<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /></head><body style='font-size: 10pt; font-family: Verdana,Geneva,sans-serif'>
<p><span style="font-size: 11pt;">Hi William,</span></p>
<p><span style="font-size: 11pt;">That looks excellent. I recently purchased a 3rd party interlock for an Eaton / Cutler Hammer box, and it does not work securely. Both breakers could be switched on at the same time due to the looseness of the fit. </span></p>
<p><span style="font-size: 11pt;">I would like to try one of yours, and be happy to pay you for it.</span></p>
<p><span style="font-size: 11pt;">Thank you,</span></p>
<p><span style="font-size: 11pt;">Drake </span></p>
<p><br /></p>
<p><em>Drake Chamberlin</em></p>
<p><em>Athens Electric LLC</em></p>
<p><em>Ohio Electrical Contractor’s License 44810</em></p>
<p><em>NABCEP Certified PV Installation Professional</em></p>
<div id="signature">---<br />
<div class="pre" style="margin: 0; padding: 0; font-family: monospace"> </div>
</div>
<p><br /></p>
<p id="reply-intro">On 2025-10-14 01:40, William Miller via RE-wrenches wrote:</p>
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0">
<div id="replybody1">
<style type="text/css">@font-face
{ font-family: Calibri; }
@font-face
{ font-family: Verdana; }
#replybody1 p.v1MsoNormal, #replybody1 li.v1MsoNormal, #replybody1 div.v1MsoNormal
{ margin: 0in; margin-bottom: .0001pt; font-size: 11.0pt; font-family: "Calibri","sans-serif"; }
#replybody1 a:link, #replybody1 span.v1MsoHyperlink
{ mso-style-priority: 99; color: blue; text-decoration: underline; }
#replybody1 a:visited, #replybody1 span.v1MsoHyperlinkFollowed
{ mso-style-priority: 99; color: purple; text-decoration: underline; }
#replybody1 span.v1EmailStyle17
{ mso-style-type: personal-compose; font-family: "Verdana","sans-serif"; color: windowtext; }
#replybody1 .v1MsoChpDefault
{ mso-style-type: export-only; font-family: "Calibri","sans-serif"; }
@page WordSection1
{ size: 8.5in 11.0in; margin: 1.0in 1.0in 1.0in 1.0in; }
#replybody1 div.v1WordSection1
{ }</style>
<div lang="EN-US">
<div class="v1WordSection1">
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">Friends:</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">For many years I had committed to the Outback product line. The decline of Outback forced me to branch out. </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">I just completed my first install of Fortress Envy inverters. Not long ago I installed a Sol-Ark 12K in my shop. Both experiences were mostly positive.</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">What is interesting is the Envy and Soul-ark inverters do not come with BOS equipment. </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">Now, if you want a PV disconnect, you need to add one manufactured by a third party. This can be accomplished with a 600 volt safety switch.</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">If you want AC disconnecting means or distribution, you need to provide outboard equipment. This is easily provided with off-the-shelf circuit breaker panels. </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">Since my second Radian install I have avoided putting AC breakers in the GSLC because wiring them was beyond tedious. Instead I ran my AC leads right through the GSLC and straight to one of two breaker panels: A generator-fed panel and in inverter-fed panel. Therefore I am not inconvenienced by lack of AC BOS with the new generation inverters.</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">There is one other function that is missing with the lack of BOS cabinets: Bypass switching. I think it is imperative that bypass capabilities be provided. Inverters can fail and occasionally need service and a bypass makes these scenarios much easier to handle. As a matter of policy I will not support a batter-inverter client if they do not have a bypass.</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">The Fortress and Sol-Ark manuals recommend use of an outboard double throw switch for bypass. These are expensive and bulky.</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">Over the years I have developed circuit breaker interlocks that can be fitted in a standard breaker panel and take care of the bypassing function cheaply and efficiently. </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">For a long time I have been meaning to write an article on the subject of transfer switches and bypass options. I finally got around to it and it can be found <a href="https://millersolar.com/MillerSolar/practices/Technical_Procedures/Interlock/Interlock.html" target="_blank" rel="noopener noreferrer">here</a>. I hope my efforts writing this might provide some insight on the subject.</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">I think I have fine-tuned my interlock design to a final iteration, as described in the article. If any of you are interested in trying out my Universal Bypass Interlock I am willing to send one for you to try at no cost. Contact me off list if you are interested.</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">Sincerely,</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';">William Miller</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Verdana','sans-serif';"> </span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Arial','sans-serif';">Miller Solar</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Arial','sans-serif';">17395 Oak Road, Atascadero, CA 93422</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Arial','sans-serif';">805-438-5600</span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Arial','sans-serif';"><a href="http://www.millersolar.com/" target="_blank" rel="noopener noreferrer">www.millersolar.com</a></span></p>
<p class="v1MsoNormal"><span style="font-size: 12.0pt; font-family: 'Arial','sans-serif';">CA Lic. 773985</span></p>
<p class="v1MsoNormal"> </p>
<p class="v1MsoNormal"> </p>
</div>
</div>
</div>
<br />
<div class="pre" style="margin: 0; padding: 0; font-family: monospace">_______________________________________________<br />List sponsored by Redwood Alliance<br /><br />Pay optional member dues here: <a href="http://re-wrenches.org" target="_blank" rel="noopener noreferrer">http://re-wrenches.org</a><br /><br />List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br /><br />Change listserver email address & settings:<br /><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank" rel="noopener noreferrer">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br /><br />There are two list archives for searching. When one doesn't work, try the other:<br /><a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" target="_blank" rel="noopener noreferrer">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br /><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" target="_blank" rel="noopener noreferrer">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br /><br />List rules & etiquette:<br /><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank" rel="noopener noreferrer">http://www.re-wrenches.org/etiquette.htm</a><br /><br />Check out or update participant bios:<br /><a href="http://www.members.re-wrenches.org" target="_blank" rel="noopener noreferrer">http://www.members.re-wrenches.org</a><br /><br /></div>
</blockquote>
</body></html>