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

[William Miller]

2.7 k ohms = about 37 C. Digi key or I can send you a few.

William Miller
Miller Solar.com
805-438-5600
www.millersolar.com


On Sun, Nov 12, 2023 at 5:27 PM Roland - RES via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> 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.
> <https://www.renewablenergy.com/>
>
> " 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 at 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 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
>>
>>
>>
>>
>> _______________________________________________
>> List sponsored by Redwood Alliance
>>
>> Pay optional member dues here: http://re-wrenches.org
>>
>> List Address: RE-wrenches at 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 at 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 at 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
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20231112/0946a8c0/attachment.htm>