Thanks much Robert. From my experience in the energy conservation
industry, it is standard that any conservation measure must have a
payback period of less than three years to be considered a cost
effective investment (when you consider discounted future savings versus
the money and opportunity cost of the capital required up front), and
ideally less than one.
"Robert J. Bradbury" wrote:
>
> A while back we had a debate about solar cell efficiencies
> and whether or not they could recover the power used to
> manufacture them.
>
> For the efficiency records check the:
> "Information on Solar Energy" page (and sublinks)
> from the
> European Society for Quantum Solar Energy Conversion
> (http://www.esqsec.unibe.ch/).
>
> For the power recovery question, see:
> "Can Solar Cells Ever Recapture the Energy Invested in their
> Manufacture?", R. Corkish (http://ecotopia.com/apollo2/pvpayback.htm).
>
> Strange that I didn't find these previously. Either Northern
> Lights is a better technical search engine or more information
> is slowly creeping onto the web.
>
> Robert
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