DC-GFP/2 protection [RE-wrenches]

[John Mottl]

Hi Drake,
There is another issue. Some of the Array style GFPs that many manufacturers
are considering building are switch only on the array poles. They are rated
for 60 or 100 amps max as a switch but may not have a trip coil in them. If
you are considering (risking) eliminating an array disconnect you should
verify that the array GFP you are using does in fact function as a breaker
and not just a switch.
JM

-----Original Message-----
From: jberdner at sma-america.com [mailto:jberdner at sma-america.com]
Sent: Thursday, August 22, 2002 8:06 AM
To: RE-wrenches at topica.com
Subject: RE: DC-GFP/2 protection [RE-wrenches]


Drake,

Yes, if you use the GFDI breaker as a disconnect then the system becomes
ungrounded when you disconnect the PV.  Here in the US, many of the code
guru's are convinced that the sky will fall, the earth will open up, and
plagues will destroy the country if a PV system ever becomes ungrounded.
Given the very serious repercussions of ungrounding the PV system, I
think you can see why the extra cost for the redundant breaker is
justified.

The rest of the world is wrong on this one.  Here in the US we know
better.

If you have any questions, or if I can be of any further assistance,
please do not hesitate to contact me.

Best Regards,

John Berdner

SMA America, Inc.
20830 Red Dog Road
Grass Valley, CA  95945
530.273.4595 (voice)
530.274.7271 (fax)


-----Original Message-----
From: Electrical Energy [mailto:solar at eagle-access.net]
Sent: Wednesday, August 21, 2002 4:18 PM
To: RE-wrenches at topica.com
Subject: DC-GFP/2 protection [RE-wrenches]

Hello Wrenches,

The instructions for the Outback DC - GFP/2 (ground fault protection
device) require circuit breakers on either side of the unit.  There is a

breaker to disconnect the array from the GFP/2, and another to isolate
the
charge controller from the batteries.

I have heard that the DC - GFP/2 is a 60 A breaker besides being ground
fault protection.   Is there any Code, Listing or technical reason why
we
can't use the GFP/2 for the array disconnect switch, eliminating one
breaker?

Thanks,

Drake

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