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Unread 10-18-2013, 11:20 AM   #1
Not Yet Wild
Yamaha
 
Join Date: Dec 2008
Location: Florida
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Default Charging Batteries / OBC Issues

since we bought the cart several years ago, we have been using the charger with a by-pass on the charger since the OBC does not work. The batteries are only 1 year old and bubble after only charging for maybe 4 - 5 hours after the cart has been completely drained. The volts meter only shows 48 volts when the bubbling starts. It is a 48 volt system with the powerdrive. After charging it only runs for maybe 2 miles before it completely drains down again to nothing, most of the time leaving us stranded and having to push it back home. Any thoughts on what might be happening. Thank you !
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Unread 10-18-2013, 02:22 PM   #2
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Harley Davidson
 
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Location: Missouri
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Default Re: Charging Batteries / OBC Issues

This is not a good situation!

First off, you are never supposed to let the pack get down to below 50% SOC. If you do, battery life will be shortened.

Second, bypassing the OBC is not good, as if you leave it unattended, the batteries will keep charging and will get overcharged. In your case it sounds like they are getting undercharged, which is just as bad...

So how exactly do you charge the cart?
Also, give us the serial number if you can. It's under the dash behind the GO pedal.
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Unread 10-18-2013, 02:38 PM   #3
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Default Re: Charging Batteries / OBC Issues

As soon as I get home I will send you the serial number. We just keep on eye on it and connect a volts meter. We don't charge it over 48 volts. It dies on us before we know it so it's not like we intentionally let it get this low. This just recently started happening. The fuse on the charging plug on the cart blew, we replaced it and thats when it started happening.
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Unread 10-18-2013, 02:53 PM   #4
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Default Re: Charging Batteries / OBC Issues

Quote:
Originally Posted by sweade View Post
We don't charge it over 48 volts..
This is why it's dying so quickly. During a charge cycle, a 48v pack can actually read above 60v. You should wait 12 hours after the charge cycle completes before you take your reading. If you look at the chart below, 100% SOC is 50.96 for a 48v pack. All of these readings are taken 12 hours after the charger has kicked off...

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Unread 10-18-2013, 02:54 PM   #5
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Default Re: Charging Batteries / OBC Issues

Really what you should do is replace the OBC. Charging it manually will harm the batteries and cost more money in the long run.
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Unread 10-18-2013, 03:37 PM   #6
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Default Re: Charging Batteries / OBC Issues

Are your batteries dry?
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Unread 10-18-2013, 03:51 PM   #7
Not Yet Wild
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Default Re: Charging Batteries / OBC Issues

Not at all.
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Unread 10-18-2013, 03:56 PM   #8
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Default Re: Charging Batteries / OBC Issues

jake is correct you are under charging them .. THIS IS REALLY BAD !!!!
if you want a correct charge you should run charger till the volts reach 60+ about 16hrs
shut off charger and let sit 12h to get a true reading
the bubbling is normal just make sure you have 1/4" distilled water over the plates in the batteries

read ---> Everything to do with batteries!

you can eather replace the OBC or get a DPI charger
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Unread 10-19-2013, 07:54 AM   #9
Not Yet Wild
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Default Re: Charging Batteries / OBC Issues

Here is the serial number you asked ofr A9748-624538
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Unread 10-19-2013, 07:56 AM   #10
Not Yet Wild
Yamaha
 
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Default Re: Charging Batteries / OBC Issues

Do you think the batteries are ruined now. How can I test the computer. I saw that there is a way to reset it. I don't know if that would work or if it is completely broken. What do you suggest ?
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