looks like the BMS literally only interracts with the cells through the negative lead, which is interesting, for some reason i thought it would be more complicated and need to be in series with both VSCs or something.
and he just straight up solders the leads oh the packs together, no funny buisness. Looks almost easy?
watt hours is a better indicator
you get watt hours by multiplying the total pack voltage (6s is 6x3.6= if youāre using lipos, 21.6 volts) by the amp hours (6000mah is 6ah) to get watt hours. and 10 watt hours roughly equals 1km of range
so! assuming the cells are all 3000mah individuallyā¦
6s4p is 21.6volts x (3Ah x 4parallel) = 21.6x12 = 259 watt hours = ~25km range
6s3p is 19.4km
6s2p is 12.9km
6s1p is 6.4km
Series will add the voltage, parallel will add the amp hours and discharge rate. For the VESC higher voltages are definitely recommended depending on your kV, and hub motors generally have issues with heat dissipation so raising the voltage should lower the amps and heat, however how heat in a motor is generated seems to be debatable.
In series you would have 12S * 3Ah = 133.2Wh with 20C discharge and in parallel you would have 6S * 6Ah = 133.2Wh with a 40C discharge rate. Since lipos are capable of discharging high currents they generally do not need to be wired in parallel, your pack in series should be capable of 60A continuous and 120 in parallel. Li-ion packs need to have cells in parallel since their discharge rates are much lower (eg. 20A continuous for Samsung 25R cells).
C rating is what they use to show the discharge rate of a lipo pack. You multiply your packs amp hours (Ah) by the c rating to get max discharge rate. eg 20C * 3Ah = 60A
So the distance would be the same either way? I thought I understood that I would get about 13km with series but I thought it was about 25km in parallel. What is the difference between the 2? Isnāt parallel suppose to give me more distance and less speed and series to give less distance and more speed? I sound so stupid on hereā¦
Thanks for the input on my build. Do you have any experience with the ollin vesc/heatsinkā¦ I want to know if I will need a computer to set it up or if itās good to go out of the box? I currently donāt have a computer.
now iām wondering if thereās some way to spin up a blueduino and an android app to interface with the vesc. probably a real pain in the ass now that i think about it
Ok TB 12s ESCis an option.
Have you heard of the VESC connect or VESC connect lite app via Bluetooth? It looks sweet I found a video that enertion did on it he said you can completely bypass the need for a computer and do all your programming through your phone or iPad.
Do you have any insight?