Robert Bruninga via EV wrote:
For what it is worth, I researched the improvements in battery
capacity since the Edison Nickel-iron EV battery in the 1900's.
Looks like it went from 20 Whr/kg to 400 Whr/kg on the latest Tesla
cells. A 20-to-1 improvement.
Ah, but a 20-to-1 improvement over 100 years is only about a 3%
improvement per year (i.e. $1 invested in 1920 at 3% compound interest
is $19.20 today).
For solar, I use the factor of about 200-to-one since 1970.
So solar is a heck of a lot better investment. :-)
Lee
--
A designer knows he has achieved perfection not when there is
nothing left to add, but when there is nothing left to take away.
-- Antoine de Saint Exupery
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com
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