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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>August,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I am currently chasing down unexplained AFCI faults with old SX 160 modules on a metal roof and having replaced two SMA SWR-2500U’s with a SB 5000TL-US-22. So far I have been swapping input strings to see if there is a pattern, however no joy. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Next visit is up on the roof (steep pitch) to see if there is anything obvious. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I hate to simply disable the AFCI functionality without a serious effort, however I am approaching that point. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>It is a T&M job for a system installed by others back in 2004, about an hour trip 1 way and I am afraid the customer will soon believe I am stringing out the work.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Looking forward to hearing more of your experience as it develops!<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>-Glenn<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> RE-wrenches [mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>August Goers<br><b>Sent:</b> Friday, July 22, 2016 10:23 AM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] Replacing grounded inverters<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Glen,</span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>It’s interesting you mention that you’re having AFCI issues with new TL inverters and old modules. We are too. We have a particular system with BP modules where we’re trying to figure out if we have a warranty claim situation. We’ve cleaned up all the DC-side wiring and still the Sunny Boy is tripping with AFCI errors. We think it is either corroded traces in the modules or perhaps bypass diode issues in the module j-boxes. More to come.</span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'>August</span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'> </span><o:p></o:p></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> RE-wrenches [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Glenn Burt<br><b>Sent:</b> Friday, July 22, 2016 5:08 AM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] Replacing grounded inverters</span><o:p></o:p></p></div></div><p class=MsoNormal> <o:p></o:p></p><div><div><p class=MsoNormal>If you read some of the proposed changes for the 2017 NEC, it is looking life there will be no problem replacing isolated inverters with non-isolated versions. In fact the proposed wording seems to allow either USE, or PV wire to be used with non-isolated inverters explicitly going forward.<br>It made me feel better about doing recent replacements.<br>I'm having more trouble with the TL inverters and AFCI issues on older systems, however.<o:p></o:p></p></div></div><div><div class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><hr size=2 width="100%" align=center></span></div><p class=MsoNormal style='margin-bottom:12.0pt'><b>From: </b><a href="mailto:Gary@SYVSolar.com">Gary at Santa Ynez Valley Solar</a><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br></span><b>Sent: </b>7/21/2016 21:43<span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br></span><b>To: </b><a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br></span><b>Subject: </b>[RE-wrenches] Replacing grounded inverters<o:p></o:p></p></div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Gotham Book","serif";color:black'>We are all facing having to replace the old transformer based inverters when they run out. Really difficult to find replacements. Against code to replace with transformer less ones. I wonder if a DC/DC transformer could be installed just ahead of the transformer less inverter for isolation purposes? Not clear on the concept.</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Gotham Book","serif";color:black'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Gotham Book","serif";color:black'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Gotham Book","serif";color:black'>Gary</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Gotham Book","serif";color:black'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Gotham Book","serif";color:black'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Gotham Book","serif";color:black'>Gary Gordon</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:4.0pt;font-family:"Gotham Book","serif";color:black'> </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Gotham Book","serif";color:black'> <img border=0 width=115 height=39 id="Picture_x0020_1" src="cid:image001.jpg@01D1E37E.6CF62470" alt="cid:image001.jpg@01D06621.23813A90"></span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Gotham Book","serif";color:black'> </span><span style='color:black'><a href="http://www.syvsolar.com/"><span style='font-size:10.0pt;font-family:"Gotham Book","serif"'>www.SYVSolar.com</span></a></span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Gotham Book","serif";color:black'> PO Box 688 </span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Gotham Book","serif";color:black'> Santa Ynez, CA 93460</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Gotham Book","serif";color:black'> 805 688-1213</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Gotham Book","serif";color:black'> NABCEP Certified Installer</span><o:p></o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Gotham Book","serif";color:black'> CA Licensed Solar Contractor</span><o:p></o:p></p><p class=MsoNormal> <o:p></o:p></p></div></body></html>