This is false <| sep |> If a 16 year old backs their car into a pole and says I don ' t know what I did wrong I would also tell them that they are inexperienced . Just as I did here . It does further the conversation , you were asking why it wasn ' t being discussed because as an outsider you don ' t know the processes that go into such buying decisions . It was not a judgement it was a statement . You ' re not being talked down to and if you feel that way then it is on you . You asked a question and got upset because you didn ' t like the answer . <| sep |> andwhere ? there is notmuch usable surface left on the aluminium parts . <| sep |> I think the correct url had to beEnergy payback estimates for rooftop PV systems are 4 , 3 , 2 , and 1 years 4 years for systems using current multicrystallinesiliconPV modules , 3 years for current thinfilm modules , 2 years for anticipated multicrystalline modules , and 1 year for anticipated thinfilm modules see Figure 1 . With energy paybacks of 1 to 4 years and assumed lifeexpectancies of 30 years , 87 % to 97 % of the energy thatPV systems generate won ' t be plagued by pollution , greenhousegases , and depletion of resources .