A follow up question to all of this: Does anyone know what parameters a BMS is using to determine SOC for lithium?
A project I installed uses the Orion BMS jr for lithium batteries. It uses a normal shunt, voltage and also measures internal cell resistance to determine SOC. Jay Peltz Power > On Aug 21, 2018, at 10:29 AM, Howie Michaelson <howie.michael...@gmail.com> > wrote: > > Allan, have you talked directly with Bogart? > Howie > >> On Tue, Aug 21, 2018 at 12:56 PM Sindelar Solar <al...@sindelarsolar.com> >> wrote: >> Wrenches, >> I would like to broaden this topic a bit, please: we're currently >> installing our first Blue Ion LFP set (48kWh). I work almost exclusively >> with existing off grid systems, often older systems most of which have >> TriMetric monitors, either the TM2020 or newer TM2030. Has anyone >> successfully reprogrammed a TriMet to accurately register SOC and other data >> with LFP batteries? If so can you provide some guidance as to program >> settings? >> Thank you, >> Allan >> >>> On 8/20/2018 6:15 PM, Lou Russo wrote: >>> Jay, >>> The batteries are Blue Ion 2.0 from Blue Planet Energy, the 8kWh cabinet. >>> The listed Maximum Continuous Charge and Maximum Discharge Rate is 1C. >>> >>> Aloha, >>> Lou Russo >>> >>>> On Sat, Aug 18, 2018 at 6:27 AM Jay <jay.pe...@gmail.com> wrote: >>>> Hi Lou, >>>> Can you tell us which LFP batteries? >>>> And what rates of discharge/charge? >>>> Jay >>>> Peltz power. >>>> >>>> On Aug 17, 2018, at 12:09 PM, Lou Russo <l...@spreesolarsystems.com> wrote: >>>> >>>>> Hello All, >>>>> >>>>> Does anybody have any insight in getting the SOC to report accurately on >>>>> the Outback FNDC when using batteries that have a minimal voltage curve? >>>>> I have several systems with LFP batteries that have both a eGauge >>>>> (communicating directly with the battery BMU) and a FNDC and I get wildly >>>>> different SOCs. In a typical 24 hour period (12am-12am) I get SOCs on >>>>> the FNDC that vary 2% to 34% of what the battery BMUs are reporting. I am >>>>> assuming that the BMUs are reporting accurately. I would think a 1%-5% >>>>> difference would be acceptable. >>>>> >>>>> Any help or thoughts on this subject would be greatly appreciated. >>>>> >>>>> Aloha, >>>>> Lou Russo >> -- >> Allan Sindelar >> al...@sindelarsolar.com >> NABCEP Certified PV Installation Professional >> New Mexico EE98J Journeyman Electrician >> Founder (Retired), Positive Energy, Inc. >> 505 780-2738 cell >> >> >> >> _______________________________________________ >> 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 >
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