[RE-wrenches] Net AC kW Derate Factor for SunnyBoy/Sunny Island

[Mick Abraham]

Hi, knuckle-busters~

That's interesting information in the other thread about the actual solar
throughput to grid with the Xantrex XW architecture.

May I now poll the group to learn what percentage throughput is likely if
the inverter stack is instead an AC coupled blend of SMA
SunnyBoy/SunnyIsland hardware?

Survey says...

Mick Abraham, Proprietor
www.abrahamsolar.com

Voice: 970-731-4675


On Tue, Aug 24, 2010 at 8:40 PM, Maverick Brown [Maverick Solar] <
maverick at mavericksolar.com> wrote:

>  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 ®
> 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:        http://www.mavericksolar.com
> Help:         http://www.mavericksolar.net
> Corporate: 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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