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*And this discusses poly si vs mono si [https://blog.ucsusa.org/charlie-hoffs/how-are-solar-panels-made/#:~:text=This%20process%20uses%20a%20lot,hour%20than%20coal%2Dpowered%20electricity.] | *And this discusses poly si vs mono si [https://blog.ucsusa.org/charlie-hoffs/how-are-solar-panels-made/#:~:text=This%20process%20uses%20a%20lot,hour%20than%20coal%2Dpowered%20electricity.] | ||
*embodied energy of 165-375 kWhr/kg [https://onlinelibrary.wiley.com/doi/10.1002/solr.202200458#:~:text=Ingot%20growth%20from%201%20kg,kWh%20kg%20Si%20wafer%E2%88%921. ] | *embodied energy of 165-375 kWhr/kg [https://onlinelibrary.wiley.com/doi/10.1002/solr.202200458#:~:text=Ingot%20growth%20from%201%20kg,kWh%20kg%20Si%20wafer%E2%88%921. ] | ||
**Good news - 65% of all energy goes into the wafers, as opposed to everything else (glass + All + EVA) according to same link | |||
**Similar for amorphous silicon [https://www.google.com/search?q=what+is+the+embodied+energy+per+kilogram+of+amorphous+silicon&oq=what+is+the+embodied+energy+per+kilogram+of+amorphous+silicon&gs_lcrp=EgZjaHJvbWUyBggAEEUYOdIBCDg2MDlqMGo0qAIBsAIB&sourceid=chrome-mobile&ie=UTF-8] | **Similar for amorphous silicon [https://www.google.com/search?q=what+is+the+embodied+energy+per+kilogram+of+amorphous+silicon&oq=what+is+the+embodied+energy+per+kilogram+of+amorphous+silicon&gs_lcrp=EgZjaHJvbWUyBggAEEUYOdIBCDg2MDlqMGo0qAIBsAIB&sourceid=chrome-mobile&ie=UTF-8] | ||
*Compare to steel at 20 MJ/kg [https://www.google.com/search?q=what+is+the+embodied+energy+of+steel&sca_esv=9360e7f17122653e&sxsrf=ADLYWILnZrV0U_M4TyJlSYlQDrEA_SXC-g%3A1733191918085&ei=7mhOZ7jfBKOYptQPs_3d0AQ&oq=what+is+the+embodied+energy+of+steel&gs_lp=EhNtb2JpbGUtZ3dzLXdpei1zZXJwGgIYAiIkd2hhdCBpcyB0aGUgZW1ib2RpZWQgZW5lcmd5IG9mIHN0ZWVsMgUQABiABDIFECEYoAEyBRAhGKABMgUQIRigATIFECEYoAEyBhAAGBYYHjILEAAYgAQYhgMYigUyCBAAGIAEGKIESMVQULMVWN9NcAJ4AZABApgBwQGgAdwbqgEEMjcuObgBA8gBAPgBAZgCDaAC_AeoAg_CAgoQABiwAxjWBBhHwgIHECMYJxjqAsICChAjGCcY6gIYiwPCAg8QIxiABBgnGIoFGEYY-QHCAgQQIxgnwgILEAAYgAQYkQIYigXCAgoQABiABBhDGIoFwgIREC4YgAQYsQMY0QMYgwEYxwHCAgoQABiABBgUGIcCwgILEAAYgAQYsQMYgwHCAggQABiABBixA8ICDhAAGIAEGLEDGIMBGIoFmAMRiAYBkAYIkgcEMTEuMqAH-Y8C&sclient=mobile-gws-wiz-serp], and 200MJ/kg more than this for aluminum [https://www.google.com/search?q=what+is+the+embodied+energy+of+aluminum&oq=what+is+the+embodied+energy+of+aluminum&gs_lcrp=EgZjaHJvbWUyBggAEEUYOdIBCDMwNzdqMGo0qAICsAIB&sourceid=chrome-mobile&ie=UTF-8] | *Compare to steel at 20 MJ/kg [https://www.google.com/search?q=what+is+the+embodied+energy+of+steel&sca_esv=9360e7f17122653e&sxsrf=ADLYWILnZrV0U_M4TyJlSYlQDrEA_SXC-g%3A1733191918085&ei=7mhOZ7jfBKOYptQPs_3d0AQ&oq=what+is+the+embodied+energy+of+steel&gs_lp=EhNtb2JpbGUtZ3dzLXdpei1zZXJwGgIYAiIkd2hhdCBpcyB0aGUgZW1ib2RpZWQgZW5lcmd5IG9mIHN0ZWVsMgUQABiABDIFECEYoAEyBRAhGKABMgUQIRigATIFECEYoAEyBhAAGBYYHjILEAAYgAQYhgMYigUyCBAAGIAEGKIESMVQULMVWN9NcAJ4AZABApgBwQGgAdwbqgEEMjcuObgBA8gBAPgBAZgCDaAC_AeoAg_CAgoQABiwAxjWBBhHwgIHECMYJxjqAsICChAjGCcY6gIYiwPCAg8QIxiABBgnGIoFGEYY-QHCAgQQIxgnwgILEAAYgAQYkQIYigXCAgoQABiABBhDGIoFwgIREC4YgAQYsQMY0QMYgwEYxwHCAgoQABiABBgUGIcCwgILEAAYgAQYsQMYgwHCAggQABiABBixA8ICDhAAGIAEGLEDGIMBGIoFmAMRiAYBkAYIkgcEMTEuMqAH-Y8C&sclient=mobile-gws-wiz-serp], and 200MJ/kg more than this for aluminum [https://www.google.com/search?q=what+is+the+embodied+energy+of+aluminum&oq=what+is+the+embodied+energy+of+aluminum&gs_lcrp=EgZjaHJvbWUyBggAEEUYOdIBCDMwNzdqMGo0qAICsAIB&sourceid=chrome-mobile&ie=UTF-8] | ||
Revision as of 22:10, 4 December 2024
PV Panel Embodied Energy
See this reference for more detail [1]- And this discusses poly si vs mono si [2]
- embodied energy of 165-375 kWhr/kg [3]
- Good news - 65% of all energy goes into the wafers, as opposed to everything else (glass + All + EVA) according to same link
- Similar for amorphous silicon [4]
- Compare to steel at 20 MJ/kg [5], and 200MJ/kg more than this for aluminum [6]
- How many grams of silicon are needed for 1kW of PV panels? 2 kg [7], based on 2g/W.
- 5% of weight of PV is silicon [8]. 76% is glass, 10% is aluminum, and 10% is EVA.
- Embodied energy of EVA is about 80 mega joules per kilogram [9]
Total for 1kW of PV
- 600 kWhr for 2 kg of silicon
- 3kWhr per kg for glass, or 90 kWhr for 30 kg glass. [10]
- About 40 kWhr per my of EVA/aluminum x 8 kg = 320 kwhr
- Total 1010 kWhr
- 365*6kWhr~2100 kWhr/yr
- Payback is thus 1/2 yr with only the above.
- This matches results from Fraunhofer 2021, close enough - .7-1.4 year payback time. [11]
Links
- DIY Glacial Acetic Acid
- Wikipedia says 585 kWhr/m2 of PV panels? [12]