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Old 03-21-2006, 08:09 PM   #16
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Quote:
Originally Posted by killingtime
Thanks for the help guys!
Hi Mike,

Did you get my email with the response to your qustion regarding the usability of our conversion kit to other dischargers?

Isaac
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Old 03-22-2006, 06:31 AM   #17
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Hey Guys, I've been thinking about a similar sort of thing.

I have a Duratrax 20A discharger and was wondering if I could add some diodes to it to turn it into an equilizer. Would this work? Also what size diodes would I use?

Cheers
Ben
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Old 03-22-2006, 06:48 AM   #18
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Originally Posted by b3n
Hey Guys, I've been thinking about a similar sort of thing.

I have a Duratrax 20A discharger and was wondering if I could add some diodes to it to turn it into an equilizer. Would this work? Also what size diodes would I use?

Cheers
Ben
If you want it to be an equalizer, then remove all those resistors to lower the discharge rate. Then you can use .47ohm resistors with 3A diodes.
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Old 03-22-2006, 07:28 AM   #19
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Quote:
Originally Posted by XrayFK
If you want it to be an equalizer, then remove all those resistors to lower the discharge rate. Then you can use .47ohm resistors with 3A diodes.
can anyone tell me what is the purpose of using the diodes?
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Old 03-22-2006, 08:10 AM   #20
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The diodes stop the discharge when the voltage gets to a set value.
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Old 03-22-2006, 08:14 AM   #21
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Quote:
Originally Posted by b3n
The diodes stop the discharge when the voltage gets to a set value.
thanks for the reply!!! so what is the difference with a 3A diode and a 7A diode?
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Old 03-22-2006, 08:15 AM   #22
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If you have the Duratrax one I would get the Axxis Racing mod for it. Try PM'ing BATT_MAN on here to see its availibility.
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Old 03-22-2006, 08:17 AM   #23
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question

Does the conversion kit for the Zero30 that Batt_Man talks about hold the cells at .85v or do they immediate start gaining voltage after they hit the cut-off of .85v ?
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Old 03-22-2006, 09:01 AM   #24
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Quote:
Originally Posted by BATT_MAN
Hi Mike,

Did you get my email with the response to your qustion regarding the usability of our conversion kit to other dischargers?

Isaac

Yes Isaac, I did. Thank you.

btw... very fast follow-up
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Old 03-22-2006, 09:07 AM   #25
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i believe it keeps it at .85 as long as the batteries are kept clamped in the discharger
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Old 03-22-2006, 09:20 AM   #26
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Quote:
Originally Posted by zax
can anyone tell me what is the purpose of using the diodes?
Diodes have a forward voltage drop meaning that the voltage has to be so high for current to pass through. If the voltage is less than that limit then no current will pass through the diode.
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Old 03-22-2006, 09:22 AM   #27
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Quote:
Originally Posted by erock1331
question

Does the conversion kit for the Zero30 that Batt_Man talks about hold the cells at .85v or do they immediate start gaining voltage after they hit the cut-off of .85v ?
It should hold the cells at 0.85v because of the transistors. As soon as the voltage creeps above 0.85v the transistor base/gate will be opened and the cell would be discharged back down to the cutoff. I'm sure Axxis can confirm this for sure, but I believe that is how it is designed.
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Old 03-22-2006, 09:59 AM   #28
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Quote:
Originally Posted by XrayFK
Diodes have a forward voltage drop meaning that the voltage has to be so high for current to pass through. If the voltage is less than that limit then no current will pass through the diode.

so basically it's the diode that controls the cut-off?
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Old 03-22-2006, 11:13 AM   #29
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Quote:
Originally Posted by killingtime
so basically it's the diode that controls the cut-off?
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Old 03-22-2006, 12:19 PM   #30
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Quote:
Originally Posted by XrayFK
It should hold the cells at 0.85v because of the transistors. As soon as the voltage creeps above 0.85v the transistor base/gate will be opened and the cell would be discharged back down to the cutoff. I'm sure Axxis can confirm this for sure, but I believe that is how it is designed.
XrayFK,

RIGHT ON

Looks like you do know your electronics... (but in a transistor (NPN) the current flows from the collector to the emiter with the base controlling the flow. FET's have a SOURCE, GATE, and DRAIN )

As we all know batteries start regaining their nominal voltage when a load is removed. As a semiconductor is FORWARD BIASED current will flow and will keep the cell at the set voltage (0.85 volts). Since the 030 pulls a very large amount of current (25 amps @ 0.85 volts) the cell will cut off immediately (since it is at a high current, it is difficult to get exactly 0.85 volts...). After several minutes the cell voltage will start rising and the semiconductor will be forward biased again, thus bringing the cell down to 0.85 volts. (This is a continuous cycle…)

If the current would be lower (< 4 amps) better equalization can be achieved when the cut off is reached. What we recommend with the 030 is to leave the cells in the tray for an additional 15 to 30 minutes in order to get better equalization. As more current is drained out of the cells at the preset voltage the closer the cells cutoff voltage will be to each other.

I still recommend EQUALIZING the cells at a low current setting...because then you get real equalization. The lower the current setting, the better the equalization.

For those that want to treat their cells at a lower current, I still recommend cutting off one of the resistors (in each cell... R=0.05Ω) in the 030. By cutting one resistor off you will still discharge at 20+ amps, get better equalization, and your batteries will not reach such high temperatures. Cells last longer if NOT discharged at high currents, temp is kept lower, and the inner cell pressure is not pushed to the limits.
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