selfmade homemade DIY supercap ultracap bcap boostcap

[Paul-R]

What capacity and voltage rating are you guys expecting?

[MileHigh]

What capacity and voltage rating are you guys expecting?

Great question!  I have a feeling it is going to be in microfarad territory, not supercap territory.

Experiment and learn as they say.  You will probably need scopes to measure your capacitance's.

MH

[hartiberlin]

It depends only on the surface contact area between the alufoil and graphite.

If you are using 1 x 1 meter of alufoil and 1 x 1 meter of graphite paper,
you should expect a capacity in the range of 100 Farad or more.

Have a look at this good PDF file:

http://www.ansoft.com/firstpass/pdf/CarbonCarbon_Ultracapacitor_Equivalent_Circuit_Model.pdf


Regards, Stefan.

[Robert]

AA batteries have carbon cores that can be reused....

Old batteries is an endless supply of carbon powder.

[V_Schaub]

Hi.
I have few questions regarding the main design in this topic.
In my test project i want to create 400V capacitor bank to charge one 2kw device for one hour.

1.) How much supercapacitors should I build to make this work and how much Farrads should one SC need to have ?

2.) If i use aluminum/salt/graphite (active carbon or maybe graphene ) design, would it be possible to create 400V / 200F capacitor ? The size does not matter, it can be big cca 1 meter and over 50cm thick

3.) When you put saltwater between graphite and aluminum you have created battery. My question would be:
What will happend when aluminum will be coated with aluminum oxide. Basically when aluminum starts to oxidize ? Will the supercapacitor still work / will it loose its capacity or something else ?

4.) What would happend if i would use carbon or graphite as second plate ( instead of aluminum ) ?

Thank you in advance for your ideas/comments !