Yes you will need a BMS to cell balance. Also be aware that you will not
be able to get all the power out. Capacitor voltage drops as energy is
taken out. A battery outputs a fairly constant voltage and then drops
when the energy is almost depleted. Decide on the low voltage you don't
want to go down and then there are online energy calculators that will
calculate how much power the capacitor array will deliver. A 2700F
capacitor is about equivalent to a 3.5Wh battery in terms of energy
storage and that is going from 2.7 to 0v. Do the sums and I think that
wth the Prestolite taking about 100Amin and 72V in a light use scenario,
the capacitor bank will not provide much range.
Steve
On 21/04/2020 14:00, Jay Summet via EV wrote:
Hurm....you'd need to limit upper voltage of each "cell" to prevent
harming the capacitors. I assume preventing full discharge is good to
prevent them from being reverse charged...but since supercaps can go
down to 0 volts with no harm, it is more likely that a full pack low
voltage cutoff would be able to work for that well enough, as you
probably won't be taking the full pack down anywhere near zero, so
there is a lot of safety factor there.
Jay
On 4/20/20 10:20 PM, Rebel Rebel via EV wrote:
I've found super caps rated at 2.7v 3000F and i wanted to use them in
both
series and parallel so you can get a high voltage but also keep
capacitance.
I have purchased a few and have been playing with them using them in
a cheap
RC car that lasts about 40 minutes on AAs 6v but with the Caps for
about 50
min at 7v. Obviously the voltage is different and that makes a
difference
but to me in theory it has potential. To add the super capacitors are
made
of Graphene and weigh about 38grams each and 18*65mm, so they are
extremely
light and compact for the power. I currently have 44 caps and want to
use it
with a Prestolite mtc-4001 motor In a custom made motorized bike. Anyone
have any suggestions? I know ill need to have a pretty custom BMS for
what
im thinking but I believe its possible.
--
Sent from: http://electric-vehicle-discussion-list.413529.n4.nabble.com/
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