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Old 04-12-2005, 04:36 PM   #1
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Default novak tray discharge rate

hello,

i just got a novak smart tray and i was wondering what the cutoff voltage should be for:

-GP3000
-GP3300
-SANYO 3600 MAH

should i just discharge them to 0.9?

btw i usually race weekly.

thanks!
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Old 04-12-2005, 04:42 PM   #2
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I usually go down to .9. It seems to work just fine for gerneal purposes.

I use the ds feature for shorting packs.
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Old 04-12-2005, 04:51 PM   #3
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ok thanks, so general rule is down to 0.9 for all packs above 3000mah...

that's what i thought, just wanted to make sure
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Old 04-12-2005, 05:13 PM   #4
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one more thing..

after the lights (LED's) on the tray went out, i measured the voltage on the SANYO 3600 MAH and each one was 1.11V even though the cutoff was at 0.9V

also, the team orion 3000MAH show 1.2 for each cell after the LED's go out

do you think that my voltmeter is wrong, or the tray doesn't do its job, or is this OK?

Last edited by tc3blue; 04-12-2005 at 05:26 PM.
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Old 04-12-2005, 05:33 PM   #5
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Hi Guys,

The Smart Tray will not "Hold" the cells at .9. Just takes them there and turns off.

Thanks
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Old 04-12-2005, 05:41 PM   #6
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so then you think that this

"after the lights (LED's) on the tray went out, i measured the voltage on the SANYO 3600 MAH and each one was 1.11V even though the cutoff was at 0.9V

also, the team orion 3000MAH show 1.2 for each cell after the LED's go out

do you think that my voltmeter is wrong, or the tray doesn't do its job, or is this OK?"

is OK?

i just wanna make sure that there's nothing wrong with my SMART TRAY. if the cells go up to like 1.1 in like 2 minutes after discharging what's the point of it then?
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Old 04-12-2005, 06:47 PM   #7
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The point is to equalize each cell. It's up to you to put it on the charger as soon as it's equalized.
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Old 04-12-2005, 10:55 PM   #8
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Quote:
Originally posted by tc3blue
one more thing..

after the lights (LED's) on the tray went out, i measured the voltage on the SANYO 3600 MAH and each one was 1.11V even though the cutoff was at 0.9V

also, the team orion 3000MAH show 1.2 for each cell after the LED's go out

do you think that my voltmeter is wrong, or the tray doesn't do its job, or is this OK?

If I'm not mistaken, the novak smart tray discharges at 2.7 amps per cell. Once the light goes out it means that the cell hit that .90 cutoff and when the light turns off the cell starts to recover, that is probably why you saw the cells at 1.11 volts. I have a rayspeed tray and I love it but I've watched the voltage at it will cutoff at .95 or higher. I just noticed it. I don't know for sure how accurate each tray is.
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Old 04-13-2005, 12:23 AM   #9
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Is it okay if I set the cut off point 0.5V per cell ?
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Old 04-13-2005, 12:40 AM   #10
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That's why I got rid of mine. I got one with the idea that it held the cells @ the cutoff voltage I set. Usually I'm not babysitting a pack waiting for the lights to go out just so I can hurry up to get it on the charger. Once I put it on the tray I want to forget about it until I'm ready. I went with the stackable Integy Zero 6S's that has a 0.0V cutoff and 'HOLDS' them there. If you truly want to get the most out of your packs by equalizing them, taking them all the way down to 0.0V before charging has proven to be the best and preferred method. Now for storing your packs after you race, taking them down to .9V is a very good method or as soon as you're done running them, store 'em
Just my .02cents -JB
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Old 04-13-2005, 01:31 AM   #11
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The cells have a nominal voltage of 1.2, so that is why once you stop discharging them, they start to build back up to 1.2v. Like Jaybee mentioned, the true way to equalize cells is to get them down to 0.0v and keep them trayed for a while. I use the Trinity Absolute Zero, and tray my batteries for 12-14 hours. I have done several controlled tests, to make sure this actually does anything, and it definately makes a difference. All in all, the cells' avg. voltage increased by about 0.015v, i/r went down 3-5 m. ohms, and I didn't notice any decrease in runtimes (some of my older packs actually got more).
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Old 04-13-2005, 01:49 AM   #12
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True enough. That's why i got rid of my Novak tray too after getting 4pcs of Team Much More Zero V.
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Old 04-13-2005, 02:10 AM   #13
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The Novak tray is designed to discharge your cells to the voltage you programme it to. It is not designed to keep them there.

If you want one of those, there are plenty around, but what's the point dropping your cells to 0 volts 2 weeks before you need to re charge them. You only need your cells to be equal before you start charging, so the Novak Smart Tray is ideal. It does the required job quickly, simply, and accurately.

I use one with our cells and we seem to produce the quickest cars at our track - whatever class we prepare cars for, so I suppose it must work.
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Old 04-13-2005, 02:15 AM   #14
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Quote:
Originally posted by JayBee
If you truly want to get the most out of your packs by equalizing them, taking them all the way down to 0.0V before charging has proven to be the best and preferred method. Now for storing your packs after you race, taking them down to .9V is a very good method or as soon as you're done running them, store 'em
Just my .02cents -JB
I don't think I ever mentioned anything about storing your packs for 2 weeks this way. If you want to store your packs for that long, one of the above methods will suffice. ... and for the type of battery care 'I' prefer, only dropping my cells to .1V (which the Novak S.T is only able to do unless you want to 'deadshort') isn't low enough for me. - JB
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Old 04-13-2005, 07:27 PM   #15
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I also never mentioned storing your packs on the tray. I tray the packs for 12-14 hrs. then charge it right after.
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