August,
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. Next visit is up on the roof (steep pitch) to see if there is anything obvious. I hate to simply disable the AFCI functionality without a serious effort, however I am approaching that point. 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. Looking forward to hearing more of your experience as it develops! -Glenn From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of August Goers Sent: Friday, July 22, 2016 10:23 AM To: RE-wrenches Subject: Re: [RE-wrenches] Replacing grounded inverters Glen, 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. August From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Glenn Burt Sent: Friday, July 22, 2016 5:08 AM To: RE-wrenches Subject: Re: [RE-wrenches] Replacing grounded inverters 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. It made me feel better about doing recent replacements. I'm having more trouble with the TL inverters and AFCI issues on older systems, however. _____ From: Gary at Santa Ynez Valley Solar <mailto:g...@syvsolar.com> Sent: 7/21/2016 21:43 To: re-wrenches@lists.re-wrenches.org Subject: [RE-wrenches] Replacing grounded inverters 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. Gary Gary Gordon cid:image001.jpg@01D06621.23813A90 <http://www.syvsolar.com/> www.SYVSolar.com PO Box 688 Santa Ynez, CA 93460 805 688-1213 NABCEP Certified Installer CA Licensed Solar Contractor
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