Quote:
Originally Posted by RedDevil
Two hundred or so of these ultracapacitors would do the job.
If you have the right electronics to convert the voltages at high currents, and a lot of excess capacity in your wallet. |
Supercaps have enough capacity now to build a (EXPENSIVE) pack to supply the currents you are likely to need (2000-ish amps) for 10-ish seconds.
The packs that racers use appear to lean toward pouch cells instead, that have insane discharge rates. Like 30 a-h cells with 50C discharge rates.
I would add that the Supercaps are still capacitors, so they leak, and they don't leak at the same rate. They get unbalanced quickly without a management system to balance the charge. And when you exceed the rated voltage per capacitor, even a little bit, they fail.
So add some more cash for a balancing system as well. High current balancing is not required, but balancing is required.
Jack over at EVTV had a bank of supercaps wired up that would run his car for about 5 minutes. It was not all that heavy but it certainly took up a bunch of room. This was a few years ago so things have gotten smaller, and the max currents are higher.