[RE-wrenches] CIS mods

[Carl Emerson]

Doug,

 

I could be wrong but I don’t think that definition of soaking is correct.

 

Typically it takes 6 months of good sunlight minimum for a module to reach a
stable output, this is particularly true of A-Si . For example a US64 will
degrade 15% and then settle at the label rating after 6 months of soaking in
good sun.

 

I attach a link to a report on this issue


 

 
http://www.physics.arizona.edu/~cronin/Solar/References/Degradation/carr%20P
V%20comparison%202004.pdf 

 

This report shows degradation across different technologies. I would stress
that real word performance is the more important factor as the report
concludes
  “The triple junction a-Si modules produce over 15% more energy
than BP275(c-Si) does in summer, and around 8% more in winter
”  Yet in the
degradation stakes it did less well.

 

Producing energy should be the first consideration. 25 degrees C and
1000W/M² almost never exists in real life yet is the industry bench mark
behind which many manufacturers have hidden poor performance. At realistic
temperatures of 50 – 60 degrees C many Poly and Mono panels only manage 60%
of their rating. Additionally, none of the industry standard measurements
allow for a panels ability to respond to light being captured at high angles
of incidence, therefore at times of global irradiance, some panels
performance drops off quite seriously.

 

Excuse the rave
 pet subject.

 

Regards
Carl Emerson

 

 

Ok so its a reading night.

There are a bunch of very good papers about this effect on all the different
types of modules.
www1.eere.energy.gov/
<http://cs.dogpile.com/ClickHandler.ashx?du=http%3a%2f%2fwww1.eere.energy.go
v%2fsolar%2fpdfs%2fpvmrw2011_p25_tf_dunn.pdf&ru=http%3a%2f%2fwww1.eere.energ
y.gov%2fsolar%2fpdfs%2fpvmrw2011_p25_tf_dunn.pdf&ld=20130219&ap=4&app=1&c=in
fo.dogpl&s=dogpile&coi=239138&cop=main-title&euip=24.147.2.48&npp=4&p=0&pp=0
&pvaid=b38b38d290ad401eb6a632df17eb8c15&sid=1830193568.2660773008126.1361238
904&vid=1830193568.2660773008126.1361138254.13&fcoi=417&fcop=topnav&fpid=2&e
p=2&mid=9&hash=60D4EDF8C76D3C8BF8BF97A0BBCF6F57>

dfs/pvmrw2011_p25_tf_dunn.pdf 

Best summary of Soaking would be :   controlled exposure to light under
controlled environmental conditions.

The "soaking" seems to come from exposing the panel to light for
--extended-- periods.

Thus finding the effects on the panel after it has reached a critical point
of light exposure.

Like a sponge, the panel has been fully soaked with light.

Then they observe effects.  Some pretty interesting effects in some panels.

Doug Wells

The Solar Specialists

Morrisville, VT 05661

(p) 802-223-7014

(c) 802-498-5856

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

 

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