OK here is the question i want to build a power supply 12-20 V 250 amp. i am trying to figure the capacitance needed i am coming up with 1.2 F am i close? or is my math off and how do i come up with what capacitance needed and can i use something else other than 25 v cap's. can i use 30 or 50 volt cap's? and what is the difference going to be using a larger voltage cap. help i am no electronic student but i am trying to self learn what i need to work on stuff. schooling would be nice but i cant afford it and I'm getting to old to switch field's. but a better understanding of electronics would help my current field of work. thank you for helping out on an old fool's quest for knowledge.