I spent some time looking through the archive, but couldn't find what I'm
looking for--> I think I have one weak cell in my 40 cell 100 Ah pack; I'm
getting a low battery signal (mini BMS) under load when there is more than
sufficient range left on the charge. These are CALB batteries which I
installed in December 2012. I recently tried going through and individually
charging each one to 3.5v (after charging the whole pack to shut-off point)
with my variable power supply, and at 2 amps maximum, it took me almost 2
weeks of not driving the EV (http://www.evalbum.com/4181) to get all the
way through, so I used a timer, which of course, would defeat the whole
process by not being able to WAIT for 3.5v on every one...
When I first started driving it with the new pack in 2012, it did have the
40 mile range I aimed for when I put this together. I have only driven it
to the limit of the pack once since then, and it was in a colder winter
than we usually have, so I wasn't surprised to have much less range.
I need an easy to put together load I can use with a voltmeter to test
cells, and a range for what voltage drop on these CALB cells would be
normal or weak. I got fairly good at this with lead acid, both flooded and
AGM, but don't have the experience or science to know if, 1) this is a
reasonable way to proceed, and, 2) what those voltage-drop decision points
would be, and, 3) what components to use for the load?
Thank you!
Michael B
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20160623/fd3e157a/attachment.htm>
_______________________________________________
UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub
http://lists.evdl.org/listinfo.cgi/ev-evdl.org
Read EVAngel's EV News at http://evdl.org/evln/
Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
