I guess all this does is effectively reduce the number of inverters in each string, and create two strings from one (but without additional homerun string wiring). So you need two factory pigtails instead of one for each "original" string for the center tap j-box, but a small price to pay for increased system efficiency. Good idea.
Kirk Herander Vermont Solar Engineering 802.863.1202 NABCEP(tm) Certified Solar Installer NYSERDA-eligible Installer VT Solar Incentive Program Partner _____ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of David Brearley Sent: Friday, June 11, 2010 4:04 PM To: RE-wrenches Subject: Re: [RE-wrenches] AC wiring loss on micro-inverters Maybe Marv can help out here. I've talked with tech support at Enphase and am under the impression that you can center tap their branch circuits to reduce voltage drop. This technique was used on a project that we profiled in SolarPro: http://solarprofessional.com/article/?file=SP3_2_pg92_Projects_1 <http://solarprofessional.com/article/?file=SP3_2_pg92_Projects_1&search=> &search= David Brearley, Senior Technical Editor SolarPro magazine On 6/11/10 2:50 PM, "Nick Soleil" <nicksoleilso...@yahoo.com> wrote: Did you notice that in my calculation I divided the total amperage by 2 to get the average ampacity across the string. This seems to be the best way to deal with that. Otherwise the loss would have been over 2.8% Nick Soleil Project Manager Advanced Alternative Energy Solutions, LLC PO Box 657 Petaluma, CA 94953 Cell: 707-321-2937 Office: 707-789-9537 Fax: 707-769-9037
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