Xantrex GT3 question [RE-wrenches]

[Mark Edmunds]

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Hi Marco,

Like with other string inverters no fusing is required on the dc side of
the GT 3.0 inverter if you are only installing 1 or 2 strings. The
maximum fault current through a short on one string cannot exceed the
short circuit current rating of a parallel connected string, so as it
says in 690.0 "the short-circuit currents from all sources do not exceed
the ampacity of the conductors". The note in the manual is mainly there
in case someone is installing 3 strings, in which case a combiner with
fusing may be required.

The GT is fully isolated, and can not backfeed to the array. In addition
under any typical fault condition it will shut down and disconnect from
the AC line.

Hope this helps!

All the best,

Mark


Mark Edmunds
Xantrex Technology Inc.

-----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]

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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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