<div dir="auto">Christopher:</div><div dir="auto"><br></div><div dir="auto">Thank you. </div><div dir="auto"><br></div><div dir="auto">How is it that one can put optimized inverters in front of a standard MPPT algorithm? Don\u2019t they work against each other?<br clear="all"><br clear="all"><div dir="auto"><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><br>William Miller<br>Miller Solar.com<br>805-438-5600<br><a href="http://www.millersolar.com">www.millersolar.com</a><br></div></div></div><div><br></div><div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Nov 18, 2025 at 5:47\u202fAM Christopher Warfel 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"><u></u>
<div>
<p>I recently got the TS4 A-Os when I thought I ordered the TS A Fs
and was also worried about the possible fighting between the two
MPPT devices. As was under the gun for weather and end of year,
went with the AO's. Have you tried emailing
<a href="mailto:support@tigoenergy.com" target="_blank">"support@tigoenergy.com"</a>?</p>
<p>I went through AI and found this document:</p>
<p><br>
</p>
<p><img src="cid:ii_19a97ac5e96bfdb42cd1" alt="" style="width:932px;max-width:100%"></p>
<p><br>
</p>
<div>On 11/17/2025 11:44 PM, MDElectricSolar
via RE-wrenches wrote:<br>
</div>
<blockquote type="cite">
We are having no issues sourcing these from our primary vendor,
Greentech.
<div><br id="m_7631726865360386109lineBreakAtBeginningOfSignature">
<div dir="ltr">
<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>
</div>
<div dir="ltr"><br>
<blockquote type="cite">On Nov 17, 2025, at 7:11\u202fPM, 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>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">\ufeff
<div>
<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 having trouble locating these RSDs. Very few
vendors appear to have these and I can\u2019t get any to
call back and verify they have them. I can\u2019t get Tigo
to return my calls. Does anyone know if these are
discontinued?</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"">What
are the rest of you doing for rapid shutdown? I don\u2019t
trust Alps: I have heard too many horror stories. It
seems the form factor is too small to contain arc
suppression measures.</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"">Somewhere
I saw as an alternative the Tigo TS4-A-O. These are
optimizers. I worry these will fight with the MPPT
algorithm in the inverter or charge controller. There
is also the TS4-A-S which has shutdown and monitoring.</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"">All
input is welcome an appreciated. Thanks in advance.</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">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>
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<pre cols="72">--
Christopher Warfel, PE
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
(401) 447-5773</pre>
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