[ExI] Small scale solar payback time (was Re: Planetary defense)

[Keith Henson]

On Tue, May 17, 2011 at 12:01 AM, Eugen Leitl <eugen at leitl.org> wrote:
> On Mon, May 16, 2011 at 11:19:37PM -0600, Kelly Anderson wrote:
>
>> Ok Keith, I see where I went off the tracks now. You're talking about
>> ENERGY payback time, and at the time I was thinking about monetary
>
> EROEI is always preferable to EPBT. You can have short EPBT at
> negligible EROEI, e.g. if you use polymer PV which burns out
> in a couple years.

If you had a polymer PV that had an energy payback time of a couple of
months and lasted 2 years, that would be possible to grow energy on
the energy harvested, i.e., short doubling time.  PV that takes years
to pay back the energy used to make it has a slow doubling time.

I would rather have a short EPBT.  YMMV.

Keith

>> payback time, which is completely different. My apologies for the
>> misunderstanding.
>
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