Xantrex GT3 question [RE-wrenches]

[Marco Mangelsdorf]

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Mark,

Thanks for your input.  Is there an accepted protocol now for testing
inverter backfeed-to-the-array potential?  Otherwise, how would you
definitively know that the inverter cannot backfeed to the array?  I'm not
trying to be a pain here.  It's just that I've heard this from a number of
inverter manufacturers without knowing exactly how they've come to this
determination.  And what about your PV series 3-phase inverters?  Is there a
backfeed potential to the DC side with those units?

thanks,
marco
ProVision Technologies



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.





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