<div dir="ltr"><div><div style="font-family:verdana,sans-serif" class="gmail_default">Were these Tigo TS4 A-Os or A-Fs? If A-Fs, are there similar stories about the A-Os?</div><br clear="all"></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">Howie Michaelson<br></div></div></div><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Thu, Nov 20, 2025 at 11:33\u202fAM David Buckner 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:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg-5622325128163804641">
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We have a multitude of these same issues with the TS40-A-F. We followed every new guideline from Tigo in order to avoid corrupted signals but still had issues. After a hot breezy day in NJ last year caused a Tigo failure to spread the roof caught on fire
and caused millions in damage. Thankfully no one was injured. We spent the rest of 2024 pulling 6 MW's of Tigos off of other roofs for this customer. I have heard multiple stories of similar issues for many very experienced installers.</div>
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David Buckner</div>
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<b>From:</b> RE-wrenches <<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>> on behalf of Nick Lucchese via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><br>
<b>Sent:</b> Wednesday, November 19, 2025 12:11 PM<br>
<b>To:</b> <a href="mailto:william@millersolar.com" target="_blank">william@millersolar.com</a> <<a href="mailto:william@millersolar.com" target="_blank">william@millersolar.com</a>>; RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><br>
<b>Cc:</b> Nick Lucchese <<a href="mailto:lucchesesolar@gmail.com" target="_blank">lucchesesolar@gmail.com</a>><br>
<b>Subject:</b> Re: [RE-wrenches] Tigo TS4-A-F </div>
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CAUTION: External Email.</div>
<div style="direction:ltr">Appears that Zonna still has quite a few in stock. Feeling foolish to purchase more after having a TS4-2F fail into a pile of molten plastic and ruin a 405 watt bifacial module that I can no longer find a replacement for. What other
options do we have for small DC coupled arrays on residential rooftops though? Not the most inspiring times to be installing rooftop PV. Hopefully I'll start having better luck with the single module units. Numerous times I've had units become bricked and
not pass module voltage but this is the first time I've had this type of catastrophic failure that also inconveniently cost me the module.</div>
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<div style="direction:ltr">On Mon, Nov 17, 2025 at 7:10\u202fPM William Miller via RE-wrenches <<a id="m_-5622325128163804641OWA8c507c37-2548-2c0d-e50c-a1bd2f45ca9e" href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:</div>
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<p style="margin-top:1em;margin-bottom:1em"><span style="font-family:Verdana,"sans-serif";font-size:12pt">Friends:</span></p>
<p style="margin-top:1em;margin-bottom:1em"><span style="font-family:Verdana,"sans-serif";font-size:12pt"> </span></p>
<p style="margin-top:1em;margin-bottom:1em"><span style="font-family:Verdana,"sans-serif";font-size:12pt">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>
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<p style="margin-top:1em;margin-bottom:1em"><span style="font-family:Verdana,"sans-serif";font-size:12pt">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 style="margin-top:1em;margin-bottom:1em"><span style="font-family:Verdana,"sans-serif";font-size:12pt"> </span></p>
<p style="margin-top:1em;margin-bottom:1em"><span style="font-family:Verdana,"sans-serif";font-size:12pt">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 style="margin-top:1em;margin-bottom:1em"><span style="font-family:Verdana,"sans-serif";font-size:12pt"> </span></p>
<p style="margin-top:1em;margin-bottom:1em"><span style="font-family:Verdana,"sans-serif";font-size:12pt">All input is welcome an appreciated. Thanks in advance.</span></p>
<p style="margin-top:1em;margin-bottom:1em"><span style="font-family:Verdana,"sans-serif";font-size:12pt"> </span></p>
<p style="margin-top:1em;margin-bottom:1em"><span style="font-family:Verdana,"sans-serif";font-size:12pt">William</span></p>
<p style="margin-top:1em;margin-bottom:1em"><span style="font-family:Verdana,"sans-serif";font-size:12pt"> </span></p>
<p style="margin-top:1em;margin-bottom:1em"><span style="font-family:Arial,"sans-serif";font-size:12pt">Miller Solar</span></p>
<p style="margin-top:1em;margin-bottom:1em"><span style="font-family:Arial,"sans-serif";font-size:12pt">17395 Oak Road, Atascadero, CA 93422</span></p>
<p style="margin-top:1em;margin-bottom:1em"><span style="font-family:Arial,"sans-serif";font-size:12pt">805-438-5600</span></p>
<p style="margin-top:1em;margin-bottom:1em"><span style="font-family:Arial,"sans-serif";font-size:12pt"><a style="margin-top:0px;margin-bottom:0px" id="m_-5622325128163804641OWAc044e958-87e4-510c-7216-8bf3928995ff" href="http://www.millersolar.com/" target="_blank">www.millersolar.com</a></span></p>
<p style="margin-top:1em;margin-bottom:1em"><span style="font-family:Arial,"sans-serif";font-size:12pt">CA Lic. 773985</span></p>
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