There is a XW6048 double-stack that has 11,760W PV and gets 8200+ W Output (in our Texas heat) and creates about 60kwh per day. That 8/11-ish number is right at 70%. I am sure the early spring will be better. I also suggest that 400Ah is the minimum battery bank size required for a proper sell-re that keeps the battery full enough to prevent sulfation, but limits overvoltage issues in puffy cloud conditions. Good luck! Maverick Maverick Brown BSEET, NABCEP Certified Solar PV Installer R President & CEO Maverick Solar Enterprises, Inc. 12010 West Highway 290, Suite 230, Austin, TX 78737 Office: 512-919-4493 Fax: 512-607-6398 Cell: 512-460-9825 Store: <blocked::http://www.mavericksolar.com/> http://www.mavericksolar.com Help: <http://www.mavericksolar.net/> http://www.mavericksolar.net Corporate: <http://www.mavericksolarenterprises.com/> http://www.mavericksolarenterprises.com
_____ From: [email protected] [mailto:[email protected]] On Behalf Of Travis Creswell Sent: Tuesday, August 24, 2010 4:11 PM To: 'RE-wrenches' Subject: [RE-wrenches] Net AC kW Derate Factor for Xantrex XW inverter andXW opinions Greetings Esteemed Wrenches, What would you recommend I use for a total de-rate factor for a grid tied Xantrex XW system with 4.14 kW of Yingli 230 watt modules? Yingli's are rated +/- 3% which probably means at least -5% to be safe. Would a total of .7 be about right? Battery bank will likely be one string of L-16's or similar. I'm helping a customer calculate annual production for his rebate. At this point it's just an estimate as Arkansas wisely bases their rebate on actual production and requires a dedicated meter for the system. I'm using the Wiley Asset tool to adjust for shading and azimuth. The Asset software uses .77 as a default but that's for a battery-less system. Probably before I head too far down this road what does anyone have to say about using the XW6048 for a grid tied application? I've used a few XW's off grid and have been pleased but never grid tied one. Best, Travis Creswell Ozark Energy Services
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