[RE-wrenches] Grid-tied Trace SW

Tue Sep 9 07:59:19 PDT 2014

Hi Russell,
The Trace SW4024 can sell it's full 4kW rating without any problem. The 
GTI was developed to add an extra layer 
of anti-islanding protection in 2002. The units that were previously 
approved for grid interconnection were allowed 
to be "grandfathered in" for the most part, and continue to sell back. 
This would be up to AHJ.
Rgds,
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From:
Russell Mueller <russ at buffalosolartaos.com>
To:
RE-wrenches at lists.re-wrenches.org, 
Date:
09/09/2014 07:43 AM
Subject:
[RE-wrenches] Grid-tied Trace SW
Sent by:
"RE-wrenches" <re-wrenches-bounces at lists.re-wrenches.org>

Hello Esteemed Wrenches,

I have a prospective client who has an old GTBB system using a Trace SW -- 
it was permitted and signed off by the utility way back when and has been 
operational ever since.  It's a Trace SW 4024 that's feeding the grid 
through a Trace T-240 transformer -- I didn't see a GTI.  All he wants me 
to do is replace his failing array (which would increase his array size 
from 1152W to 3300W) -- not pull a permit, not change the BOS other than 
to add a 2nd charge controller.

The original question that lead me to write this post is whether the 
SW4024 can handle the full 4kW sell-back onto the grid -- I couldn't find 
any specs on that on the web. 

But the question I have now is whether the Trace SW is UL1741 compliant. I 
didn't think to do an anti-islanding test before I left the site.  If it's 
not, then I'm thinking maybe I should insist that he change out his 
inverter for a modern one, or I'll pass on the job.  If it fails an 
anti-islanding test (which I'll do next time I'm in his neighborhood), 
then the dangers are obvious, and I don't want the liability.

What would you all do in this situation?  Do any of you have experience 
with grid-tied SWs -- any advice?

Thanks,

Russ

--
Russell Mueller
NM EE98 Electrical Contractor, license #382671
NM ER1J Journeyman Electrician
Photovoltaic Designer / Installer

BUFFALO SOLAR LLC
Taos, New Mexico
575-770-4877
russ at buffalosolartaos.com

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