1:8 EP BUGGY (CASTER) or ANY BRUSHLESS CONVERSION THREAD
02-04-2009, 08:04 AM
#166
So what's the best price u've found for the 80A Hobbywing?
02-05-2009, 12:45 AM
#168
Hey,
Do u guys balance the cells at the track? I found out that when i m near to cutoff my batts not not balance 1 cell even go below 3.13?others are 3.8 or 4? why izzit so? i balance charge them always.
No pluffing also
btw for d telemetry system where shld i put my temp sensor?motor, esc or batt?
Do u guys balance the cells at the track? I found out that when i m near to cutoff my batts not not balance 1 cell even go below 3.13?others are 3.8 or 4? why izzit so? i balance charge them always.
No pluffing also
btw for d telemetry system where shld i put my temp sensor?motor, esc or batt?
02-05-2009, 04:31 AM
#169
02-05-2009, 05:55 PM
#170
Wow, be careful there. This symptom that u describe may be either -
1) bad cell starting to show
2) improper charging - what charger u using ? See my post above about my the imex B(no.) charger. I thought I was balancing with the balancing plug pluggged in but not so...
For a better safety margin using MMM, choose custom lvc cutoff with cutoff voltage of 3.1V per cell. U only lose about 100mah worth of capacity if u do this. Safer to accommodate the scenario u described where cells are badly our of balance after a run. One day, hopefully, manufacturers will put out products to monitor individual cell voltages but we can dream...
For the telemetry, u are the master of the system. Choose what u like lah. Normally put at the motor though but esc is also a good place but difficult to secure the sensor there.
Regards,
Joe Ling
1) bad cell starting to show
2) improper charging - what charger u using ? See my post above about my the imex B(no.) charger. I thought I was balancing with the balancing plug pluggged in but not so...
For a better safety margin using MMM, choose custom lvc cutoff with cutoff voltage of 3.1V per cell. U only lose about 100mah worth of capacity if u do this. Safer to accommodate the scenario u described where cells are badly our of balance after a run. One day, hopefully, manufacturers will put out products to monitor individual cell voltages but we can dream...
For the telemetry, u are the master of the system. Choose what u like lah. Normally put at the motor though but esc is also a good place but difficult to secure the sensor there.
Hey,
Do u guys balance the cells at the track? I found out that when i m near to cutoff my batts not not balance 1 cell even go below 3.13?others are 3.8 or 4? why izzit so? i balance charge them always.
No pluffing also
btw for d telemetry system where shld i put my temp sensor?motor, esc or batt?
Do u guys balance the cells at the track? I found out that when i m near to cutoff my batts not not balance 1 cell even go below 3.13?others are 3.8 or 4? why izzit so? i balance charge them always.
No pluffing also
btw for d telemetry system where shld i put my temp sensor?motor, esc or batt?
Joe Ling
02-05-2009, 06:26 PM
#171
yeah... depend what u want to monitor.. temperature of motor, ESC, battery... whatever u like.. 
02-05-2009, 07:04 PM
#172
Wow, be careful there. This symptom that u describe may be either -
1) bad cell starting to show
2) improper charging - what charger u using ? See my post above about my the imex B(no.) charger. I thought I was balancing with the balancing plug pluggged in but not so...
For a better safety margin using MMM, choose custom lvc cutoff with cutoff voltage of 3.1V per cell. U only lose about 100mah worth of capacity if u do this. Safer to accommodate the scenario u described where cells are badly our of balance after a run. One day, hopefully, manufacturers will put out products to monitor individual cell voltages but we can dream...
For the telemetry, u are the master of the system. Choose what u like lah. Normally put at the motor though but esc is also a good place but difficult to secure the sensor there.
Regards,
Joe Ling
1) bad cell starting to show
2) improper charging - what charger u using ? See my post above about my the imex B(no.) charger. I thought I was balancing with the balancing plug pluggged in but not so...
For a better safety margin using MMM, choose custom lvc cutoff with cutoff voltage of 3.1V per cell. U only lose about 100mah worth of capacity if u do this. Safer to accommodate the scenario u described where cells are badly our of balance after a run. One day, hopefully, manufacturers will put out products to monitor individual cell voltages but we can dream...
For the telemetry, u are the master of the system. Choose what u like lah. Normally put at the motor though but esc is also a good place but difficult to secure the sensor there.
Regards,
Joe Ling
02-06-2009, 01:46 AM
#174
I have tried auto settings before.. MMM does not have any issues with that... try it I think you will like it
02-06-2009, 04:03 AM
#176
in other words.. you force the charger to cutoff at 3.1v ? I think as long as the charger correctly detects the number of cells, cut-off should be fine.
However, we can't expect the charger to cure a bad lipo.
Perhaps you want to try to do a partial discharge, then full charge again. I know it's uncommon to do discharge for a lipo. But try it, maybe your bad cells can recover a little. No guarantee
02-06-2009, 05:13 AM
#177
I thought your question is you said you have two different cells 4S & 6S ??
in other words. you force the charger to cutoff at 3.1v ? I think as long as the charger correctly detects the number of cells, cut-off should be fine.
However, we can't expect the charger to cure a bad lipo.
Perhaps you want to try to do a partial discharge, then full charge again. I know it's uncommon to do discharge for a lipo. But try it, maybe your bad cells can recover a little. No guarantee
in other words. you force the charger to cutoff at 3.1v ? I think as long as the charger correctly detects the number of cells, cut-off should be fine.
However, we can't expect the charger to cure a bad lipo.
Perhaps you want to try to do a partial discharge, then full charge again. I know it's uncommon to do discharge for a lipo. But try it, maybe your bad cells can recover a little. No guarantee
02-06-2009, 06:28 AM
#178
Well, I'm not familair with the charger you are using so I can't really comment sorry.
If u run batteries of different cell count setting to custom cutoff is a hassle especially on race day or at the track where u don't have a pc. Looks like the best option is to still use auto cutoff in this case.
Regards,
Joe Ling
If u run batteries of different cell count setting to custom cutoff is a hassle especially on race day or at the track where u don't have a pc. Looks like the best option is to still use auto cutoff in this case.
Regards,
Joe Ling
02-06-2009, 06:43 AM
#180
oohh... MMM
yes i think that way too... unless all your packs are standardized to 4S or 5S only hehe.
Variance in cell voltage (unbalanced) cannot be avoided at times, but nevertheless the MMM should still detect the number of cells of the battery & still set the auto-cutoff accordingly
yes i think that way too... unless all your packs are standardized to 4S or 5S only hehe.
Variance in cell voltage (unbalanced) cannot be avoided at times, but nevertheless the MMM should still detect the number of cells of the battery & still set the auto-cutoff accordingly