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Old 12-28-2003, 09:13 PM   #1
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Default capacitors on batts

has anyone done this to stiffin the curant
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Old 12-28-2003, 10:12 PM   #2
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While I have never tried it, I doubt it would work correctly, as it would be charging itself a lot more than you would want and since a capacitor has its own properties, it would take more to charge it then it would give out power wise.

Might take a trip to radio shack and grab some caps and see if it works, just make sure they can handle the power, both amps and volt wise.....

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Old 12-29-2003, 08:57 PM   #3
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I thought of that to but it would have to be mounted parrel
it would feed of the batts all the time
caps have been use in car sereo installs to give high curant draw amps more power quickly
most esc's have caps. on them now just wanting to know if more storage would help with punch
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Old 12-29-2003, 10:31 PM   #4
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I've been in car stereo for years, actually worked in the business for about 5 years........the cap system used in car stereo is a vastly different situation than ours. While car stereos use batteries, they also have the benefit of a constant charging system to power those batteries. Caps in that situation are used to provide power in high load situations when needed, which believe it or not, is not as often as us car stereo salesman would lead customers to believe. The cap on your ESC has the benefit of being internally regulated by the electronics in the ESC.

The easy way to find out though, is to grab some caps from an electronics store and hook them up.........don't be suprised if you hear a bunch of popping capacitors.

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Old 12-30-2003, 09:16 AM   #5
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Default Capacitor over the Battery

It works for punch (been there, tried that), but that's just a side effect.
The reason a capacitor is put on the battery is because is helps the Fet's of your esc to "shut" more easily. When the fet is open, a large current passes through it, when it shuts, the current won't stop that easily. It can't go back into the battery, since that's the source from which it eminates, so it's fed into the cap.
The reason you want this, is that the Fet is very inefficient when it is opening or closing. In either fully open or fully closed position it doesn't burn away much energy, but during the closing it does. The large current going through the fet when it closes would cause much heating and even inhibit the fet closing..
The trouble is, that a normal capacitor isn't quick enough to charge and discharge at the frequency's used by today's esc's. If you want to try one, get one from Novak or LRP.
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Old 12-30-2003, 05:13 PM   #6
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thanks for the info
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