True, but that are doing all kinds of secret sauce doping trying to up the efficiencies too!
On Sat, Nov 6, 2021, 9:48 AM Jay <jay.pe...@gmail.com> wrote: > 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 > > _______________________________________________ > 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. 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