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<div>William,</div>
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<div>The charge controllers could operate in open loop, while the SMA did close the loop. Open loop works really well for charge controllers.</div>
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<div>I question if the closed loop communication was really working correctly if the SI is reporting 50% SOC when the batteries are reporting 95%… The SI should be getting its % info from the batteries…</div>
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<div>My thoughts are that the inverter needs to start frequency shifting at a lower voltage. If the closed loop communication isn’t working correctly, you could try setting a lower absorb and float voltage…</div>
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<div>I’ve had bad luck using open loop Lithium with SMA…</div>
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<div>If you were to consider switching out the inverters, consider putting in Fortress Envy inverters. </div>
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<div>-Kienan</div>
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<strong style="box-sizing: border-box;"><span class="ContentPasted0" style="margin: 0px; text-decoration: underline; display: inline !important; background-color: rgba(255, 255, 255, 0);">www.distribution.solar</span></strong></p>
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<blockquote type="cite">On Oct 24, 2023, at 9:20 AM, Chris Sparadeo via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:<br>
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<div dir="auto">Hi William,</div>
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<div dir="auto">That’s an interesting idea to have close loop comms with two separate manufacturers at the same time. In theory I think this could work, but unfortunately, I don’t think SMA and Schneider share the same protocol # for the eVault. I believe
SMA uses protocol #2 and Schneider uses #5.</div>
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<div dir="auto">Kindly,</div>
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<div dir="auto">Chris </div>
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<div dir="ltr" class="gmail_attr">On Tue, Oct 24, 2023 at 10:40 AM MDElectricSolar via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)">
<div dir="auto">I would tear all the sunny boys and sunny islands out and install two 15 kW Sol-Arks, problem solved. DC coupled. I've done this several times now for existing clients (mostly connected to the grid) but it is so much cleaner and more compact
and effective.<br>
<br>
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<div>Michael D Nelson</div>
<div>MD Electric & Solar, Inc.</div>
<div>707-684-0064 mobile</div>
<div>707-884-1862 office</div>
<div><a href="http://www.mdelectricsolar.com" target="_blank">www.mdelectricsolar.com</a></div>
<div><a href="http://www.facebook.com/mdelectricandsolar" target="_blank">www.facebook.com/mdelectricandsolar</a></div>
<br>
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<blockquote type="cite">On Oct 24, 2023, at 7:31 AM, William Miller via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br>
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<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">Friends:</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">This situation is as yet unresolved. It is complicated enough I created a
<a href="https://millersolar.com/MillerSolar/case_studies/36_SIFortress/36_SunnyIslandFortressIntegration.html" style="font-family:Verdana,sans-serif" target="_blank">
web page</a> to describe the scenario so I did not have to explain it over and over. I submitted this to Fortress tech support. They said they had likely not tested the Fortress compatibility with SI in an AC-Coupled system.</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">While Fortress technicians and/or engineers ponder the situation I am brainstorming solutions. One idea is to convert to a DC coupled system. DC Charge controllers will have
intrinsically better voltage control. The charge controller most likely suitable is the Schneider 600 volt 100 amp unit. I would need two of them. It is compatible with the existing string wiring. In researching it many questions came up about that product’s
suitability. There is an integration guide for a Schneider system and Fortress but this would be a mixed system of Schneider and SMA. Would I be able to apply closed loop communication to both systems? Could the charge controllers work in open loop? Has
anyone tried anything like this?</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">I will keep you apprised.</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">William Miller</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,sans-serif">Miller Solar</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,sans-serif">17395 Oak Road, Atascadero, CA 93422</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,sans-serif">805-438-5600</span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,sans-serif"><a href="http://www.millersolar.com/" style="font-family:Arial,sans-serif" target="_blank">www.millersolar.com</a></span></p>
<p class="MsoNormal"><span style="font-size:12pt;font-family:Arial,sans-serif">CA Lic. 773985</span></p>
<p class="MsoNormal"> </p>
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