yes the pass thru inverter (grid tie BBOBs) has the anti islanding software, once that is off line the, the grid inverter tie inverter that were connected via the pass thru relays, after 5 mins will reconnect to your pass thru inverter that has the anti island software, and feed your AC loads. No problems w/ inspector, w/ 8 OBVGFXs coupled to SMA SB & WB inverters.. -----Original Message----- From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of design Sent: Wednesday, March 04, 2009 8:36 PM To: re-wrenches@lists.re-wrenches.org Subject: [RE-wrenches] AC Coupling, inverter listings
Fellow wrenches, I have been following the AC coupling discussions with interest, and now have a site where this would make a lot of sense. One question remains that I have not been able to answer by reading the archives I have found. Since the AC circuit from the batteryless UI inverter actually passes through the backup inverter before landing eventually in the main panel, does the backup inverter have to have the same listings required of UI inverters for interconnection(UL and IEEE)? For example, in Outback's white paper, they show the backup inverter as an off grid unit in one drawing, and grid-tie unit in another. Do both scenarios meet the code, as the generation (PV) is connected to a listed UI inverter? Have any of you run into trouble with AHJs when installing these AC coupled systems for battery back up in grid tied residences? Thanks, Jim Grundy NABCEP Certified Solar PV Installer Vermont Solar Specialist Plumber PS-279 Elemental Energy, Inc. 1750 Clark Rd E. Montpelier, VT 05651 802-476-3441 (p) 802-476-5680 (f ) 802-272-8933 (c)
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