triple junction vs single crystalline [RE-wrenches]

Brian Teitelbaum brian at aeesolar.com
Wed Feb 7 10:13:12 PST 2007


Keith,

One of our dealers decided to try out the Uni-Solar claim buy installing
identically sized arrays (STC) on the roof of the CO-OP store in Arcata, CA.
Arcata is in northern California, 280 miles north of SF, right on the coast
and is a very foggy area, even in the summertime. He was very hopeful that
the amorphous modules would produce more power.  

One array of US-64's and another array of Shell 130's (single crystalline),
with an SMA 2500 on each, mounted on "awning" mounts right next to each
other, and in the same plain. The Uni-Solar array is visibly twice as large
as the Shell array, and these were the older Shell 130's which are the same
size as their (Solarworld's) newer 175W modules are, so newer crystalline
modules would take up even less space. Obviously, the cost of the mounting
structures for the Uni-Solars was about double too.

Data monitoring over the past couple of years has shown greater accumulated
kWhrs from the crystalline array. He switched the inverters after the first
year to make sure that the inverters weren't a contributing factor. They
weren't.

The highest temp ever recorded there is 89F, so the benefit of amorphous SI
in hot weather was not a factor in this test. However, because of the
results of this test, he has not sold another amorphous array.

I hope this is helpful.

Brian Teitelbaum
AEE Solar




-----Original Message-----
From: Keith Cronin [mailto:kcronin at islandenergy.net] 
Sent: Tuesday, February 06, 2007 4:08 PM
To: RE-wrenches at topica.com
Subject: triple junction vs single crystalline [RE-wrenches]




Ok

 

I got the call from a client that wanted to utilize a roofing solar
integrated material and that they were told it is by far better than single
crystalline.

 

They stated it is 4 watts per sq ft vs 10 watts for single, but that
overall, in intermittent weather, and average over the coarse of the day,
triple makes more kW.

 

They also stated due to tax credits, that they can consider the roof
membrane as the "structure" aka racking, and take the tax credits on the
whole roof.

 

Any takers on this debate?

 

Thanks

 

 

Keith Cronin

President

Island Energy Solutions Inc.

270 Kuulei Rd. Suite 106

Electrical Lic C-25221

Kailua, HI 96734

808-262-3268 Tel

808-263-0338 Fax

www.islandenergy.net 

 <mailto:kcronin at islandenergy.net> kcronin at islandenergy.net

 


[Non-text portions of this message have been removed]


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