kF
kilofarad
Capacitanceexact by definition
The kilofarad is one thousand farads. Nothing was ever this large until double-layer capacitors arrived; single supercapacitor cells now reach several thousand farads and the banks used for grid stabilisation and vehicle regenerative braking are quoted in kilofarads. The factor of 1000 is exact, being an SI prefix.
Watch out: A kilofarad sounds like an enormous energy store and is not. Energy is ½CV², and a supercapacitor cell is limited to about 2.7 V, so 3000 F holds roughly 11 kJ, about 3 watt-hours. The point of the technology is power and cycle life, not capacity.
| 1 kF | 1,000,000,000 μF |
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