Sanyo 3000HV cells!

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Old 06-02-2002, 08:42 AM
  #571  
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DW-how are those orion HV's holding up?
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Old 06-02-2002, 12:39 PM
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Ian S I'm at uni.
I have only used the cells a couple of times as a result and haven't raced for about 10 weeks.
Finals start on Wednesday.
Another 2 weeks till I get to race again.
Are you back racing now?
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Old 06-03-2002, 02:47 AM
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Don't forget that you can easily double or triple the resistance of the tungsten wire by varying its temperature (current).
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Old 06-03-2002, 07:09 AM
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Hi guys.
I built my 15-bulb discharger and just tested on old 1700 pack on it, and the cells got really hot, 60*C / 140*F . I know they will get hot at a high discharge rate, but is this too hot?
Would it hurt to discharge them under a small fan to keep them cool or would this be bad (cool on the outside, warm on the inside)?

Thanks everyone
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Old 06-03-2002, 08:16 AM
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It's a bad idea to artificially cool cells that way, you'll make the outer surface seem cool, while the cell's insides are still hot.
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Old 06-03-2002, 08:44 AM
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ok then, but is it all right for the cells to be getting this hot during a discharge? I think I would rather have the cells feel cool than red hot after a cycle.
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Old 06-03-2002, 09:39 AM
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I know these nimh cells like to be used two or three times a day where the nicads were one-charge-a-day cells (correct me if I'm wrong). Question is should you discharge then charge the cells between runs or just top them up, re-peak style between runs?

Sorry for all the questions but these are my fist nimh cells and I dont wnat to mess them up.
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Old 06-03-2002, 10:28 AM
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blueboy: You should discharge them to 5.4 after each use. I suggest you run them 2 a day.

After a 30 amp discharge my packs are normally in the 190-200 farenheit range.
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Old 06-03-2002, 11:17 AM
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Dw- i dont really like buggy's so im not racing at hinckley, im doing the wednesday night series at Bedworth instead. i just bought some reedy extreme HV's to try out, no more dumping problems 4 me.
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Old 06-05-2002, 10:40 PM
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How to charge in this situation

I have been advised to charge my HV's in the following way: discharge the day before use, charge at 6A to 44 Celcius to the moment the batteries are needed at the track.

Problem is at our racetrack that the racestarts are never very clear and that therefore my cells ly around sometimes for 30 minutes before the race starts.... I would therefore prefer to do the following: Charge at for example at 5.5 A the day before the race and charge at 6A to the moment the cells are needed (in general it would only take about 5 minutes additional charge time, which is the heat before I need to drive!). Would this work ok for the cells or would you disagree? (I would only use the cells one time a day).
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Old 06-05-2002, 10:57 PM
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Originally posted by Danny/SMC
blueboy: You should discharge them to 5.4 after each use. I suggest you run them 2 a day.

After a 30 amp discharge my packs are normally in the 190-200 farenheit range.
I really thought the whole advantage of Nimh, besides the better run time, was the ability to use them whenever you pleased.

Meaning, it doesn't have to be fully discharged before being fully recharged, so that theoretically providing the temp was low enough, you can take the batt out of the car after a run, and pop it right into the charger.

This is what I thought, and what I was told by whomever I've asked. Which makes sense.

Is it possible all this "babying" is superstition more than what's really necessary?

I certainly hope so , because man, what a pain in the ass.
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Old 06-06-2002, 12:53 AM
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Arnoud,

I would not charge my race packs the day before, they'll feel really flat when you run them.

Best bet is to charge them up shortly before you run them. While it's best to have the charge finish right before you run, it can be difficult to time it exactly. If they finish a half hour or so before your run it's not a problem, just repeak them at 5 amps for 90 seconds right before the run and they'll be fine. For even better results, the Integy Torpedo might be a good bet. IT basically discharges at 15 amps for about twenty seconds, then repeaks. The process takes 5 minutes and the pack goes out warm and ready. I've been using the Torpedo for most of this past year and I've been very happy with it.

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Old 06-06-2002, 01:52 AM
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`Thanks. Sounds good. Problem might be that I'm in Europe and we do not have the same electric system in the US 110 Volt and in the Netherlands 220 Volt. The Integy repeaker looks great but I probably have to use my own charger to follow your instructions.
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Old 06-06-2002, 09:24 AM
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ISO Octane: You must realise that all the info we give out on care and maintenance is to get maximum power with good life expectancy out of your packs.
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Old 06-06-2002, 08:51 PM
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Danny: what should be the peak voltage of your charge set-up? i'd assume that at 6.0 amps for the HV, they'll hit 9.8v. isn't a high peak voltage indicative of high IR?
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