Hi William, Please remember the GTI is not compatible with SW models manufactured prior to 2002. Rgds. _________________________________________________________________________________________
Eric Bentsen | Schneider Electric | Customer Care Center | Advanced Technical Support | Technical Support Engineer Phone: 866-519-1470 option #1 | Schneider Electric Support Center: +800-640-0770 Email: eric.bent...@schneider-electric.com | Site: www.schneider-electric.com/solar | Address: 1660 Scenic Ave. Costa Mesa, CA 92626 How am I doing? Please e-mail my manager with any feedback at: jim.hou...@schneider-electric.com *** Please consider the environment before printing this e-mail From: "William Miller" <will...@millersolar.com> To: "'RE-wrenches'" <re-wrenches@lists.re-wrenches.org>, Date: 09/09/2014 09:06 AM Subject: Re: [RE-wrenches] Grid-tied Trace SW Sent by: "RE-wrenches" <re-wrenches-boun...@lists.re-wrenches.org> Russell: I am curious, how do you perform anti-islanding tests? The SW4024 should work great with a 3.3 kW array. Due to battery and inverter inefficiencies you would never see the full 3.3 sell back any way, which is less than the rating of the inverter. The SW4024 was UL listed at one time but the listing was removed due to failure to apply the testing regimen properly, if I remember correctly. We were not required to retrofit existing installations by adding the GTI, only to add them to pending installations. Our utility lost a lot of applications during that era and years later, when forced to reapply, they accepted the SWs without GTIs. If you really want one, I have one in the shop I would sell cheap, but I don’t have much faith in the design. Lastly, I can’t comment on the efficiency of the SW versus a modern GTBB inverter. That question would justify some research. If the SW is significantly less efficient than, say, a Sunny Island, the impetus may be there to upgrade. William Miller Lic 773985 millersolar.com 805-438-5600 From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Russell Mueller Sent: Tuesday, September 09, 2014 7:43 AM To: RE-wrenches@lists.re-wrenches.org Subject: [RE-wrenches] Grid-tied Trace SW 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 r...@buffalosolartaos.com ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. ______________________________________________________________________ _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
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