The output of a 120/240 volt auto transformer shares neutral with the input when you use to couple a 120 volt device to a 120/240 volt split phase system... there is no isolation because the neutrals are the same connection.
I've done AC coupling with auto transformer specifically between Outbacks, "late model" Xantrex inverters, SMA, and Power one inverters. /wk On Sep 18, 2014, at 2:46 PM, Drake <drake.chamber...@redwoodalliance.org> wrote: Hello Wrenches, Has anyone AC coupled an Enphase system to a 120 VAC inverter through an autotransformer? I'm wiring up a small Enphase system now to an Outback GVFX3524. I had a concern about the derived neutral possibly causing a ground reference problem for the Enphase. It seems that the derived neutral should connect to the system neutral through the Outback and create the right ground reference. Has anyone tried AC coupling Enphase to Outback (or other 120 VAC inverter) through an autotransformer? Thanks, Drake Drake Chamberlin Athens Electric LLC OH License 44810 CO License 3773 NABCEP Certified Solar PV 740-448-7328 http://athens-electric.com/ _______________________________________________ List sponsored by Redwood Alliance List Address: 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 Check out or update participant bios: www.members.re-wrenches.org
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