Kent, I don’t see an answer to Brian’s question about the LG module’s original connector configuration. We’re these modules actually factory shipped with one H4 and one MC4 connector on different polarities? That would be bizarre.
Otherwise to back up Brian’s point about Intermatability, this is a UL 6703 term that was added in NEC2020 to specifically address this question, how can installers have confidence when they are asked to connect two different manufacturer’s mating connectors. Bottom line is don’t connect “mismatched” connectors, ever. Only connect different manufacturers, and/or different models of mating connectors if at least one of the companies produces proof of evaluation of that combination by an NRTL. Warning that this is rare at this point (those wouldn’t therefore be “mismatched”). This is a very important issue so my advice to Wrenches is to keep firm and don’t budge on this one. Also curious if you all still think you can’t cut off module connectors? We need to correct that if so. Jason Fisher ________________________________ From: RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> on behalf of Jerry Shafer <jerrysgarag...@gmail.com> Sent: Thursday, September 5, 2019 11:25 AM To: RE-wrenches Subject: Re: [RE-wrenches] connector mismatch Brian 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 Jerry On Thu, Sep 5, 2019, 1:41 AM Brian Mehalic <br...@solarenergy.org<mailto:br...@solarenergy.org>> wrote: I don’t think “some white paper” is sufficient based on Code requirements, UL standards (6703), and verified field failures. Also see 2020 NEC® 690.33(C) - now requiring intermatability. Brian On Sep 4, 2019, at 2:06 PM, Jerry Shafer <jerrysgarag...@gmail.com<mailto:jerrysgarag...@gmail.com>> wrote: Wrenches 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. Jerry On Wed, Sep 4, 2019, 1:42 PM Brian Mehalic <br...@solarenergy.org<mailto:br...@solarenergy.org>> wrote: Are you saying each module has, for example, a positive factory H4 lead and a negative factory MC4 lead? I definitely know of H4 problems, both mated with H4s and mismatched. Brian Mehalic NABCEP Certified Solar PV Installation Professional™ R031508-59 National Electrical Code® CMP-4 Member (520) 204-6639 Solar Energy International http://www.solarenergy.org SEI Professional Services http://www.seisolarpros.com On Wed, Sep 4, 2019 at 1:22 PM Kent Osterberg <k...@coveoregon.com<mailto:k...@coveoregon.com>> wrote: I've recently been looking for the cause of random power drop offs to zero in an Enphase M215 system with LG260 PV module that was installed in 2013. Just one inverter in a system of fourteen has been doing this. Enphase suggested moving the inverter to a different PV module and sure enough doing that proved the problem wasn't with the inverter. Intermittent zero output was being caused by the PV module. In making the inverter/module change I found that all the LG 260 modules in this system have one MC4 connector and one H4 connector. At present I'm convinced the mismatched connector is the actual cause of the problem. Anyone else ever notice find PV modules with mixed MC4 and H4 connectors? Kent Osterberg Blue Mountain Solar _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org<mailto:RE-wrenches@lists.re-wrenches.org> Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm<http://www.re-wrenches.org/etiquette.htm> Check out or update participant bios: www.members.re-wrenches.org<http://www.members.re-wrenches.org> _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org<mailto:RE-wrenches@lists.re-wrenches.org> Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm<http://www.re-wrenches.org/etiquette.htm> Check out or update participant bios: www.members.re-wrenches.org<http://www.members.re-wrenches.org> _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org<mailto:RE-wrenches@lists.re-wrenches.org> Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm<http://www.re-wrenches.org/etiquette.htm> Check out or update participant bios: www.members.re-wrenches.org<http://www.members.re-wrenches.org> _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org<mailto:RE-wrenches@lists.re-wrenches.org> Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm<http://www.re-wrenches.org/etiquette.htm> Check out or update participant bios: www.members.re-wrenches.org<http://www.members.re-wrenches.org>
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