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

[Solarguy]

You weren't too specific on mounting location options but does it matter
that the SI is NEMA1 rated?

 

Jim Duncan

North Texas Renewable Energy Inc

www.ntrei.com <http://www.ntrei.com/>  

NABCEP PV 031310-57

TECL-27398

ntrei at 1scom.net 

817.917.0527

 

 

 

On Aug 23, 2012, at 7:39 AM, Allan Sindelar wrote:





Wrenches,
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. 

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.

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? 

Is there ever a situation in which this would be a better solution than SMA?

Thank you, as always,
Allan

-- 
Allan Sindelar
 <mailto:Allan at positiveenergysolar.com> Allan at positiveenergysolar.com
NABCEP Certified Photovoltaic Installer
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder and Chief Technology Officer
Positive Energy, Inc.
3209 Richards Lane (note new address)
Santa Fe, New Mexico 87507
505 424-1112
www.positiveenergysolar.com <http://www.positiveenergysolar.com/> 

 

 

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