I have a couple of questions for those who have already done an Enphase installation. We are anticipating putting a system in a major remodel. So the client has asked us to penetrate the roof with our PV wiring (we do this a lot) and run the wiring through attic space and then to the exterior wall where the meter/disco/main-panel reside. Again we do a fair amount of installs like this using metal flex or metal clad cable and protection plates.
Q1: What kind of a 2-pole, 240 VAC disco can we use before penetrating the roof? The Enphase web video shows something in a single gang Hubble box. Q2: For more than one string, how and where are folks doing AC circuit combining? - Peter Peter T. Parrish, Ph.D., President California Solar Engineering, Inc. 820 Cynthia Ave., Los Angeles, CA 90065 Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 CA Lic. 854779, NABCEP Cert. 031806-26 peter.parr...@calsolareng.com _____ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Kelly Keilwitz, Whidbey Sun & Wind Sent: Friday, February 06, 2009 11:48 PM To: RE Wrenches listserve Subject: Re: [RE-wrenches] Enphase Micro Inverter Energy System Hi Max, We've done one, have one in the shop ready to go, and another on contract. Great solution for future expansion and clean installation. All mods are in parallel, but installation (with adapter cord) is end to end. No main inverter, no DC disconnect, no service or "grouped" AC disconnect required. It's just one (or more) branch circuit to a 15A DP breaker. We've estimated that for systems <2.5 kW it's more cost effective, than using a string inverter. That's with no shading. If you have partial shading or different orientations the cost-effectiveness improves dramatically for larger systems. Our inspectors want a partial-cover array inspection (to check inverter listing and mounting), which is a bit of a hassle to arrange. Hopefully that will ease up once they see a few installs. Enphase gets the customer with the web-based, subscription, system monitoring. For small systems the production will barely cover the base cost + annual fee (free for the first year). -Kelly Kelly Keilwitz, P.E. Whidbey Sun & Wind, LLC Renewable Energy Systems NABCEP Certified PV Installer 987 Wanamaker Rd, Coupeville, WA 98239 PH & FAX 360-678-7131 sunw...@whidbeysunwind.com On 2/6/09 5:37 PM, "Max Balchowsky" <m...@seesolar.com> wrote: I've been asked to evaluate a set of plans that came accross the counter of a local municipality recently. It was the microinverter system by Enphase. I've seen this product, but this is the first actual installation I'm exposed to. Has anyone installed these? Max Balchowsky SEE Systems
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