Another factor is the charge/discharge efficiency. I've seen figures for NiMH ranging from 70% to 85%, and Li-ion of > 95%. Capacitors may be even higher, and should not degrade over time.Commercial ultracapacitors achieve an energy density of around 6 Wh/kg; NiMH batteries of around 60 Wh/kg; lithium-ion batteries of around 120 Wh/kg. ... The MIT analysis shows that the CNT ultracapacitor could have an energy density higher than 60 Wh/kg, a power density greater than 100 kW/kg (three orders of magnitude higher than batteries), and a lifetime longer than 300,000 cycles. At 60 Wh/kg, the CNT ultracapacitors would have comparable density to NiMH batteries.
Don't forget the "FLUX CAPACITOR" ...DAN!!!! "A three leaded ohms law defying work of Doc Brown genius...!DanMan32 said:The problem I see that isn't mentioned is how capacitors operate electrically. Voltage is proportional to charge with capacitors. Batteries ideally maintain their voltage until depleted.
I suppose though with an efficient voltage converter, the capacitor's varying voltage could be regulated.
...it's still "just one big capacitor"...charge / discharge...it's all relative whether this one is up while that one is down or passing each other in 'potential". Your still stuck with ohms law....RealAle said:How about a bank of capicitors controlled by a processor? By keeping some in varying states of discharge while others in different states of charging?
SMOP (Simple matter of programming).