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]

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]