Oil sucks, wind blows.
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C = (t * I) / V Where: I = average load current drawn on DC sideV = ripple voltage peak-to-peak t = duration between charging cycles and is equal to: 1/twice mains frequency. In Europe the mains frequency is 50Hz, so: t = 1/100 = 0.01 seconds. In America the main frequency is 60Hz, so t = 1/120 = 0.0083 seconds
http://en.wikipedia.org/wiki/Ripple_voltage
C = (0.0083*2)/0.5
C= 33000 uF