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Old 07-21-2002, 08:48 AM   #1
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Default dischargers

anyone know how to make a 30 amp discharger without using lightbulbs?
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Old 07-21-2002, 01:47 PM   #2
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using resistors?
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Old 07-21-2002, 05:31 PM   #3
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Let me know if you got a circuit for that.

The trouble with resistors is that you will not get a constant 30Amp. Given...

v=ir, v=7.2, i=30amp, r will need to be 0.24ohm.
and you will dissipate 216watt.

But you will also noticed that when a battery pack is discharging, the voltage will not be constant. So, you need a constant current regular. But, with so much power go to waste, it might make sense to discharge the power to charge, maybe an lead-acid cell.

So, constant current 30amp regulator to a step-up DC voltage, and to a lead-acid charger.

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Old 07-22-2002, 03:22 AM   #4
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Why do you need constant discahrge current? The motor aint excatly a constant current discharger....

The point in discharging is, well, discharging... if cells are stored with some capacity on, they get very slow.

The most important when discharging, is discharging on a pr. cell basis. This way you equalize and avoid cell-reversing. You should use an device with automatic cut off.

If there is some point in any further advanced discharging technique, it is simulating actual motor run. And that's the opposite of constant current !
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Old 07-22-2002, 08:28 AM   #5
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Integy makes a great discharger and you can buy either the 20 amp or 30 amp discharge rate version. The Indi Reactor 20 is about $40 online.
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