I plan on using a 3kv variac to convert that to 90 V AC. Then bridge rectified to DC using a 200v, 100 amp full bridge rectifier... Then using 2 (63 volts, 100,000uf ) capacitors in series, for a total filter of 50,000uf as they are in series and rating of 126volts... I heard that you got to multiply the 90 volts by the square root of 2 rms, so thats around 130 volts, which is the upper limit of the ebike controller... I just want a smooth DC voltage as long as if its between 90v and 130v (despite title saying 96v).

The problem is i need a pure DC source and my calculations on ripple for C = I / (2 x f x Vpp) , says C = 30 amps / (2 x 60hz x 0.1v ripple) = 2.5 Farads... That is a a big difference from the 50,000 uf... Any help / suggestions here. Thanks