Hi Jay, For our LFMP and LFP batteries, it has never mattered. As long as current is flowing, the SoC is increasing and the voltage will rise until it reaches the CV set point.
Typically cell balance occurs when a cell voltage reaches a set point where a load turns on across that cell. Typically about 3.55 V. When we see out of balance battery packs, we typically find that the bank has been habitually deficit charged. Someone has spread an idea that you should not fully charge your Li battery. (Thanks YouTube gurus) This leads to unbalanced cells over time. Each cell has a slightly different charge efficiency and the SoC will slowly drift. This affects all cells. Unbalanced cells lead to an apparent loss of capacity. We have LFMP banks sitting as back up power for 10 years now with a constant 3.6Vpc. No problems with just very low current maintaining the bank. Larry Crutcher Starlight Solar Power Systems On Jun 26, 2023, at 1:57 PM, Jay via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote: Hi All I’m wondering if minimum charge amps for lithium is common or not? Or does it have to do with the cell shape: cylindrical vs prismatic vs pouch? A client purchased some EG4 batteries and they are getting a bit out of balanced. Tech support didn’t suggest higher volts or longer absorb but did mention they need 30-50 amps charge. It’s not in the manual. Wondering what you all think and know Thx Jay _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org
