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 <suneng...@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.pe...@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 <suneng...@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 >>>> <ja...@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 >>>> _______________________________________________ >>>> List sponsored by Redwood Alliance >>>> >>>> Pay optional member dues here: http://re-wrenches.org >>>> >>>> List Address: RE-wrenches@lists.re-wrenches.org >>>> >>>> Change listserver email address & settings: >>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>> >>>> There are two list archives for searching. When one doesn't work, try the >>>> other: >>>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >>>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>>> >>>> List rules & etiquette: >>>> http://www.re-wrenches.org/etiquette.htm >>>> >>>> Check out or update participant bios: >>>> http://www.members.re-wrenches.org >>>> >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> Pay optional member dues here: http://re-wrenches.org >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> There are two list archives for searching. When one doesn't work, try the >>> other: >>> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >>> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >>> >>> List rules & etiquette: >>> http://www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> http://www.members.re-wrenches.org >>> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org >
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