[RE-wrenches] Enphase AC coupled through autotransformer

[William Korthof]

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.chamberlin at 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/ 

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