Grid Tie on GFCI [RE-wrenches]

[Bill Brooks]

Matt,

You are going to have to consult the manufacturer of the GFCI device to know
the answer. Many mid-size GFP devices used in commercial building cannot be
run in reverse. Very large devices that use CTs generally can be run in
reverse without problems. I assume this is a 100 or 200-A device. You will
likely have to make your connection on the line side of the device as per
690.64. If they won't let you do that, then you can't do the system.

Bill.


-----Original Message-----
From: Matt Lafferty [mailto:mlafferty at universalenergies.com] 
Sent: Tuesday, September 05, 2006 6:19 PM
To: Wrenches List
Subject: Grid Tie on GFCI [RE-wrenches]




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



[Non-text portions of this message have been removed]


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