Xantrex GT3 question [RE-wrenches]

[Bill Brooks]

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Mark,

Is there somewhere in your documentation where you state that the inverter
is incapable of backfeed current into the array? I couldn't find it with a
quick read. From an inspector's point of view, this is a guilty until proven
innocent situation.

Bill.


-----Original Message-----
From: Mark Edmunds [mailto:mark.edmunds at xantrex.com] 
Sent: Wednesday, March 23, 2005 6:45 PM
To: RE-wrenches at topica.com
Subject: RE: Xantrex GT3 question [RE-wrenches]


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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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