Re: [RE-wrenches] Integrating Fortress E-vault maxes into an SI AC-coupled system

[Roland - RES via RE-wrenches]

Jerry, I have an upcoming project where I will need to add the resister to eliminate and batt temp charging corrections. I have not done this before can you provide where I could find a twister to achieve this? Mahalo, Roland Shackelford President / Owner NABCEP PVIP #091209-162 Office 808.775.7410 Mobile 808.938.9239 Power Solutions for Generations Renewable Energy Services, Inc. " Where there is integrity, there will be trust. Where there is trust, there will be an atmosphere for success." - Sadhguru On Nov 12, 2023, at 10:51 AM, Jerry Shafer via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:  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.  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

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