Revision as of 04:42, 3 December 2024

PV Panel Embodied Energy

See this reference for more detail [1]
And this discusses poly si vs mono so [2]
embodied energy of 1000 MJ/kg or 300 kWhr! [3]
- 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]

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]

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 =PV Panel Embodied Energy=
 *{{Check}}See this reference for more detail [https://greenchemuoft.wordpress.com/2017/12/12/embodied-energy-and-solar-cells/]
+*And this discusses poly si vs mono so [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 1000 MJ/kg or 300 kWhr! [https://www.google.com/search?q=embodied+energy+of+solar+grade+silicon&oq=embodied+energy+of+solar+grade+silicon&gs_lcrp=EgZjaHJvbWUyBggAEEUYOdIBCTE0NzE0ajBqNKgCArACAQ&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]