Mike,
Thanks for posting the note, but I find the wording to be less than fully clear. According to this note, the "The transformer-less series of inverters named Sunny Boy TL-US-12, Sunny Boy TL-US-22 and Sunny Tripower 12/15/20/24000TL-US-10 have a neutral connection that is required at installation for instrumentation, voltage and phase detection only." There is no mention of the -41 inverter also using the neutral for reference only, even though the note is "applicable to the following inverter types" and that shows the -41 Also, the table has these green x marks but no annotation of what the green x indicates. Can you clarify, please? From: RE-wrenches <[email protected]> On Behalf Of Harry Mahon Sent: Thursday, November 14, 2019 11:02 AM To: RE-wrenches <[email protected]>; Jeff Clearwater <[email protected]> Subject: Re: [RE-wrenches] 705.95(B) and Sunny Boys - current on Neutral? Lloyd - great find! I am attaching a updated note that specifically calls out current products but has less code detail. Best regards - Mike SMA America Michael Mahon Technical Trainer, Solar Academy 6020 West Oaks Boulevard, Suite 300 Rocklin, CA 95765 U.S.A. Mobile: +1 916 918 9412 www.SMA-America.com <http://www.sma-america.com/> Solar Academy: https://solaracademy.sma.de/en.html SMA America Solar Academy webinars: https://solaracademy.sma.de/en/courses.html Choose "English" and "Online" as filters. <http://www.facebook.com/pages/SMA-America/140290312717395> <http://twitter.com/SMA_America> <http://www.smainverted.com/> <http://www.linkedin.com/company/364675> <http://www.youtube.com/playlist?list=PL840A5336CAC32332> <http://smaadvance.com/signup/> <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.sma-a merica.com%2Fhome-systems%2Fpv-solar-and-storage-solutions.html&data=02%7C01 %7CMichael.Mahon%40sma-america.com%7Cc4bcd59d55584c70681208d71b72e485%7Ca059 b96c28294d1188374cc1ff84735d%7C0%7C0%7C637008052588484449&sdata=itzAGcXAYe0x d5Zhzjuljm6dijJW%2FRGtItHrvxRkrTI%3D&reserved=0> This email and any attachments thereto may contain SMA America, LLC confidential, privileged and private material for the sole use of the intended recipient. Any review, copying, or distribution of this email (or any attachments thereto) by others is strictly prohibited. If you are not the intended recipient, please contact the sender immediately and permanently delete the original and any copies of this email and any attachments thereto. Thank you. From: RE-wrenches <[email protected] <mailto:[email protected]> > On Behalf Of Lloyd Hoffstatter Sent: Wednesday, November 13, 2019 10:38 AM To: Jeff Clearwater <[email protected] <mailto:[email protected]> >; RE-wrenches <[email protected] <mailto:[email protected]> > Subject: Re: [RE-wrenches] 705.95(B) and Sunny Boys - current on Neutral? Jeff, An oldie but attached tech note explains. May Need to upsize G / N for voltage drop depending on run. Best regards, Lloyd Lloyd Hoffstatter Sunstruck Consulting Sent from Mail <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgo.micros oft.com%2Ffwlink%2F%3FLinkId%3D550986&data=02%7C01%7Cmichael.mahon%40sma-ame rica.com%7Ca57263d3340c445bd5ce08d76860354c%7Ca059b96c28294d1188374cc1ff8473 5d%7C0%7C0%7C637092634734737930&sdata=ljnPZYRGhPwgRSsi3yM%2BI46x1iUvt52uQ8Dt Hvidzvw%3D&reserved=0> for Windows 10 _____ From: RE-wrenches <[email protected] <mailto:[email protected]> > on behalf of Jeff Clearwater <[email protected] <mailto:[email protected]> > Sent: Wednesday, November 13, 2019 12:00:37 PM To: RE-wrenches <[email protected] <mailto:[email protected]> > Subject: [RE-wrenches] 705.95(B) and Sunny Boys - current on Neutral? Hey Folks, So does anyone have a reference I can show my AJH as to whether there is any current on the neutral of a single phase 240 VAC SB 7.7-40 inverter? 705.95(B) states: Neutral Conductor for Instrumentation, Voltage Detection or Phase Detection. A conductor used solely for instrumentation, voltage detection, or phase detection and connected to a single-phase or 3-phase utility-interactive inverter, shall be permitted to be sized at less than the ampacity of the other current-carrying conductors and shall be sized equal to or larger than the equipment grounding conductor. Be great not have to run 3/0 wire to my dedicated PV subpanel with 5 SB7.7s. At 200 Amps I could use 6 AWG according to 705.95. A huge savings in wire pull hassle not to mention copper. Are there any other practical considerations for those SBs to operate well if I were to go that low with the neutral? Anybody have any field experience with AJHs on this? Thanks, Jeff ~~~~~~~~~~~ Jeff Clearwater Village Power Design linkedin <https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.linke din.com%2Fin%2Fjeff-clearwater-0622a312%2F&data=02%7C01%7Cmichael.mahon%40sm a-america.com%7Ca57263d3340c445bd5ce08d76860354c%7Ca059b96c28294d1188374cc1f f84735d%7C0%7C0%7C637092634734747920&sdata=p3O8JIapfJi4lWUaxtjir6oD0Nfss%2Fv zCc%2BmO6DhkIc%3D&reserved=0> www.villagepowerdesign.com <https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.villag epowerdesign.com&data=02%7C01%7Cmichael.mahon%40sma-america.com%7Ca57263d334 0c445bd5ce08d76860354c%7Ca059b96c28294d1188374cc1ff84735d%7C0%7C0%7C63709263 4734747920&sdata=nAk%2FP4sQtocN2rmE64IfGo5BkOo1gemXIBVpP1nWXII%3D&reserved=0 > cell - 413-559-9763 ~~~~~~~~~~~~~~~~~~~~~~~
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