<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Maybe someone else knows differently but it was explained to me that the fortress batteries have a relay that disconnects the battery if the voltage gets to high or low. There isn’t any electronic device to change battery impedance besides what the actual cells are doing. </div><div dir="ltr"><br></div><div dir="ltr">Jay</div><div dir="ltr"><br><blockquote type="cite">On Nov 12, 2023, at 12:50 PM, Jerry Shafer via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="auto">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.<div dir="auto">Fun times </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun, Nov 12, 2023, 12:36 PM William Miller via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div class="m_-3151961674501850742WordSection1"><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">Friends:</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">I am still working on getting the E-vaults to play nice with the Sunny Islands and Sunny Boys.</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">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.</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">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!).</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">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.</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">I have documented my research <a href="https://millersolar.com/MillerSolar/case_studies/36_SIFortress/36_SunnyIslandFortressIntegration.html#Inhibit" target="_blank" rel="noreferrer">here</a>. There is a table of contents to take you to the latest information. I appreciate pertinent comments any of you might have.</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">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.</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">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…</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif"">William</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">Miller Solar</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">17395 Oak Road, Atascadero, CA 93422</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">805-438-5600</span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><a href="http://www.millersolar.com/" target="_blank" rel="noreferrer">www.millersolar.com</a></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">CA Lic. 773985</span></p><p class="MsoNormal"> </p><p class="MsoNormal"> </p></div></div>
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