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Unread 09-06-2009, 11:31 AM   #61
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Default Re: How does 48V 2001 Club Cart OBC function?

Well, thank you gentlemen....I am a much more educated owner.....I have 'saved' several notes throughout the post that I hope I will never use! Thanks again.
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Unread 10-07-2009, 05:44 PM   #62
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Default Re: How does 48V 2001 Club Cart OBC function?

DrBob: I live in the villages too. Is there any trick to replacing the obc? Any components that need to be discharged before you remove and replace the obc? Would appreciate your input. Thanks Dan
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Unread 10-07-2009, 10:33 PM   #63
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Default Re: How does 48V 2001 Club Cart OBC function?

I've had a 2001 DS Regen for over a year it has never had an amber light on the dash, I've never seen another 2001 till reading this post so I didn't think anything of it, now I've realized someone removed the amber light and put the batter meter in the spot of the light.... Just never dawned on me to check.
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Unread 10-09-2009, 10:54 AM   #64
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Default Re: How does 48V 2001 Club Cart OBC function?

DrBob: Is there any trick to replacing the obc or do you just remove and replace.Thanks
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Unread 10-20-2009, 03:44 AM   #65
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Default Re: How does 48V 2001 Club Cart OBC function?

Quote:
Originally Posted by dpdn08 View Post
DrBob: Is there any trick to replacing the obc or do you just remove and replace.Thanks
Sorry for the delayed reply.

I did not replace my OBC myself. On a 2001 DS, I would imagine that you would disconnect the battery back at the plus and minus terminals and remove and replace the OBC exactly as it came off, then reconnect the battery pack, negative side first, then the positive side.

The new OBC will have a learning period as it has no record of the previous charging or discharge of the batteries. I would imagine after a dozen charges or so, a couple of which wear the batteries down to about 42 volts (on 48 volt system) while driving full speed, the OBC will learn the condition of your batteries and operate normally.

If you can't put a digital voltmeter on the pack while driving, just drive the cart until you sense it will not go the normal full speed while floored, and that will be fine. On new batteries, that may require driving 30 to 40 miles. It is OK to do it over the course of several trips while not charging in between trips. The yellow lamp will have gone on about half way to the desired discharge level, so do not be alarmed when it stays on for the last half of your driving.

There may be some other precautions you need to take, depending on your model and year that others would be more qualified to answer than I.

If no one else chimes in on this thread (since your question is a tad off topic), I would start your own thread with that specific issue.

Good Luck.
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Unread 11-07-2009, 02:10 PM   #66
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Default Re: How does 48V 2001 Club Cart OBC function?

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Originally Posted by DrBob View Post
Hi Old MEC

See my answer to Wpns as much applies to your case too in regard to putting non-stock batteries into a CC.

As far as what happens in general when a individual batteries go bad, that is not the subject of this thread and is probably answered elsewhere or the subject of another thread. I can only make an educated guess on what the OBC will see and may do about it.

First, note that the individual batteries are NOT monitored by the OBC - which controls the charger. The OBC can only sense what is happening to the pack, run some rudimentary "tests" and continually measure the pack voltage it expects for the current it is making the charger deliver vs those parameters for a pack of normal batteries.

The OBC tests seem to involve measuring the pack voltage during:

1. The 1-2 second shutoff of the charger about 10 seconds after start of charge.

2. The way that the pack voltage responds to the continuous current the OBC asks the charger to deliver.

3. The few seconds shut off of the charger at exactly 1 and 2 hours into the charge.

4. The occasional 5 minute shutoff (followed by resumption) of the charge by the OBC each hour near the end of the equalization phase. I have documented this behavior several times in detail, but not shown the graphs.

So the OBC will try and charge the pack as if the batteries are normal, routinely does tests (1-3 above) on the pack during charge and may do an extra test (4) during the equalization phase. Perhaps test (4) is to adjust for abnormal batteries or is part of retraining when a new OBC - Pack marriage takes place, or... I have seen it on about 10% of my plots.

I suppose the OBC may extend the equalization phase or cause it to execute more frequently if it "thinks" that there is an abnormal battery. I can not say much about this, as fortunately, I do not have or want an abnormal battery.

The OBC can not do anything directly to individual batteries (much less cells) - only to to the pack as a whole.

The OBC would be much better at sensing an abnormal battery, than fixing it.

And in MHO, your terminology and spelling are just fine! Thanks for your contributions.
Dr.Bob: I live in the villages too,and would like to discuss a problem I'm having with my 2001 and 1/2 obc and charging system.My charger goes down to 10 amps [aprox] and then just grinds away not going down farther. I replaced the obc to no avail. I need help. dpdn08
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Unread 11-07-2009, 02:17 PM   #67
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Default Re: How does 48V 2001 Club Cart OBC function?

Sounds like you have a bad battery
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Unread 11-09-2009, 03:01 AM   #68
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Default Re: How does 48V 2001 Club Cart OBC function?

Quote:
Originally Posted by dpdn08 View Post
Dr.Bob: I live in the villages too,and would like to discuss a problem I'm having with my 2001 and 1/2 obc and charging system.My charger goes down to 10 amps [aprox] and then just grinds away not going down farther. I replaced the obc to no avail. I need help. dpdn08
As ScottyB said, it may well be one or more bad batteries. The charger is dumb. It will continue to charge until the OBC stops pulling the gray wire of the 3 pin charging plug low. The OBC will keep this wire low until it either senses that the energy expended since the last charge has been replaced or 16 hours pass, in which case the OBC gives up trying to charge the batteries.

Get digital voltmeter and check the battery voltage pre-charging and during the charge, especially when the charger hits the 10 amp plateau. Record the battery voltage across each battery. The batteries should be read the same as each other at any point in the charge, plus or minus about 0.1 to 0.2 volts. Any battery excessively below the average probably has some plates shorted; any reading above the norm has failed due to plate corruption, sulfination, loss of battery fluid, etc.

Note that if you have used the cart for a long trip - like 20 miles, it will take perhaps 6 or so hours to replace the energy and the charger will typically maintain a current above 10 amps for most of that period.

I have attached an example plot of the charger current (amps in red ink) vs time after a 16 mile golf outing. Note the charging current was between 15 and 11 Amps for the first 4.3 hours.
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Unread 11-21-2009, 08:56 AM   #69
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Default Re: How does 48V 2001 Club Cart OBC function?

Hello from another person in The Villages! I have a 2001 Club Car DS with two year old 48V Trojan batteries. Last week, we were out for a long drive. At about 23 miles, we began to notice a reduction in performance and the yellow light began flashing. We arrived home after 27 miles with a very noticable loss of performance, but I believe we probably could have gone 30 miles without the cart halting. At what point during discharge does the light begin to blink and what is the significance? I know that the batteries should not be discharged below 80% of capacity to prevent battery damage, but how does one know when the 80% point has been reached?
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Unread 11-27-2009, 09:57 PM   #70
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Default Re: How does 48V 2001 Club Cart OBC function?

This may be off topic but i see that a few, are posting replies stating that you are traveling 20+ miles at a time. I also have a 2001 cc 48v, 1 and 1/2 year old trojan batteries, ( all load test good) but only get approx. 10 miles before I can tell a substantial drop in performance,(cart gets slow and no torque). battery light has never come on even when cart stopped due to low batteries on very slight incline. I thought this was normal until now. leaving charger on until its cuts off by its self, I get mixed results, (sometimes cart runs longer that others even on same road as before, 4 to 5 miles deference.) could this be a problem with the obc, and if it would help me, what is the purpose of reseting obc.
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