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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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true efficiency...
This is something engineers live for. In an engineer's world, optimization is king.
And where does that optimization land, time and time again?
hint, you have one in your garage.
This OP notion --of post office PV solar panels, charging batteries, such that postal vehicles can then have those mobile batteries charged, so that they can convert that power back to fwd motion the next day-- is fraught with layers of inefficiencies.
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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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