[RE-wrenches] Sunny Island vs. XW system - advice requested

Howie Michaelson howie at suncatchervt.com
Thu Aug 23 08:06:42 PDT 2012


We have a few GT w/Battery backup systems in the pipeline, and would also
be interested in hearing comparisons between the SI, GVFX, and Radian
systems.

We've done several off-grid SB/SI systems and like them (although as Allan
says, they are pricier), as well as innumerable off grid VFX systems, and
a few GVFX systems, but no Radians or XWs (I as a rule stay away from
Xantrex for historical reasons).  Intrigued by the Radian, but it still
feels on the bleeding edge range to be comfortable to just jump in to
them.

Thanks for any comments, on or off list.

Howie
-- 
Howie Michaelson
NABCEP Certified Solar PV Installer™

Catamount Solar, LLC
Renewable Energy Systems Sales and Service
VT Solar Electric & Hot Water Incentive Partner
http://www.CatamountSolar.com
802-272-0004


On Thu, August 23, 2012 10:39 am, Allan Sindelar wrote:
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>     Wrenches,<br>
>     We have worked with Outback Radian and Schneider XW once or twice
>     each for grid-tie with backup, and with Sunny Boy/Sunny Island
>     numerous times. The SMA is certainly the most sophisticated
>     equipment, but also the most expensive. <br>
>     <br>
>     For a particular job coming up, the loads are not excessive, and the
>     array will be 8kW. The main hitch is that the array will be located
>     on a barn roof that is about 500' from the BOS and home.<br>
>     <br>
>     I suspect that running high-voltage DC from the array to a Sunny
>     Boy, and then feeding a pair of Sunny Islands makes the most sense.
>     My question is this: does it make any sense to consider running two
>     high-voltage subarrays 500' to two Schneider XW-MPPT-80 600V charge
>     controllers, feeding two XW inverters (in order to handle the full
>     8kW) in a DC-coupled approach? <br>
>     <br>
>     Is there ever a situation in which this would be a better solution
>     than SMA?<br>
>     <br>
>     Thank you, as always,<br>
>     Allan<br>
>     <div class="moz-signature">-- <br>
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> Sindelar</b></font><br>
>       <small><a href="mailto:Allan at positiveenergysolar.com"><font
>             color="#000099" face="Times New Roman, Times,
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>         <span style="font-size: 10pt;">NABCEP Certified Photovoltaic
>           Installer<br>
>           NABCEP Certified Technical Sales Professional<br>
>           New Mexico EE98J Journeyman Electrician<br>
>           Founder and Chief Technology Officer<br>
>           <b>Positive Energy, Inc.</b><br>
>           3209 Richards Lane (note new address)<br>
>           Santa Fe, New Mexico 87507<br>
>           <b>505 424-1112</b><br>
>           <a href="http://www.positiveenergysolar.com/"
> target="_blank"><u>www.positiveenergysolar.com</u></a><o:p></o:p></span></font>
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