[RE-wrenches] Panels appear to be different colors

[Jay]

Thx bill

A side question, i thought most of the color had to do with AR coatings and not the actual poly silicon?

Jay

> On Nov 6, 2021, at 9:18 AM, Bill Hoffer <sunengser at gmail.com> wrote:
> 
> 
> Jay
> 
> That is possible.  Also the sorted cells are packaged in boxes that do not match the number needed per module (and there is always some breakage during soldering and layup) so it is likely that they are mixing lots at some point or during repairs of strings that get broken.  Mixing higher power cells with lower power will reduce the flash testing results and they will have to sell that module for less.  Color matching not so much a problem with flash testing but will change the operational temp of cells and maybe not be as good as performers in the field.  When I see different shades of cells I just think they are not paying attention to details in their process and I start to question where else they may be slipping up that really matters!  Again no data to prove that gut feel is correct!  Just think presentation is everything!
> 
>> On Sat, Nov 6, 2021, 7:54 AM Jay <jay.peltz at gmail.com> wrote:
>> Many OEMS outsource cells, is it possible the cells came from different cell companies?
>> 
>> Jay
>> Peltz power. 
>> 
>>>> On Nov 5, 2021, at 7:27 PM, Bill Hoffer <sunengser at gmail.com> wrote:
>>>> 
>>> 
>>> Like any manufacturing process there are variations, especially solar cells, regardless of type ( poly vs mono).  It is getting harder to the difference between poly and mono this days due to coating processes to improve efficiency. 
>>> 
>>> Cells can be sorted by output (watts) and or. Color matching.   Most module manufacturers make sure the watts are matched otherwise a module will underperform, so generally from an output point of view there are probably little difference in wattage of each cell. Ie not measurable differences noted for color variations.
>>> 
>>> That being said this is all based on flashing at room temps with no heating of the cell.  The color variation and reflectivity of the cell surface will impact the cell temperature in real life.  Is it enough to make a real performance issue, probably not.  
>>> 
>>> IMHO I have to wonder what other shortcuts a module manufacturer is taking if their cells are not color matched.  It is not hard to color match and power match cells and it usually does not cost more to do so.  The product looks more professional and should operate in the field at peak efficiency.  All the module manufacturers I work with sort by color and power output.  I am guessing the lower quality guys are not holding their suppliers to the same standard QC.  However I have no data to verify that and like I said probably not a serious hit in performance.
>>> 
>>> Bill Hoffer
>>> 
>>>> On Fri, Nov 5, 2021, 3:50 PM Jason Szumlanski <jason at floridasolardesigngroup.com> wrote:
>>>> I'm looking for a succinct way to explain why panels appear to be different colors even though they are the same orientation. See attached photo for an example. 
>>>> 
>>>> Jason Szumlanski
>>>> Florida Solar Design Group
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