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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