HI, new here, been reading and reading and reading. The amount of information is CRAZY? I really enjoy reading of others adventures in ebiking so much that I decided to make my own. What I have amassed is as listed:
Flipsky FSESC4.2 50A esc (vesc clone) 4s-13s (60v max)
Turnigy Aerodrive 6364 190kv 65a 10s lipo
18650 2ah 30A 7.2 watt/hr
I think I have read myself into endless circles and would like some input.
I know this is probably very simple stuff, thank you for your patience.
With that I am converting mtn bike to ebike with friction drive brushless outrunner.
I am attempting to loosely follow an instructable by someone calling themself machinecrafted, I thought I had found the original idea on here but for the life of me can't find the post.
It is based on a swinging 63mm outrunner tied to a Vesc controller. To simplify control I substituted a wireless skate board throttle. And it works! That is the good news. It doesn't work well though.
Initially I had planned on running it at 10s (18650). I even ordered the batteries and successfully built the battery. It only became an issue when I decided that I would like to cycle it. I do have some experience building batteries, the batteries were new, top balanced and it has a bms but I could not charge it as my lipo charger only goes to 6s. When trying to find a 10s charger I found out that they liked them way more than I did.
Since the motor is rated for 60volts I decided to build three packs of 4s batteries and run them in series. These batteries I could charge and my charger would give me reliable/relative feedback. I thought things were going well. My batteries are 2ah/7.2 watt/hr with max d/c of 30 amp.
To start things off slow I decided my initial test would be one pack of 4s3p. Static test were good, motor had enough torque to grab the tire and the riding test with my 100 kilos on the back was a success and as expected had lack luster speed and almost no torque. Ride two began with two packs totaling 8s3p. Speed and torque was better but not by much. I have not run all three packs in series as of yet.
My question is how do the bms/esc/battery work together to get torque to the motor? The way I figure it I should be capable of 90 amps from the battery. My bms however is rated at 30 amps, does this form a bottleneck? I set my ESC to 50A.... how does that relate to the previous?
After not finding my answers here I googled a bunch and found some seriously terrifying information about running packs in series, of course this was an engineering forum but since the battery pack is basically sitting between my legs I all of a sudden developed anxiety, lol. Is it relatively safe to run lipo packs in series?
I know this is long but to reiterate I am looking for help with the following:
My question is how do the bms/esc/battery work together?
Should I get a shunt monitor to answer my questions?
Will running 4 4s3p packs in series be a serious problem?
What monitoring system is recommended?
If you got this far you are a trooper and I thank you!
Any feedback would be appreciated,
ERN
Flipsky FSESC4.2 50A esc (vesc clone) 4s-13s (60v max)
Turnigy Aerodrive 6364 190kv 65a 10s lipo
18650 2ah 30A 7.2 watt/hr
I think I have read myself into endless circles and would like some input.
I know this is probably very simple stuff, thank you for your patience.
With that I am converting mtn bike to ebike with friction drive brushless outrunner.
I am attempting to loosely follow an instructable by someone calling themself machinecrafted, I thought I had found the original idea on here but for the life of me can't find the post.
It is based on a swinging 63mm outrunner tied to a Vesc controller. To simplify control I substituted a wireless skate board throttle. And it works! That is the good news. It doesn't work well though.
Initially I had planned on running it at 10s (18650). I even ordered the batteries and successfully built the battery. It only became an issue when I decided that I would like to cycle it. I do have some experience building batteries, the batteries were new, top balanced and it has a bms but I could not charge it as my lipo charger only goes to 6s. When trying to find a 10s charger I found out that they liked them way more than I did.
Since the motor is rated for 60volts I decided to build three packs of 4s batteries and run them in series. These batteries I could charge and my charger would give me reliable/relative feedback. I thought things were going well. My batteries are 2ah/7.2 watt/hr with max d/c of 30 amp.
To start things off slow I decided my initial test would be one pack of 4s3p. Static test were good, motor had enough torque to grab the tire and the riding test with my 100 kilos on the back was a success and as expected had lack luster speed and almost no torque. Ride two began with two packs totaling 8s3p. Speed and torque was better but not by much. I have not run all three packs in series as of yet.
My question is how do the bms/esc/battery work together to get torque to the motor? The way I figure it I should be capable of 90 amps from the battery. My bms however is rated at 30 amps, does this form a bottleneck? I set my ESC to 50A.... how does that relate to the previous?
After not finding my answers here I googled a bunch and found some seriously terrifying information about running packs in series, of course this was an engineering forum but since the battery pack is basically sitting between my legs I all of a sudden developed anxiety, lol. Is it relatively safe to run lipo packs in series?
I know this is long but to reiterate I am looking for help with the following:
My question is how do the bms/esc/battery work together?
Should I get a shunt monitor to answer my questions?
Will running 4 4s3p packs in series be a serious problem?
What monitoring system is recommended?
If you got this far you are a trooper and I thank you!
Any feedback would be appreciated,
ERN
