Interesting thread as I was just in contact with someone with a LGchem coupled to a solar edge inverter. He’s seeing at times 20-25% less capacity than rated kWh and pretty much never actual capacity. Tech support gives some wishy washy answers as to why this would be. Where is the difference, is it in the communication between units or the BMS? And funny as he’s never seeing more capacity.
Maybe there are some inaccuracies in the BMS’s? Standard OB, trimetric and midnight wiz bang meters all require frequent meeting of charge parameters ( volt/amps) to keep the devices accurate. I’ve got 4 meters that I compare and if they are full daily it’s about 1-2% difference between them. If it’s been 7-10 days since full, then they could be off by 10-15%+ off. Curious what others are seeing Jay Peltz power. > On Aug 18, 2018, at 9:40 AM, Jerry Shafer <[email protected]> wrote: > > Lou > Sounds like you are having the same issue we did, l adjusted the size of the > battery down to 50% of the battery rating and so far the values appear to > follow in. We will also be installing a DC CT on the egauge to see and have > a better idea of whats going and out outside of the BMU > Jerry > >> On Fri, Aug 17, 2018, 12:09 PM Lou Russo <[email protected]> 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 >> [email protected] >> 808 345 6762 >> Spree Solar Systems LLC >> CT-34322 >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/[email protected]/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: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/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: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
