Gary, I have been looking at some AC coupled stuff lately. The "FSC" is propriatary to SMA, Sunny Island to Sunny Boy. Pretty much anything else you need something to sense the voltage of the battery bank so you can open a contactor on the AC line to the Fronius when the battery voltage gets too high. Once the voltage drops the contactor can close and bring the Fronius back on line and then the 5-minute start up delay before it is feeding the line again.
Mark Frye Berkeley Solar Electric Systems 303 Redbud Way Nevada City, CA 95959 (530) 401-8024 <http://www.berkeleysolar.com/> www.berkeleysolar.com _____ From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Gary Willett Sent: Tuesday, April 12, 2011 8:35 PM To: re-wrenches@lists.re-wrenches.org Subject: [RE-wrenches] AC Coupling Fronius IG Plus 10.0 inverter Working on a proposal to add battery backup and a generator to an existing 10kW grid-tie system using the Fronius IG Plus 10.0 inverter. Does anyone have any experience AC coupling this inverter to a Sunny Island 5048, or a Xantrex 6048? Is the Fronius capable of Frequency Shift control (FSC) that comes from the battery-connected inverter? Any other suggested solutions is appreciated. Gary Willett, PE Icarus Solar Services LLC <mailto:g...@icarussolarservices.com>
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