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Old 08-09-2006, 08:47 AM   #16
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Quote:
Originally Posted by EAMotorsports
One other thing is the SHV4200 will peak about 30 degrees HOTTER than a IB3800. Not sure why but most my 38's would peak around 130 degrees at .02. My 42's peak at 160 degrees with .02!!

EA

Eric, Isnt 160 temp for packs like way to High? Should we set our mV down to get teh 130 temp on teh SHV4200's??


Also, After racing..... should we dump the new packs slow? or like at a rapid rate like 20-30 amps? Im confused on this right now, I will be using 2 Pulsar 2's in teh future and what to find out what i should get to discharge/tray teh packs.

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Originally Posted by EAMotorsports
One other thing is the SHV4200 will peak about 30 degrees HOTTER than a IB3800. Not sure why but most my 38's would peak around 130 degrees at .02. My 42's peak at 160 degrees with .02!!

EA

Are you charging yoru packs inside in kooler weather or outside in this hot weather? Last week outside, i had to set my charger from 10mV/p to 5mV/p
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Old 08-09-2006, 08:51 AM   #17
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Originally Posted by EAMotorsports
One other thing is the SHV4200 will peak about 30 degrees HOTTER than a IB3800. Not sure why but most my 38's would peak around 130 degrees at .02. My 42's peak at 160 degrees with .02!!

EA
I've noticed that too. I ran three new packs last night and was temping them towards the end of the charge (or what I thought was the end) and saw that they were going to be over 130 degs. so I stopped the charge. They seemed a little flat on track. I'll reset my dropback to .02 (from .03) and see where they peak at.

Any tips on brush cuts/spring tension for 19t with the SHV's ? Thanks.
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Old 08-09-2006, 08:59 AM   #18
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Quote:
Originally Posted by BSchorr
Eric, Isnt 160 temp for packs like way to High? Should we set our mV down to get teh 130 temp on teh SHV4200's??


Also, After racing..... should we dump the new packs slow? or like at a rapid rate like 20-30 amps? Im confused on this right now, I will be using 2 Pulsar 2's in teh future and what to find out what i should get to discharge/tray teh packs.




Are you charging yoru packs inside in kooler weather or outside in this hot weather? Last week outside, i had to set my charger from 10mV/p to 5mV/p
No I wouldnt go any lower than .02 or 20mV as a pack...If your inside where its cooler .03 or 30mV is ok. After a run on a partial discharge 10 amps is ok...but I would not dump a full pack at a lower amp rate...Doesnt seem to be good for them. The SHV's dont seem to mind getting that hot...The 3800's did not like it though!!

Inside in my shop its usually 78-80 degrees and when I cycled a pack last night it was 169 degrees when it kicked to delay.

EA
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Old 08-09-2006, 09:20 AM   #19
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Thats Odd, I have my Pulsar Competition Charger set of 10mV for the pack and it gets to hot! Had to set it to 5mV for the pack which is like... .83mM per cell.. hrmmmmmm
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Old 08-09-2006, 02:10 PM   #20
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EA, YGPM

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Old 08-09-2006, 03:23 PM   #21
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so if i'm reading this right, it sounds like everyone is discharging down to 5.4v, but NO ONE is using a tray for these cells... correct?
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Old 08-09-2006, 03:25 PM   #22
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Originally Posted by quantum
so if i'm reading this right, it sounds like everyone is discharging down to 5.4v, but NO ONE is using a tray for these cells... correct?
I tray mine on a Much More CTX-D to .7 per cell in the 5 amp linear mode right before charging. Then after I run the pack I discharge it on the same CTX-D to .9 per cell in the 30 amp pulse mode and leave them till next weekend. If its going to be more than a week I will put 500 seconds of charge back into the pack after its cooled down.

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Old 08-09-2006, 03:25 PM   #23
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Quote:
Originally Posted by AdrianM
Cooling the cells like having a fan blow on them is really bad. It ends up increasing the IR and reducing the voltage. However, air circulation is ok. Like putting the packs under Much More fan stands with the fans pulling the air above the batteries up and away (not blowing down). This small bit of air moving keeps the batteries slightly cooler on a really hot day with no ill effects.

All IB cells like to be re-run. I ran 1/12th last weekend and for practice I just left the same battery taped in the car for 5 runs. After a run I would dump it at 10A let it cool and recharge it. It just got stronger and stronger.
hi adrian, you mentioned for practise you used the same pack for 5 runs... is that 5 cycles in the same day?

what would you do for a big race... charge twice in the same day, or more? is it the same as older cells where voltage goes up in 2nd, 3rd cycle, but runtime goes down?

thanks
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Old 08-09-2006, 03:27 PM   #24
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Quote:
Originally Posted by EAMotorsports
I tray mine on a Much More CTX-D to .7 per cell in the 5 amp linear mode right before charging. Then after I run the pack I discharge it on the same CTX-D to .9 per cell in the 30 amp pulse mode and leave them till next weekend. If its going to be more than a week I will put 500 seconds of charge back into the pack after its cooled down.

EA
i know thats a very good tray to use... is there another that you'd recommend? (cost conscious)

thanks!
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Old 08-09-2006, 04:49 PM   #25
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Quote:
Originally Posted by EAMotorsports
I tray mine on a Much More CTX-D to .7 per cell in the 5 amp linear mode right before charging. Then after I run the pack I discharge it on the same CTX-D to .9 per cell in the 30 amp pulse mode and leave them till next weekend. If its going to be more than a week I will put 500 seconds of charge back into the pack after its cooled down.

EA

There it is people, thats what you should do for the IB3800's/IB4200's/IB SHV4200's

EA, I ahve teh Smart tray.. Until I get teh Dyno Pulse Pro, is it ok to discharge the 4200 with a string of bulbs and cuttoff at 20 amps to 5.4? THen tray to .7 with my smart tray the next week?

Also Eric, I generally use 2 packs per class, 2 heats and a main is my clubs format. I reuse my 1st pack for the Main at the end of the night. Should I just stick it on after my frist race in 30 amp pulse mode? then go right into the .7 5 amp tray mode, Let totaly Kool for an hour or so, then charge it? Or should i just leave what ever mah's I have left in it form the first race and just recharge it?
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Old 08-09-2006, 05:44 PM   #26
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160 degrees without venting? I rarely let my cells get above 120. I guess I've been doing things wrong all along..

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Old 08-09-2006, 06:02 PM   #27
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So are these new IB cells safe to take below 0.9 without damaging them?
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Old 08-09-2006, 07:54 PM   #28
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Originally Posted by ford_racing
So are these new IB cells safe to take below 0.9 without damaging them?
Not if you are dumping them at a high rate in a series. Just follow EA's guidline, traying to 0.7v before charging is ok because at 5A, it won't be below 0.9v for very long.
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Old 08-10-2006, 12:31 AM   #29
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Quote:
Originally Posted by quantum
so if i'm reading this right, it sounds like everyone is discharging down to 5.4v, but NO ONE is using a tray for these cells... correct?
NO.

As long as there are more than one cell in the pack, there will be equalizing on trays.

Even Lipo's are supposed to be equalized occasionally from what I understand.
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Old 08-10-2006, 12:44 AM   #30
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Originally Posted by PitCrew
NO.

As long as there are more than one cell in the pack, there will be equalizing on trays.

Even Lipo's are supposed to be equalized occasionally from what I understand.

Eh...Think its call balancing...
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