[RE-wrenches] Net AC kW Derate Factor for Xantrex XW inverter andXW opinions

[Maverick Brown [Maverick Solar]]

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: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] 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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