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Capacitors in a pv system .....Wacky question #1

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Posted by mainehermit on October 16, 2007, 3:58 am
 
In a surplus buy a while back I got a new Aerovox 480 V 40 KVAR 3
phase series 2 commercial capacitor. - What a whopper !

My elementary understanding of the role of batteries as compared to
capacitors leads me to ask is there any way that a capacitor could be
used as an energy storage device in a PV system , or is this just the
dream of a guy with a huge capacitor  ?


Posted by Eeyore on October 16, 2007, 4:18 am
 


mainehermit@gmail.com wrote:


Forget it. The energy storage density of capacitors compared to batteries is a
joke.

Graham



Posted by rlsusenet@NOSPAMPUHLEEZschnapp on October 16, 2007, 5:37 am
 Eeyore wrote:

For further information, check out the graph of energy density vs power
density at http://en.wikipedia.org/wiki/Supercapacitor

Capacitors have excellent power density (ability to deliver enormous
amounts of power for a given weight) but poor energy density (ability to
deliver that power over a period of time for a given weight).

Posted by Eeyore on October 16, 2007, 5:58 am
 

"rlsusenet@NOSPAMPUHLEEZschnapp.org" wrote:


Those aren't supercaps you have.



Yes, they're still rubbish compared to batteries. Thank you for confirming what I
said.


Graham



Posted by Anthony Matonak on October 16, 2007, 6:40 am
 mainehermit@gmail.com wrote:

Capacitors can be used like batteries if you get them with large
enough capacity. Even the best of them only store about 1/10th the
amount of energy as lead acid batteries of the same size. This isn't
such a big deal in a stationary application like a house where space
can be found (or built).

The big problem is that ultra-caps cost a bundle. Lots more than the
popular flooded lead acid batteries and you'll never need the surge
capacity unless you want to operate rail guns, anti-missile lasers or
EMP weapons.

Anthony

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