And because capacitors does not suffer the wear caused by chemical reactions, they also last a lot longer.
if we drain our car battery to much and try to start our car it will cause more damage to the car battery and eventualy it will not charge back up to it's maximum again. However this is not true for super capacitors.
For example a capacitor the size of a D-cell battery, has a capacitance of about 20 microfarads. But if we take a similarly sized supercapacitor, it has a capacitance of 300 Farads. What this means is at the same voltage, the supercapacitor could in theory store up to 15 million times more energy.
However a typical 20-microfarad capacitor would be able to handle as much as 300 volts, while an ultracap would be rated at only 2.7 volts. At a higher voltage, the electrolyte inside the supercapacitor starts to break down. So in reality an super capacitor have the ability to store about 1,500 times the energy of a similar sized capacitor. This would be something you would need to take into consideration in you're attempts on storing energy in a capaciator.
Supercapacitors are very effective at accepting or delivering a sudden surge of energy, and that makes them a good alternative for a regular 12v car battery.
With electric cars for example super capacitors provide the power needed for acceleration, while a battery provides range and recharges the supercapacitor between surges.
While some electric vehicles are using super capacitors for acceleration. The devices also appear in hundreds of other applications, from cell phone base stations to alarm clocks to audio systems.
If you like to use supercapacitors instead of you're car battery they could provide power during stops (running lights, radio, air conditioner, etc.).” They would also provide power for the restart, and then be “recharged during the next interval of travel.”
Building you're own DIY car battery replacement with supercapacitors
So where can can i buy a +12 volt capacitor?Actually this is what you would need to do. Get 6 ultracapacitors connected together (normally they have about 2.5 Volts each)
What you would need are, 6 supercapacitors (normally they have about 2.5 Volts each)
So 2.5 Volts x 6 = 15 Volts fully charged. You could do with only 5 super capacitors giving you 12.5 Volts but it's not recommended, you need the extra volts to be there. Besides you're alternator will put out more than 12.5 volts when it's charging anyways. Most cars have some electronics that drain you're battery like the car alarm. So if you leave you're car standing for a week the supercapacitors might have drained to much and you will not be able to crank over the engine.
With 14-15 Volts you wont be having any problem starting you're car even if you leave it for 4-5 days. However any drain can be stopped with a simple solar panel to recharge the supercapacitors, so if that is done you always should always have them fully charged and ready to start you're car.
Another interesting thing replacing you're car battery with super capacitors are the weight. A normal lead acid car battery have a weight around 30 pounds. However installing supercapacitors in it's place you will actually save around 25 pounds in weight.
What all this boils down to is you will save weight = better gas milage
The ultracapacitor will charge up very quick and not load the engine as much = better gas milage
They will also probably last the entire life of the car = save you maintinance and money.
They will also prevent voltage drop when restarting the engine that could be causing aftermarket electronics to shut off like the stereo.
This can also be read on ☈ Ultra Capacitors VS Car Battery ☈