

Sorry for all the questions but this is a brave new world for me and I'm trying to make sense of it all. If my batteries are 80-90% best case scenario, will this charger never work properly (taper and cut off) ? If it is always going to keep charging at least 12-15 amps with less than 100% batteries, what is the best way to charge these batteries to their max?

Thanks again.
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Unread 07-21-2014, 08:54 PM   #9
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Default Re: Charger problem

Quote:
Originally Posted by mrgolf View Post
You cut the charger off and the voltage was 38.9, seems I read somewhere it should get to 42 or so on a 36 volt pack. Like a 48 volt will get up to about 63 volts. Just things to think about.
cut off is between 44v and 45 v for 36v charger

Quote:
They usually are at 37.5 - 37.9V 12 hours after they were charged.
i thought that was with an ezgo charger

Quote:
So, even if the voltage was 38.9 volts when I took them off the charger, the charger would still be going at 15 amps?
yes ... it goes down in amps at end of charge to equal out pack

Quote:
Is there a maximum number of hours it will charge regardless of battery charge or will it cut off automatically after a set number of hours?
most chargers shut off at 6 hrs regardless of volts

Quote:
what is the best way to charge these batteries to their max?
at this point i'm not sure ...only thing i could suggest is trying another charger on your cart and see if it acts the same
Quote:
I cut it off and the Voltage measured 38.9 volts.
Quote:
They usually are at 37.5 - 37.9V 12 hours after they were charged.
38.9v is over charged 37.5v is under charged

we need a log
1) pack voltage
2) each battery
take a readings (1&2) now, log it
fill batteries with water
run cart around a little , 15min or so
take readings(1&2) log it
plug cart in
take reading (1) log it
let charger run
take reading and log (1) at 6hr, 10hr & 16 hr mark (set timers or alarm)
if charger is at 44.5+v at 16h mark unplug charger
if charger is less than 44v let it run another 2 hours or until it is above 44v
take readings (1&2) log it
wait 12hrs take readings 1&2
post your results here
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Unread 07-21-2014, 09:36 PM   #10
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Default Re: Charger problem

CTD,

Will do.

I just checked the pack after 12 hours off charger and it is at 37.7V. Four of the batteries (Trojan T105) are between 6.24 & 6.28V. One is at 6.34V and one is at 6.17.

I'll check again in the morning and start the process.

Thanks for all your help.

Paul
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