[RE-wrenches] module hot spots

[boB at midnitesolar.com]

I have looked at several modules (not SunPower though) and I see this 
much temperature
variation between cells BUT I have not seen anything like your picture, 
with only one cell
hotter.  What I have seen is hotter and cooler cells more or less spread out
semi-randomly.  Not sure if your example is normal or not for Sun Power ?

Here is one example from my library of FLIR pix.
A thermal imaging camera sure sheds light
on many different things !
boB





On 11/21/2015 9:31 PM, Marco Mangelsdorf wrote:
>
> Hello all,
>
> I’m seeing hot spots on some of the SunPower modules we installed 
> circa 2007-2010.  (I’ve been a SunPower dealer since 2005.)
>
> Sometimes theses cells are 20-30 degrees C hotter than the surrounding 
> cells and it’s especially striking while using a Flir IR camera.  
> Check out the two images below.
>
> cid:image001.png at 01D12070.CBCC60D0cid:image002.png at 01D12070.CBCC60D0
>
> Do many of you come across hot spotted mods?  Anyone know of any 
> papers out there on hot spots and the hit on performance and reliability?
>
> Mahalo,
>
> marco
>
>
>
> ________

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