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solar cell defects? - Page 2

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Posted by Lu Wei on July 24, 2013, 7:45 am
 
On 2013-7-22 16:57, Bernhard Kuemel wrote:


17.75%, 156*156 and 195 diagonal will give 4.197W. The difference is
small but could not be mis-labeled. Maybe the package is not original.


--  
Regards,
Lu Wei
PGP key ID: 0x92CCE1EA

Posted by Kevin McMurtrie on July 21, 2013, 6:16 am
 


Those conductor breaks look harmless because there are no islands.  The  
edge colors are normal.

A problem with crappy solar cells is internal leakage.  They'll perform  
to spec in full direct sunlight but you'll get zero volts indoors or in  
the shade.  There's a lot of IR indoor near lamps and a lot of UV  
outdoors in the shade so a decent solar cell still has some use without  
direct light.  You can always do a side-by-side comparison with a known  
quality cell.
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I will not see posts from Google because I must filter them as spam

Posted by Bernhard Kuemel on July 22, 2013, 9:21 am
 On 07/21/2013 08:16 AM, Kevin McMurtrie wrote:

My cells have 0.46 V and 39 mA inside in the shade. I put them in a
stainless steel pan as backside contact and touched the middle bus bar
with a multimeter probe. My desk is next to the window, it's a bright
day outside, no direct sun hitting my window, just some diffuse reflections.

Bernhard

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