Revision as of 04:15, 3 December 2024

PV Panel Embodied Energy

embodied energy of 1000 MJ/kg or 300 kWhr! [1]
Compare to steel at 20 MJ/kg [2], and 200MJ/kg more than this for aluminum [3]
How many grams of silicon are needed for 1kW of PV panels? 2 kg [4], based on 2g/W.
5% of weight of PV is silicon [5]. 76% is glass, 10% is aluminum, and 10% is EVA.
Embodied energy of EVA is about 80 mega joules per kilogram [6]

600 kWhr for 2 kg of silicon
3kWhr per kg for glass, or 90 kWhr for 30 kg glass. [7]
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. [8]

@@ Line 14: / Line 14: @@
 *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. [https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.ise.fraunhofer.de/content/dam/ise/de/documents/publications/conference-paper/38th-eupvsec-2021/Salibi_4CO45.pdf&ved=2ahUKEwj6ktuX24qKAxULE1kFHRuNK0UQFnoECB0QAQ&usg=AOvVaw2JqyHcQq-XMWqot3f-Xcrs]
 =Links=
 *[[DIY Glacial Acetic Acid]]
 *Wikipedia says 585 kWhr/m2 of PV panels? [https://sustainability.stackexchange.com/questions/8317/what-is-the-typical-embodied-energy-of-a-solar-photovoltaic-panel#:~:text=According%20to%20the%20Wikipedia%20article,rated%20based%20on%20surface%20area.]