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OT - EV Battery size

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Posted by drydem on August 21, 2008, 11:54 am
 
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


Posted by Cydrome Leader on August 21, 2008, 3:16 pm
 

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.


Posted by BobG on August 21, 2008, 3:43 pm
 
==========================
=======================
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


Posted by Cydrome Leader on August 21, 2008, 6:01 pm
 
The old VW beetles had about 30HP engines, struggled on highways and
that's without the 2400 pound battery pack.



Posted by Eeyore on August 24, 2008, 12:14 am
 

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



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