Wrenches. Mark Any good Lithium ion phosphate tech battery has a BMU that protects the battery from over charge and over temp, different brands may have different ways and values, In most cases the inverter battery temp sensor is not used on a LFP batteries and the BMU will control both battery internal temps and voltage. A good LFP battery has very high round trip efficiency reducing temperature converting to heat both charge and discharge FLA is less susceptible to voltage but temps will damage the FLA and the BTS is very important and will help to prevent meltdown, it is important to monitor and fill FLA's in the event of either temps or voltages higher then recommended. Sealed AGM is very susceptible to over voltage and high temps and will damage the battery that it may not recover from. Battery management systems or Units are a great addition to the battery back up and off grid technologies and the BTS is a old school way to monitor the battery and it is very important to have the sensor between the batteries as much in the center as possible and I have seen systems shut down due to high temps that resulted from a shorted battery causing over voltage overheating the remainder and shutting down the inverter. There are several Lithium technologies, all with different characteristics, some are light weight, some are flammable, some will last forever, some are inexpensive so check out the tech in your battery, phosphate, cobalt, manganese, magnesium, lead, and iron, plus many more out there. Jerry
On Fri, May 29, 2020 at 8:45 AM 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 > >
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