03-02-2020, 02:59 PM | #11 |
Bonafide Nincompoop
Join Date: Dec 2015
Location: Charlottesburg Va
Posts: 8,987
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Re: Battery charging
Really should be getting higher than that, but it could be the OBC maybe just needs a reset.
Disconnect the pack negative for about 10-15 minutes so the OBC will reset. Then hook it back up and plug the charger in. Let it run until it turns off. You can't check battery voltage within a few minutes after the charger turns off, because that will always be an inflated number. Need to wait about 12 hours after the charger turns off before checking the at rest voltage. There is a surface charge from the higher voltage that the charger applies to the pack that hangs around for several hours after the charger turns off, and to get an accurate "at rest" or "state of charge" voltage you have to wait until that surface charge tapers off. That long last phase of the charge process is there to help equalize the voltage of each cell in the pack, and as the cell voltages get further apart that finish phase can take longer than normal, or longer than it should. The OBC reset will do basically an equalization charge and its going to stir up the electrolyte in the cells (they're gonna bubble alot) and the finish phase is probably going to take longer than what it normally will. The OBC needs two charge cycles to re-evaluate the pack after a reset. So try not to interrupt the charge cycle (unplug the charger) unless it has run for more than 16 hours. At 16 hours the OBC is programmed to time out, and should turn the charger off even if it hasn't yet reached it's cut-off point in the charge cycle. If it is running for that long, and not shutting off, then you'll need to keep a closer watch on the pack voltage during charging and make sure it's getting over 58.3v at some point during the charge cycle. |
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03-02-2020, 05:21 PM | #12 |
Getting Wild
Join Date: Jul 2017
Location: Lexington, SC
Posts: 93
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Re: Battery charging
OK, I will do the reset again. Maybe I stopped charge too soon, but the batteries were doing a lot of bubbleing and gurgling. Didn't want to blow up a battery.
I will wait until tomorrow to do the reset and charge so the batteries and charger can take a rest. The voltage has dropped now after 2 hours to 52.8 on the battery pack. Thanks for your help!! |
03-04-2020, 12:50 PM | #13 | |
Getting Wild
Join Date: Jul 2017
Location: Lexington, SC
Posts: 93
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Re: Battery charging
Quote:
Thanks again for your help!!!! |
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