Regarding the SI Inverters,for me it works best to eliminate the bat temp sensor and put in a resister set to be 75 degrees, this will prevent the charger over under charge issue. Fun times
On Sun, Nov 12, 2023, 12:36 PM William Miller via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Friends: > > > > I am still working on getting the E-vaults to play nice with the Sunny > Islands and Sunny Boys. > > > > With Open loop I was getting significant discrepancies in the reporting of > SOC in the e-vaults versus that reported by the SI inverters. This > discrepancy did not diminish over time. The discrepancy caused > unacceptable charging and generator operations. > > > > I got Closed loop hooked up, but I found that every few days the SI > inverters would shut down due to a battery over-voltage condition. I > believe that when the e-vaults are near 100% SOC the BMS units increase the > battery impedance which means any charging current applied will cause the > voltage spike I have been seeing. I was able to measure these conditions > myself on site, although they were very fleeting and required recording > with the Fluke87 Min-Max function (love this meter!). > > > > I was able to extract log files from the Sunny Island primary inverter and > perform some analysis. It appears when I turned on remote BMS on the SI > (as part of the Closed loop protocol) it disabled the Frequency-Shift Power > Control. This means the SI inverters have gone from having poor control > over battery charging to having no control over battery charging. > > > > I have documented my research here > <https://millersolar.com/MillerSolar/case_studies/36_SIFortress/36_SunnyIslandFortressIntegration.html#Inhibit>. > There is a table of contents to take you to the latest information. I > appreciate pertinent comments any of you might have. > > > > By the way, if anyone has called SMA tech support for help on a Sunny > Island system, you have likely been asked to extract log files, zip them up > and send them off for review (and waited a long time for a reply). I am > the kind of guy who does not like to wait for solutions and who likes to > figure out things for himself. I have taught myself how to evaluate those > log files. I will be posting a web page on the subject. In the meantime, > if you are interested, two of my analysis Excel sheets are linked in the > case study. I will be expanding on this and providing resources to any > integrator that wants that knowledge. > > > > Thanks in advance for any insight. I hope I am wrong about this and I am > just missing something. I also hope revealing my headaches will help > someone someday… > > > > William > > > > Miller Solar > > 17395 Oak Road, Atascadero, CA 93422 > > 805-438-5600 > > www.millersolar.com > > CA Lic. 773985 > > > > > _______________________________________________ > 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