But you'd be better off with an ordinary battery. I'm quite sure those things cost a fortune.
Yes, they cost your soul (almost), but that's not the only reason to NOT use them for motor power.
The 5kF is only 2.7V max.
and it's 16.5cm x 7.2cm x 6.0cm (712 cm^3
) and weighs almost 1kg (930g to be exact).Doing the numbers
for a 100mA motor and accepting a useable range from 2.7V down to 1.5V:
For an average drain of 100mA, it is equivalent to 21 Ohm.
Discharge time is 17 hours, 8.5 minutes (that's the equivalent of ~1.7Ah).
During that time, around 6kC is removed at a start current of 128.6mA and an end current of 71.4mATo compare
, let's look at 2 NiMH cells of 1.7Ah
Each are 5cm long and 1.4cm in diameter (total 15.4cm^3
, i.e. only 2.2%
the size of the 5kF cap).
They'll drive the motors faster compared to the average speed on the 5kF, at ~2.4V steady through the entire period (i.e. motor speed reliable).
Or, take the same volume in NiMH and get close to 800 hours and you can get them in 2.7Ah capacity in the same size Supercaps
do have their purposes in low drain circuits, but they're not a cure all replacement for batteries and we fully agree that they should never be used for powering motors.