Capacitor circuits for energy storage?
If you have an Ultracapacitor with the below specs…
Boostcap® Ultracapacitor
3000.0 Farad ± 20%; 2.7V
How many would you need to store 1KWH of energy? ( 1,000 watts for an hour)
The energy in Joules stored in a capacitor can be calculated with the following formula
E=(1/2) C V^2
for C=3000F V=2.7 Volts
E=10935 Joules
1Kwh = 3,600,000 Joules
Therefore you would need
3600000/10935 = 329.2 or rounding up
330 capacitors to supply 1Kwh of energy
Modern ultracapacitors are now approaching the energy density of the best batteries and have the advantage of very rapid charge and discharge currents
The device shown at the following link is very similar to the calculated result shown above
Capacitor Bank
These links are very useful for these sorts of calculations:
Energy storage in a capacitor