User talk:Rfassbind

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-- Wikimedia Commons Welcome (talk) 21:29, 19 April 2014 (UTC)

File:Polysilicon compilation.jpg[edit]

Hallo Rfassbind, ergänzt du hier noch die Autoren- und Quellen-Angabe aller Bilder in dieser Kollage. --Túrelio (talk) 14:22, 25 October 2014 (UTC)

Wow that was quick, I just uploaded it. Of course I'll source the information, as I always do to the best of my knowledge. Thanks for checking and keep up the good work supervising uploads. Cheers, -- Rfassbind (talk) 14:33, 25 October 2014 (UTC)
Von den 2 benutzten Bildern, die ich bislang gefunden habe, ist aber keines PD. Deshalb darfst du diese Kollage auch nicht als PD erklären. Der geeignete Baustein für solche Werke ist {{Derived from|Example.jpg|Beispiel.png}}. --Túrelio (talk) 14:36, 25 October 2014 (UTC)
Thanks for the info. I usually amend files right after uploading, since that a bit easier to do. It normally takes just a minute or two, unless I get messages und my edits aren't saved due to edit-conflicts. I feel kind of stressed now. -- Rfassbind (talk) 14:48, 25 October 2014 (UTC)
No idea why you are talking to me in english. Anyway, you still need add the correct license tag, as your initial one was plain invalid. --Túrelio (talk) 14:53, 25 October 2014 (UTC)
Infelizmente, solo tengo doz manos y diez dedos. Si no tengas la paciencia y me escribas mesages todo el tiempo, no puedo continuar hace lo que intiendo. Saludos y calmate un poquito. -- Rfassbind (talk) 14:58, 25 October 2014 (UTC)

File:Silicon purification processes.svg[edit]

Welche Quellen wurden dann bei diesem Schema benutzt? "Various" ist etwas ungenau. --Túrelio (talk) 14:34, 25 October 2014 (UTC)

Thanks, I know. I do source all my uploads with as much detailed information as I can. Sometimes it takes a day or so to gather the best info available. Cheers, -- Rfassbind (talk) 14:53, 25 October 2014 (UTC)
Well, that might o.k. if you are contributing to a Wikipedia article. However, when publishing images/graphics/works which are not completely your own work, as with the silicon collage above, a delay of more than a few minutes is not acceptable, as the upload/publishing under a specific license is a legal act. Per copyright law, authors have a right to be mentioned for their works. Also, I don't really understand the need for a delay of more than a few minutes. If you create a collage/compilation, you need to gather all the parts anyway before you can upload it. So, why don't you copy an empty description template to your word processor, enter all the required information and during upload just paste it into the description window. At least, that's the way I do. --Túrelio (talk) 15:05, 25 October 2014 (UTC)
Sure, understood. Thanks for your appreciation and I hope you'll understand that I won't go into a conversation with you right now, since that the main reason why I am delayed in the fist place. Bye now -- Rfassbind (talk) 15:14, 25 October 2014 (UTC)


I've noticed a couple of errors in this and related files (such as the learning curve on the Swanson's Law Wikipedia page) pertaining to the values you use for 2014 and 2015. The big one is that you seem to be using the cell price from EnergyTrend, and not the module price -- the historical data you retrieved from Bloomberg uses module price, as do pretty much all historical price data sets I'm aware of. Thus, you have a mismatch in your data that make prices appear much lower than they really are and make it appear as though there have been tremendous price reductions the past couple of years (there haven't -- in fact, they've been rather steady for the past 18 months or so).

On a related note, the Bloomberg data represent annual averages, not just a single data point picked out on a particular day, and Bloomberg's price survey methodology is different from EnergyTrend's. Thus, by taking a single day's data from a different source you risk introducing additional error (and you are arguably posting original research). You can obtain professionally assembled learning curve data from multiple sources, including the ITRPV Roadmap, EPIA, SEIA, etc. Typically the ITRPV Roadmap is amongst the first to update with the previous year's data.--Squirmymcphee (talk) 08:43, 19 May 2015 (UTC)

Thx for your feedback. The chart File:Price history of silicon PV cells since 1977.svg is based on a secondary source using this image and it explicitly says "..price of crystalline silicon photovoltaic cells $/watt" and does not refer to module prices. Could you please provide the underlying Bloomberg data that shows that the author Geoffrey Carr: science editor, The Economist (or whoever prepared the graph on the website) has confused module with cell prices? That would be great. Also when mentioning alternative sources, please give me the name of the report, the URL to the document, and the page number where the data is given, in the same way as I have done for the chart you're scrutinizing. However, just to avoid any misunderstanding, I've never produced a log-log learning-curve chart that plots prices vs. cumulative PV production, so there is no point in providing me data for such. Cheers -- Rfassbind (talk) 11:46, 19 May 2015 (UTC)
No but I have. :) This is the data that I used. I would be happy to change it if better data is available. But a log-log plot is so granular that 10% errors do not really even show up. It shows orders of magnitude of change, not small percentages. I think it is a good point though that it could be module prices, as that would explain why 2014 and 2015 are so far off of the curve, and would put them instead at around $0.59 and $0.53. Delphi234 (talk) 04:19, 23 May 2015 (UTC)

On the left is the data that was previously used. It was replaced with the data on the right, from ITRPV. There are three more data points than years, so I am not quite sure how to assign dates to the data. I have an older chart, from 1976 to 2009, done by Ken Zweibel, GWU, for module prices and shipments, with dates, and can try to correlate them. Delphi234 (talk) 02:51, 24 May 2015 (UTC)

Year Cell cost Cumulative installation
1992 $7.57 105
1993 $7.08 130
1994 $7.05 158
1995 $6.30 192
1996 $5.71 237
1997 $6.04 305
1998 $6.35 386
1999 $6.30 510
2000 $5.36 1,425
2001 $5.08 1,753
2002 $5.28 2,220
2003 $4.75 2,820
2004 $4.24 3,952
2005 $3.57 5,364
2006 $3.86 6,946
2007 $3.78 9,521
2008 $3.86 16,229
2009 $1.98 23,605
2010 $1.76 40,670
2011 $1.16 71,061
2012 $0.84 102,156
2013 $0.74 138,900
2014 $0.36 180,000
2015 $0.30 234,000
2011 $/watt
module cost
Cumulative shipments (MWp)
$99.00 0.42
$74.00 0.86
$52.00 1.8
$44.00 3.3
$33.00 6.5
$25.00 12
$21.00 20
$17.50 42
$15.20 67
$13.60 89
$10.30 115
$7.90 145
$7.10 177
$7.70 220
$8.20 260
$7.50 320
$6.80 380
$6.60 440
$6.10 510
$5.50 580
$5.70 670
$5.80 800
$5.50 950
$4.70 1,150
$4.60 1,440
$4.50 1,820
$3.80 2,400
$3.70 3,100
$3.90 4,300
$4.00 6,000
$4.20 8,500
$3.90 12,300
$3.30 19,100
$2.30 30,000
$1.50 54,000
$1.30 65,000
$1.20 71,000
$0.95 77,000
$0.83 92,000
$0.69 110,000
$0.72 144,000
$0.62 184,000