OT - EV Battery size

 Cobasys makes NiMh batteries for vehicles
http://www.cobasys.com/products/transportation.shtml
And their current production ready car battery system
the Series 1000 [1] would require alot of batties to run
a single car. Each 12V (8Ah) battery is 2.4kg - it has
a nominal energy of 108 Wh. Basically you get 45wh
per kilogram of battery.  How heavy would a battery
system be for an electric car? Suppose an engineer
was tasked to design a battery system for a 2 ton
EV which had a top sustainable speed of about
60 mph for 4 hours straight without refueling?. How
big would the battery system be?  Is such a
design criteria be unrealistic?

[1]
http://www.cobasys.com/pdf/transportation/Series1000Brochure.pdf

 
probably over 2 tons for the batteries alone, that's part of the problem
with electric vehicles that aren't forklifts circling around at 6mph in a
warehouse 1000 feet from a charger.

 
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Lets say you can cruise at 60 using 30hp... about 25KW... lets use 2
hrs instead of 4... you'll need a 50KW battery pack... thats about 460
of those 12c 108 whr batts...1111kgs...2400lbs

 
The old VW beetles had about 30HP engines, struggled on highways and
that's without the 2400 pound battery pack.

 

BobG wrote:


You're thinking pure EV with a decent range.

My numbers assumed a stupid commute only EV or PHEV. Still 2/3 of an
imperial ton or about 3/4 of a short US ton.

Graham