Hi Jeff, The Sunny Island 4248U has been discontinued by SMA, and replaced with the SI5048U
If you use a transfer switch between the grid and a generator on the SI input, make sure that you put in a relay that will prevent the Sunny Boy from “selling” power to the generator Brian Teitelbaum AEE Solar From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Jeff Yago Sent: Monday, May 18, 2009 6:15 AM To: RE-wrenches Subject: Re: [RE-wrenches] Sunny Island 5048 & Enphase I am sizing an on-grid with battery backup system that requires using a ground-mounted array that will be some distance from the house. I was favoring a Sunny Island with a 4 kW SunnyBoy with AC coupled to allow using a higher voltage from the array and the 4 kW Sunny Island shown in their product catalog which is perfect for this project, but all I can find is the Sunny Island 5048. Is the smaller inverter not yet available? I will also have a backup generator with transfer switch feeding this system, so are there any issues with the Sunny Island operating from both a generator and the grid depending on which is available? Thanks, Jeff Yago
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