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

[Jerry Shafer]

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 at 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
>
>
>
>
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