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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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... and expense. Which, is simply another way of saying layers of inefficiencies.
That is, battery tech is expensive to produce and is used where the (limited) lifetime cost can be justified.
PV Solar tech is expensive to produce and is used where the (limited) lifetime cost can be justified.
Both technologies have diminishing energy returns. To wit, the iphone 4 that can't hold a charge anymore.
JYL, if you see a path to saving the USPS a bunch of money wouldn't others, say Elon sho-me Govt money Musk, be all over that already?
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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