Xantrex GT3 question [RE-wrenches]

[Doug Pratt]

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Marco, in northern CA they're going in without the less-than-lovely Square D
HU361RB disconnect we've all learned to tolerate. Very clean and tidy. The
disconnect on the bottom of the GT 3.0 allows AC and DC power to be shut
off, and the inverter above it can be removed without leaving any hot
connections or wires exposed. This finally seems to be an incorporated
disconnect that makes everyone happy. But I imagine that Xantrex was just
doing CYA in case your friendly local inspector decides that the HU361RB is
the way it's always been done, and by god...
Cheers,
Doug Pratt

-----Original Message-----
From: Marco Mangelsdorf [mailto:marco at pvthawaii.com] 
Sent: Wednesday, March 23, 2005 4:45 PM
To: RE-wrenches at topica.com
Subject: Xantrex GT3 question [RE-wrenches]


To my esteemed Xantrex rep and all of you who have installed the their GT3,

Is it required, that is, are you all installing an overcurrent protection
device (fuse or breaker) between the one or two series strings feeding into
the inverter?  In drawing after drawing in the installation manual, it shows
nothing between the array and the inverter, fuse, breaker, disco or
otherwise.  And yet on page 3-6, one finds: "Important: Depending upon
installation and local codes, fusing and/or a combiner box may be required."
Again, assuming no more than two series strings, can one get by without a
fuse/breaker?  Which begs the fundamental question: can this inverter
backfeed into the DC side?

Marco Mangelsdorf
President
ProVision Technologies, Inc.
69 Railroad Avenue, Suite A-7
Hilo, Hawaii 96720 USA
(808) 969-3281, fax 934-7462
www.provisiontechnologies.com

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