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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