R/C Tech Forums

Go Back   R/C Tech Forums > General Forums > Electric On-Road

Reply
 
Thread Tools Search this Thread
Old 06-02-2002, 09:42 AM   #571
Tech Adept
 
Ian S's Avatar
 
Join Date: Dec 2001
Location: Leicester, UK
Posts: 241
Default

DW-how are those orion HV's holding up?
Ian S is offline   Reply With Quote
Old 06-02-2002, 01:39 PM   #572
dw
Tech Adept
 
Join Date: Nov 2001
Location: Burbage, Leics
Posts: 212
Default

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?
dw is offline   Reply With Quote
Old 06-03-2002, 03:47 AM   #573
Tech Regular
 
Join Date: Aug 2001
Location: Finland
Posts: 250
Send a message via ICQ to JesseT
Default

Don't forget that you can easily double or triple the resistance of the tungsten wire by varying its temperature (current).
JesseT is offline   Reply With Quote
Old 06-03-2002, 08:09 AM   #574
Tech Adept
 
blueboy's Avatar
 
Join Date: Feb 2002
Location: Birmingham, England
Posts: 114
Default

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
blueboy is offline   Reply With Quote
Old 06-03-2002, 09:16 AM   #575
Tech Elite
 
sosidge's Avatar
 
Join Date: Dec 2001
Location: Bristol, UK
Posts: 3,865
Default

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.
sosidge is offline   Reply With Quote
Old 06-03-2002, 09:44 AM   #576
Tech Adept
 
blueboy's Avatar
 
Join Date: Feb 2002
Location: Birmingham, England
Posts: 114
Default

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.
blueboy is offline   Reply With Quote
Old 06-03-2002, 10:39 AM   #577
Tech Adept
 
blueboy's Avatar
 
Join Date: Feb 2002
Location: Birmingham, England
Posts: 114
Default

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.
blueboy is offline   Reply With Quote
Old 06-03-2002, 11:28 AM   #578
Company Representative
 
Danny/SMC's Avatar
 
Join Date: Oct 2001
Location: Elkton, VA
Posts: 3,097
Trader Rating: 2 (100%+)
Default

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.
Danny/SMC is offline   Reply With Quote
Old 06-03-2002, 12:17 PM   #579
Tech Adept
 
Ian S's Avatar
 
Join Date: Dec 2001
Location: Leicester, UK
Posts: 241
Default

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.
Ian S is offline   Reply With Quote
Old 06-05-2002, 11:40 PM   #580
Tech Apprentice
 
Join Date: Nov 2001
Posts: 87
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).
Arnoud is offline   Reply With Quote
Old 06-05-2002, 11:57 PM   #581
Tech Adept
 
Iso Octane's Avatar
 
Join Date: Mar 2002
Location: Toronto, Canada
Posts: 111
Default

Quote:
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.
Iso Octane is offline   Reply With Quote
Old 06-06-2002, 01:53 AM   #582
Tech Elite
 
Trips's Avatar
 
Join Date: Aug 2001
Location: 360 Speedway
Posts: 2,251
Trader Rating: 16 (100%+)
Default

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.

Trips
__________________
MARSHAL!!
Trips is offline   Reply With Quote
Old 06-06-2002, 02:52 AM   #583
Tech Apprentice
 
Join Date: Nov 2001
Posts: 87
Default

`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.
Arnoud is offline   Reply With Quote
Old 06-06-2002, 10:24 AM   #584
Company Representative
 
Danny/SMC's Avatar
 
Join Date: Oct 2001
Location: Elkton, VA
Posts: 3,097
Trader Rating: 2 (100%+)
Default

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.
Danny/SMC is offline   Reply With Quote
Old 06-06-2002, 09:51 PM   #585
Tech Regular
 
purplepro3's Avatar
 
Join Date: Nov 2001
Location: Northern VA USA
Posts: 320
Default

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?
purplepro3 is offline   Reply With Quote
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
sanyo 3000HV ruftnik Rookie Zone 2 11-09-2003 06:05 PM
New Sanyo 3000HV PMR packs rayhuang R/C Items: For Sale/Trade 0 02-25-2003 11:18 AM
Sanyo 3000HV lilshortyc3 Electric On-Road 4 12-20-2002 02:34 PM
1 New Integy Sanyo 3000HV hohen711 R/C Items: For Sale/Trade 1 09-11-2002 01:31 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off



All times are GMT -7. It is currently 06:37 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
Powered By: vBulletin v3.9.2.1
Privacy Policy | Terms of Use | Advertise Content © 2001-2011 RCTech.net