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<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="reply-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>-Glenn</div>
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<div class="v1gmail_quote">On Apr 18, 2025 11:36, Travis Knipple via RE-wrenches <re-wrenches@lists.re-wrenches.org> 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">travis@hudsonsolarsolutions.com</a></div>
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<div><img src="https://ci3.googleusercontent.com/mail-sig/AIorK4wuT0Jf3z34mlt7_aUK-QOs2RIbM5kO1oBpUVNKSFuc5ADydVvuRPMkmhWoT1Bglre_AATVNHA1BkN_" width="96" height="75" /></div>
<div>PVIP# PV-111821-013612</div>
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