<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Hi Jerry</div><div dir="ltr"><br></div><div dir="ltr">I\u2019m not sure I understand. </div><div dir="ltr">Are you saying that the white paper overrules ( if that\u2019s the correct way to say it) the UL and OEM guidelines?</div><div dir="ltr"><br></div><div dir="ltr">Jay</div><div dir="ltr"><br></div><div dir="ltr"><br>On Sep 5, 2019, at 8:25 AM, 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">Brian<div dir="auto">Missing the point, yes they are compatible but as we have seen in the real world there are issues. This can give module and micro inverter manufacturers an out regarding failures and responsibility </div><div dir="auto">Jerry</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Sep 5, 2019, 1:41 AM Brian Mehalic <<a href="mailto:brian@solarenergy.org" rel="noreferrer noreferrer" target="_blank">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="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="m_-318506501290202540m_1919283445577569262m_-4519548902895815155AppleMailSignature" dir="ltr">Brian</div><div dir="ltr"><br>On Sep 4, 2019, at 2:06 PM, Jerry Shafer <<a href="mailto:jerrysgarage01@gmail.com" rel="noreferrer noreferrer noreferrer" target="_blank">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" rel="noreferrer noreferrer noreferrer noreferrer" target="_blank">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_-318506501290202540m_1919283445577569262m_-4519548902895815155m_-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 noreferrer 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 noreferrer 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 noreferrer 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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