Some interesting results: ie. High altitude BIPV suffers reduced
degradation because of minimal snow loading. (I assume because of less
flexing of the substrate?)
Array degradation was often listed as twice the module degradation.
Offering a challenge to make the installation better?
I left those Ivory Towers d.b.a. failure analysis to avoid sitting at a
desk but still find a fascination in their results.
Thanks, Ray,
Bill Loesch
Solar 1 - Saint Louis Solar
314 631 1094
On 03-Jun-15 11:45 PM, Ray Walters wrote:
http://www.sciencedaily.com/releases/2014/02/140213122404.htm
http://www.nrel.gov/docs/fy12osti/51664.pdf
go to the conclusion on page 18.
Thanks,
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 6/1/2015 5:46 PM, jay peltz wrote:
HI Ray,
Can you tell me/us where you have your data on the a-Si having higher
voltage degradation over time?
thanks
jay
On Sun, May 31, 2015 at 11:31 AM, Ray Walters <r...@solarray.com
<mailto:r...@solarray.com>> wrote:
Yes, amorphous modules degrade faster then crystalline cells. 15
years will really start catching up with you, that's why we
always tried to stick to monocrystalline when we could.
I think your best option for now is to rewire the array for much
higher voltage. Even your current voltage problem aside, the
system will run more efficiently at higher voltage: Less current
= less voltage drop. I would probably just jump the 4 module
sets in series in the combiner box to 8 in series. Should be a
quick fix, and really show an improvement. I've seen this same
issue with low voltage polys and undersized wiring. Usually the
MPP controllers like some room to play with; as soon as the MPP
voltage gets close to or less than battery voltage, the current
drops off substantially.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760 <tel:303%20505-8760>
Jay Peltz
Peltz Power
jay.pe...@gmail.com <mailto:jay.pe...@gmail.com>
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