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
>
>
_______________________________________________
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

Reply via email to