<div dir="auto">Another example of problems associated with disconnecting under load. Not recommended. That’s why RSD is so hard to achieve. <br clear="all"><div><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 Sat, Apr 19, 2025 at 7:20 AM Drake Chamberlin 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 style="font-size:10pt;font-family:Verdana,Geneva,sans-serif">
<p><span style="font-size:12pt">Those devices were susceptible to catching fire. I saw a hole burned in a roof from one of them. It is a great idea however. <br></span></p>
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<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>
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<p id="m_1140393817507888697reply-intro">On 2025-04-18 11:46, Glenn via RE-wrenches wrote:</p>
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<div>There was a company that sold a mlpe that went online with a single module in a string, that when temps were low, would bypass the module and prevent string overvoltage.</div>
<div dir="auto">I don't believe the company is in business any longer.</div>
<div dir="auto">We re powered a PV system that had been installed with them a couple years ago. Most of the devices were charred failures.</div>
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<div>On Apr 18, 2025 11:36, Travis Knipple 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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<div>Has anyone encountered a system to use something like a Zener Circuit to clamp a string input at 600Voc?</div>
<div>I've encountered many systems which, after designing for 600Voc, end up with ~300-350Vmp, which is less than ideal on a long-distance run. Since Voc should be a rare situation at the 2% temp, it seems like it would be better to clamp the voltage in those situations, and design for optimum performance in normal operation.</div>
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<div dir="ltr">Travis Knipple
<div>Senior Engineer</div>
<div>Hudson Solar Solutions LLC</div>
<div>Rhinebeck, NY 12572</div>
<div>518-539-8040 x408 | <a href="mailto:travis@hudsonsolarsolutions.com" rel="noreferrer" target="_blank">travis@hudsonsolarsolutions.com</a></div>
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