Fukuyama Batteries
I'd hate to see what happens on full head-on collision..
10-16-2003, 09:29 AM
#752
Hi all
I was wondering if anyone on this thread has doen any similar testing to the graph that I have attached?
It is a Time vs Voltage graph of some of my older packs that were loaded with a 20 A lamp load.
Thanks
I was wondering if anyone on this thread has doen any similar testing to the graph that I have attached?
It is a Time vs Voltage graph of some of my older packs that were loaded with a 20 A lamp load.
Thanks
10-16-2003, 09:58 AM
#754
I have seen graphs like that. If you had some GP3300 cells, you would have a more clear picture of how far superior they are. At 300 seconds they would still be above or very near 7 volts.
10-16-2003, 10:14 AM
#755
John, Daniel or Jimmy-
I've been experimenting with variable rate discharge with some of my older packs with some success, and I'd like your input about it in relation to your cells.
My current discharger works like this:
Vmax to 6V: 20A
6.2-5.9V: 15A
5.9-5.7V: 10A
5.7-5.5: 5A
5.5-5.35: 1A
My thinking was that a lower discharge rate as the cells approached 5.4V would prevent the voltage bounce seen if the cells are run down to 5.4V at 20A and then pulled off (mine jump back to about 6.8V within a few seconds). I haven't had a chance to measure the discharge curves yet, but subjectively the packs I've cycled this way a few times seem to run just as strong as they used to, but a little longer.
Thoughts?
-dave
I've been experimenting with variable rate discharge with some of my older packs with some success, and I'd like your input about it in relation to your cells.
My current discharger works like this:
Vmax to 6V: 20A
6.2-5.9V: 15A
5.9-5.7V: 10A
5.7-5.5: 5A
5.5-5.35: 1A
My thinking was that a lower discharge rate as the cells approached 5.4V would prevent the voltage bounce seen if the cells are run down to 5.4V at 20A and then pulled off (mine jump back to about 6.8V within a few seconds). I haven't had a chance to measure the discharge curves yet, but subjectively the packs I've cycled this way a few times seem to run just as strong as they used to, but a little longer.
Thoughts?
-dave
10-16-2003, 11:18 AM
#756
Originally posted by Speed Demon
how about a pack for racers outside US??? For those who havent got a chances to order due to no dealer in their country yet??
ummm..... Jimmy,... get me a sample pack.....
how about a pack for racers outside US??? For those who havent got a chances to order due to no dealer in their country yet??
ummm..... Jimmy,... get me a sample pack.....
Dan
10-16-2003, 11:21 AM
#757
Re: 1st Race Results...(long)
Last edited by Maj. Teeth; 02-04-2004 at 04:31 PM.
10-16-2003, 11:24 AM
#758
Originally posted by holycow
THanks for the help john! I think I finally have the basics down on these gp3300s. BTW, the sanyo pack I have is actually a 3300 pack, not a 3000 pack. Now that I can properly charge and properly discharge these packs, I am looking forward to giving them a real test out there on the asphault.
THanks for the help john! I think I finally have the basics down on these gp3300s. BTW, the sanyo pack I have is actually a 3300 pack, not a 3000 pack. Now that I can properly charge and properly discharge these packs, I am looking forward to giving them a real test out there on the asphault.
Dan
10-16-2003, 11:26 AM
#759
Originally posted by holycow
Let me make sure I have this right before I get so confident
1. Store the cells bottomed out at 5.4v
2. Peak the pack at 6amps, with a 3mv cutoff.
3. Repeak just before the run at 6amps with a 1mv cutoff
4. after the run, discharge at 30amps.
5. let rest 1.5 to 2 hours
6. repeat whole process
7. No more then 2 or 3 charges/discharges in a day
I only plan on putting one pratice, and one race on each pack a week.
Let me make sure I have this right before I get so confident
1. Store the cells bottomed out at 5.4v
2. Peak the pack at 6amps, with a 3mv cutoff.
3. Repeak just before the run at 6amps with a 1mv cutoff
4. after the run, discharge at 30amps.
5. let rest 1.5 to 2 hours
6. repeat whole process
7. No more then 2 or 3 charges/discharges in a day
I only plan on putting one pratice, and one race on each pack a week.
Dan
10-16-2003, 11:28 AM
#760
Originally posted by rinkrat99
Hi all
I was wondering if anyone on this thread has doen any similar testing to the graph that I have attached?
It is a Time vs Voltage graph of some of my older packs that were loaded with a 20 A lamp load.
Thanks
Hi all
I was wondering if anyone on this thread has doen any similar testing to the graph that I have attached?
It is a Time vs Voltage graph of some of my older packs that were loaded with a 20 A lamp load.
Thanks
Dan
10-16-2003, 11:39 AM
#761
Originally posted by Maj. Teeth
That is correct! although when we have time to meet at the tracks, I'll let you in on another secret.
Dan
That is correct! although when we have time to meet at the tracks, I'll let you in on another secret.
Dan
You could always let me in on your little secret via PM
10-16-2003, 11:46 AM
#762
The secret is to discharge the pack, then place on an equalizing tray about 20 minutes PRIOR to charging.
Big gains!
Big gains!
10-16-2003, 11:48 AM
#763
Last edited by Maj. Teeth; 02-04-2004 at 04:32 PM.
10-16-2003, 11:50 AM
#764
Originally posted by PitCrew
The secret is to discharge the pack, then place on an equalizing tray about 20 minutes PRIOR to charging.
Big gains!
The secret is to discharge the pack, then place on an equalizing tray about 20 minutes PRIOR to charging.
Big gains!
Dan
10-16-2003, 12:21 PM
#765
Originally posted by Maj. Teeth
I hate to say this because it may sound like we have a dislike for Sanyos but to be honest, the 3000 were better then the newer 3300. We've had some extensive tests earlier this year and considering even the older 1st and 2nd gen GP3300 will out perform the Sanyo3300 both in IR and discharge voltage curves.
Dan
I hate to say this because it may sound like we have a dislike for Sanyos but to be honest, the 3000 were better then the newer 3300. We've had some extensive tests earlier this year and considering even the older 1st and 2nd gen GP3300 will out perform the Sanyo3300 both in IR and discharge voltage curves.
Dan
My newer GP's blow ALL of my Sanyo's out of the water.
Rob