Grid Tie on GFCI [RE-wrenches]

[Matt Lafferty]

Fellow Wrenches (Including Inverter Manufacturers!!!),

PV in the Post Katrina world is getting more and more interesting every day.
Coming to a flood zone near you!!!!   All GFI's. All the time!

Does anybody have any experience with non-backup interconnections on GFCI
protected AC circuits?  First time for me.  I'm on the record with a "thumbs
down" to the project for numerous reasons, most of which I won't bother
outlining here. I figure that I'd rather take long strange trips of other
varieties.. I'm surely not interested in being stuck in Da-vis again!  It's
not far enough from Lodi to make me feel better. Unfortunately, I'm not the
only one voting. 

This is a 120/240, single phase interconnection that will be required to
have GFCI protection due to its location in a 100 year flood plane.  The
proposed system will include 2 each Xantrex GT-3.0 in case that matters.  My
primary concern is nuisance tripping of the GFCI.  (Whether or not the PV
has anything to do with it).  My instinct tells me that pushing power in an
otherwise unnatural direction will confuse the danged tripper thing. Which
will, in turn, cause the ***LAWYER CUSTOMER*** to call.. Which will. Oh, you
get the idea.

Any experience with this?  Good?  Bad?  Ugly?

Thanks in advance for any words of wisdom!

Matt Lafferty
mlafferty at universalenergies.com



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