Is it better to build packs based on runtime or average voltage?
#16
Re: Is it better to build packs based on runtime or average voltage?
Originally posted by AWOLsoldier
Inquiring minds want to know.
Inquiring minds want to know.
Going back to the original question. Obviously we aren't talking about having packs with huge variations in runtime within each cell. So I think the best way (considering we are talking upper proce packs) is voltage since a pack that is matched to 342 seconds but may be a .1 off in voltage vs a 335 with .1v more voltage I'd take the higher voltage. Ultimately if we are talking ideal conditions we want 6 clone cells on every pack.
#17
Tech Master
iTrader: (4)
runtime..... a issue for 12th scale Mod (8 min heats )and at our track for Mod TC (5 min heats) both will/can dump before race is over depending on driving, motor, etc.
voltage..... plays it's hand best in any stock class
packs with both on the hi-end have a higher average voltage thru-out the heat
i have seen packs rated at 1.170v 424 sec put out a higher average voltage in a 5 min test than a pack from rated at 1.178v 395sec (both from same company)
things that make you go HMMMMM........
most cars ran in 4-5 minute heats do not draw a continous 30 amp rate or do they drain each sell down to the .9v each cell cutoff.
after about 6 races, the numbers on your pack can get worse or better depending on how you treat them. either way the cells start drifting and the pack, ideally should be rematched for accurate numbers
voltage..... plays it's hand best in any stock class
packs with both on the hi-end have a higher average voltage thru-out the heat
i have seen packs rated at 1.170v 424 sec put out a higher average voltage in a 5 min test than a pack from rated at 1.178v 395sec (both from same company)
things that make you go HMMMMM........
most cars ran in 4-5 minute heats do not draw a continous 30 amp rate or do they drain each sell down to the .9v each cell cutoff.
after about 6 races, the numbers on your pack can get worse or better depending on how you treat them. either way the cells start drifting and the pack, ideally should be rematched for accurate numbers
Last edited by fast-ho-cars; 12-30-2003 at 02:20 PM.
#18
Tech Champion
iTrader: (17)
Re: Re: Is it better to build packs based on runtime or average voltage?
Originally posted by DerekB
Ultimately if we are talking ideal conditions we want 6 clone cells on every pack.
Ultimately if we are talking ideal conditions we want 6 clone cells on every pack.
#19
i have seen packs rated at 1.170v 424 sec put out a higher average voltage in a 5 min test than a pack from rated at 1.178v 395sec (both from same company)
Which pack would I choose? I would choose #1. I say this because the voltage is being averaged over a much longer time. This tells me that at say 3 minutes, pack #1 will more than likely have higher actual voltage than pack #2. Think of it this way, which pack has higher actual voltage at 415 seconds?? Obviously #1, cause #2 is allready toast. Its interesting, in my experience, even at 20 amps, the average voltage #'s are not THAT much higher (they are higher, but not a whole lot) This is because the cell spends so much time discharge BELOW the average, that is pulls the average down with it.