On some LFP batteries the cell balancing only happens at full charge, so you do need to get to full every so often. Discover AES is one that needs this.
Brad On Sat, Nov 19, 2022 at 10:10 AM Dana Orzel via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Another issue is what charge controller are you using? I know for me with > Outback products I’ve had to switch from an FM 80 to the OB - FM 100 in > order to have a more accurate high-voltage cut out voltage. > The FM 100 has a much more accurate micro processor in it then the FM 60 > or 80 per Brad Bassett with AEE. > > Dana Orzel > C: 208.721.7003 > E- d...@solarwork.com > > On Nov 19, 2022, at 7:15 AM, Jeff Clearwater via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > > Hi Kris > > What voltage do you have your charge settings at? > > I recommend that bulk or absorb voltage for lithium iron phosphate not be > set above 56 V - there is no reason for it even though many manufactures > suggest higher settings. In cases where total storage is sized > generously enough I often use 55.6 or even 55.4 in order to target 95% as > full instead of 100% in order to extend cycle life. and for float there’s > no reason to ever go over 54 V and better maybe even to be in the mid-53s. > > See if that helps assuming you had it higher. > > The other thought is you have one bms that is perhaps not protecting > overcharge and allowing a temporary spike when the others do limit. > > Hope that helps! > > Best Jeff C. > Village Power Design > > > > Sent from my iPhone > > On Nov 19, 2022, at 6:32 AM, Kristopher Schmid via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > > > Greetings all, > > I have seen an issue on two different systems that I am hoping someone can > shed some light on for me. One was a 48 volt pack of 12 volt Battle Bornes > and the other was a 24 volt pack of SOKs. What happens is when reaching > the end of the bulk charging stage, the battery voltage spikes and sends > the inverter into an overvoltage error. Can anyone explain what is > happening and a solution? > > Thanks, > Kris > > Shine On! > > Kris Schmid > Legacy Solar, LLC > 137 West 1st Avenue > Luck, WI 54853 > www.legacysolar.com > 715-653-4295 > NABCEP Certified PV Installation Professional > Licensed Wisconsin Master Electrician > BSEE > _______________________________________________ > 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 > > _______________________________________________ > 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 > >
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