Designing a capacitor bank

hello im still a student and im stuck on designing a capacitor bank.

i have nothing to start with, its a project, and i want its input to be 12v (storage).

im trying to google capacitor banks and trying to simulate my own using pspice but i keep getting floating nodes and missing resistors or inductors that are not used in most capacitor banks online. 

to design the bank is all i need, so i can build it later

Thanks

In order to design this, you will need to provide the total energy you need to store, the max current you need to provide to the load and the max current that can be drawn from the source during charging.

Simple capacitor banks can just be one or more capacitors with diodes to do current steering. When the currents and capacity of the bank goes up you have to start doing constant current charging.

Charge/Discharge repetition rate can also be an issue for capacitor heating and lifespan.