<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">I don\u2019t think \u201csome white paper\u201d is sufficient based on Code requirements, UL standards (6703), and verified field failures. Also see 2020 NEC® 690.33(C) - now requiring intermatability. <br><br><div id="AppleMailSignature" dir="ltr">Brian</div><div dir="ltr"><br>On Sep 4, 2019, at 2:06 PM, Jerry Shafer <<a href="mailto:jerrysgarage01@gmail.com">jerrysgarage01@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><div dir="auto">Wrenches<div dir="auto">Per some white papers connectors are interchangeable, this being said l have had arc issues as a result. FYI there are knock-offs out there to.</div><div dir="auto">Jerry</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 4, 2019, 1:42 PM Brian Mehalic <<a href="mailto:brian@solarenergy.org" target="_blank" rel="noreferrer">brian@solarenergy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Are you saying each module has, for example, a positive factory H4 lead and a negative factory MC4 lead?<div><br></div><div>I definitely know of H4 problems, both mated with H4s and mismatched. <br clear="all"><div><div dir="ltr" class="m_-9108908460359828031m_814687027348042393gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><br></div><div>Brian Mehalic <br>NABCEP Certified Solar PV Installation Professional\u2122 R031508-59</div><div>National Electrical Code® CMP-4 Member</div><div>(520) 204-6639<br><div><br></div><div><div><div>Solar Energy International<br><a href="http://www.solarenergy.org" rel="noreferrer noreferrer" target="_blank">http://www.solarenergy.org</a></div></div></div></div><div><br></div><div>SEI Professional Services</div><div><a href="http://www.seisolarpros.com" rel="noreferrer noreferrer" target="_blank"><span style="font-size:12.8px">http://www.s</span>eisolarpros.com</a><br></div><div><br></div></div></div></div></div></div></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 4, 2019 at 1:22 PM Kent Osterberg <<a href="mailto:kent@coveoregon.com" rel="noreferrer noreferrer" target="_blank">kent@coveoregon.com</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">I've recently been looking for the cause of random power drop offs to <br>
zero in an Enphase M215 system with LG260 PV module that was installed <br>
in 2013. Just one inverter in a system of fourteen has been doing this. <br>
Enphase suggested moving the inverter to a different PV module and sure <br>
enough doing that proved the problem wasn't with the inverter. <br>
Intermittent zero output was being caused by the PV module. In making <br>
the inverter/module change I found that all the LG 260 modules in this <br>
system have one MC4 connector and one H4 connector. At present I'm <br>
convinced the mismatched connector is the actual cause of the problem. <br>
Anyone else ever notice find PV modules with mixed MC4 and H4 connectors?<br>
<br>
Kent Osterberg<br>
Blue Mountain Solar<br>
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