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 <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 [image: cid:image001.jpg@01D06621.23813A90] www.SYVSolar.com <http://www.syvsolar.com/> PO Box 688 Santa Ynez, CA 93460 805 688-1213 NABCEP Certified Installer CA Licensed Solar Contractor
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