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Electric Vehicle Recharging Infrastructure Needed PDF Print E-mail
Written by Greg Allen   
Monday, 07 April 2008
Article Index
Electric Vehicle Recharging Infrastructure Needed
Page 2
 No.10  Energy Density
The energy density of capacitors is a little misleading. On paper they seem to hold less energy per pound. When, however, you consider that it damages batteries to discharge them much past 50% and even less than that will greatly extend their life, then batteries and capacitors have about the same initial energy density. Batteries can often start to seriously degrade after 300 - 500 cycles, depending on conditions. Capacitors are usually still at full capacity after 1000's of cycles. I would say that the modern ultracapacitors will have a much higher energy density than batteries after both have been used for a year. Replacing $4000 worth of batteries every year or 2 does not seem easy or cost effective.
Guest (Unregistered) • 2008-11-16 21:04:00
 No.11  Untitled
I would like to add that about the comment above: "By the way 52 kwh is the same energy as about 1.5 gallons of gasoline." Well there is more to it than that. Internal combustion engines only get a little less than 9 Kwh of energy from a gallon of gas, the rest is wasted. (see http://www.lifeaftertheoilcrash.net/Research.html) That makes the 52 Kwh these capacitors can store equal to about 6 gallons of gas. Which is why they expect to get up to 400 miles out of them in an efficient, small car (equal in efficiency to about a 65mpg gas car in this case).
Guest (Unregistered) • 2008-11-17 01:08:01
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