The only time I worry about temperature in a FLA is during a corrective EQ as opposed to a preventative EQ. If the cells are really way off I just EQ at the recommended V for 5+ hours and then measure SG. I have no worries unless the temp is outside the max recommendation. At that point I would terminate EQ. I would look at age and probably replace the bank. Pretty simple old mature technology. I have saved quite a few this way. Not always though.
For LFP I want the BMS to do the worrying about temperature. I still want to see temp on my monitor or phone. The way that the battery is constructed counts alot to me. It is easier to damage Lithium, I agree with you. Below is from one of the best makes I have seen and used. LiFePO4 batteries with LiFePO4 cells are the best for solar battery applications because they: are very thermally stable with no risk of thermal runaway; offer the longest cycle life; can be recharged at a high 1C rate; can handle heavy loading and high current discharge rates. For a solar installation to pass final inspection, the batteries must have been tested and approved to UL 1973. So, before making a final selection, verify that the battery selection you make has you covered. Rest assured, Discover AES LiFePO4 batteries meet this certification, so you can be confident that your customers batteries are safe and pass inspection. Our commitment to safety, reliability and certification also delivers the following. Safe and Maintenance Free Sophisticated High Current BMS Field Serviceable BMS IP 55 Rated IEC 62133 Safety UL 1973 Safety Certified UN 38.3 Transport Certified Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ e-mail offgridso...@sti.net text 209 813 0060 On Fri, 29 May 2020 08:44:56 -0700, Mark Frye <ma...@berkeleysolar.com> wrote: > Folks, > > A few questions: > > When charging a FLA battery, even though we use a three stage charging > regime controlling voltage/current, is it not true that the real goal is > to avoid excess temperature rise inside the cell generally? Do we worry > that excess current will cause localized excess heating with the cell > and subsequent mechanical breakdown? Do we worry that excess voltage > will cause some kind of electro-chemical breakdown? > > If control of excess temperature rise is not the goal of charge > regulation, what is the goal? > > Having defined the goal for FLA how is it the same or different for a > LiFePo? > > I am pretty sure it is much easier to damage a Li with bad charging, but > why? > > Thanks, > > Mark > > _______________________________________________ > List sponsored by Redwood Alliance > > 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 > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org _______________________________________________ List sponsored by Redwood Alliance 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 List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
