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Batteries vs. Ultracapacitor Comparison PDF Print E-mail
Written by Greg Allen   
Sunday, 21 October 2007

I have been asked several times the past week for a comparison chart for batteries and ultracapacitors.  This chart and information came from LS:

The different unit between ultracapacitor (Farad) and battery (Ampere hour) makes users to get confused when adopting Ultracapacitor in their system.  The amount of energy stored in ultracapacitor can be easily calculated by using following equation:  Energy (Joule) = ½ x Capacitance (Farad) x Voltage2 (Volts) It can be converted from Farad for Ultracapacitor to Watt hour unit which is normally used for conventional rechargeable battery.   Energy (Watt hour) = Energy (Joule) / 3600 (sec)

Battery vs. Ultracapacitor
Readers have left 2 comments.
 No.1  Untitled
Is there a graph which represents the curve of increased storage capacity per cubic foot/meter of super capacitors over time? The advantages of super capacitors is pretty obvious, but as I understand it, they don't approach the highest density batteries just yet, and certainly not the energy storage value of a conventional gas tank.

Taking current experimental technologies into account (such as MIT's nanotube capacitor technology), it would be interesting to use a graph indicating improvements in capacitor storage over time from past to present, and use the curve to extrapolate:
When we might expect super capacitors to bypass batteries (using a similar curve for batteries).
When we might expect super capacitors to bypass gasoline in energy storage.
Frankenbike (Unregistered) • 2007-11-15 18:41:17
 No.2  Untitled
I feel that the ultracapacitor charge/discharge curve shown above is misleading. The energy is proportional to 1/2cv^2, which would result in a more battery-like form. i.e flatter for the most useful 1/4 to full part of the cycle. This is good for DC-DC converters and inverters because they don't have to deal with such large input/output voltage ranges.

I hope to hear more about the MIT and Renssalaer groups soon.
Guest (Unregistered) • 2007-12-08 22:20:33
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