Comparison of terrestrial PV and SPS

> I have yet to have a NiCd battery in my home last more than a matter
> of months before it basically becomes useless (only holds charge for
> about 10 - 20 minutes). My personal experience over 10+ years, and
> many batteries.

NiCd batteries have lots of problems -- but the guy (Stan Ovshinsky) who
invented amorphous semiconductors for use in among other things
continuous thin-film solar cell production also went on to do work on
NiMH batteries (and is now onto solar hydrogen and other things), and
from what I read these NiMH batteries do not seem to have the same
memory effect. (They may have other issues, including cost.) His
company: http://www.ovonic.com/

There are also things called ultracapacitors -- but I don't know much
details on them.

--Paul Fernhout