[RE-wrenches] embedded energy in pv

[Exeltech]

PV energy "payback" is listed as 0.7 to 25.5 years, depending on the type
of module and the data you elect to use.

The preponderance of most opinion/data support 1 to 4 years as the period
for the equivalent embodied energy in a PV module to be produced by that
module, again depending on the module "chemistry" (crystalline, film, etc.)
and other variables.

Citations:
www.nrel.gov/docs/fy04osti/35489.pdf
http://energybulletin.net/node/17219
http://homepower.com/article/?file=HP127_pg32_Sanchez


Dan

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