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Hi Electricar

You want 125 amps for 20 seconds while your pack may sag 10 volts

125 x 20 = 2500 divide by 10 = 250 Farads

you have - 10,000 micro farads = 0.01 Farads - your current capacitors can only give you 1 / 25,000 of what you want

ie 1/10th of an amp for second

Ultracaps are measured in Farads - unfortunately you need to put them in series to get the voltage

if you need 10 ultracaps to get your pack voltage the capacity of the string is reduced,

10 off 250 Farad ultracaps in series have a capacity of 25 Farads so to achieve your 250 Farads you would need 10 off strings of 10 250 Farad capacitors

100 - 250 Farad capacitors!
 
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