Be sure to read Enphase's tech sheet on center tap of branch circuits.
Holt E. Kelly Holtek Fireplace & Solar Products 500 Jewell Dr. Waco, TX 76712 <http://www.holteksolar.com/> www.holteksolar.com 254-751-9111 From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Nathan Stumpff Sent: Thursday, October 03, 2013 2:28 PM To: RE-wrenches Subject: Re: [RE-wrenches] Enphase commercial Hi Eric, It is 25 inverters on a 20A circuit, but only on 208 three phase. Each micro connects to the cable in an alternating way (L1/L2, then L2/L3, then L3/L1, etc.) so with 25 micros there are either 8 or 9 micros on each combination. 9 x 1.0 A x 1.732 (square root of 3) x 1.25 = 19.48 A = 20 A breaker Cheers, -Nathan -- Nathan J. Stumpff NABCEP Certified PV Installation Professional #091209-175 NABCEP Certified Solar Heating Installer #032412-14 Project Manager | Arctic Sun, LLC nat...@arcticsun-llc.com <mailto:nat...@arcticsun-llc.com> | (907) 457-1297 www.reina-llc.com <http://www.reina-llc.com/> | www.arcticsun-llc.com <http://www.arcticsun-llc.com/> <http://www.facebook.com/ArcticSunLLC> From: re-wrenches-boun...@lists.re-wrenches.org <mailto:re-wrenches-boun...@lists.re-wrenches.org> [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of SunHarvest Sent: Thursday, October 03, 2013 10:52 AM To: RE-wrenches Subject: [RE-wrenches] Enphase commercial Hey Wrenches & Nick Soleil (with whom I worked at APS for a time I believe...), I'm not familiar with Enphase commercial applications and am currently working through a commercial design. Enphase, on their M215 datasheets claim up to 25 micros per branch, at 1.0A each, with each branch terminating at a 20A breaker. By my calculations, 25 micros at 1.0A each (25A*1.25=31.25A) need to terminate at a 40A breaker. Anyone know what I'm missing or know how the 20A breaker design gets past the AHJ? Eric Stikes SunHarvest (530) 798-3738
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