I recently decided to take on the challenge of building an electric longboard. I’ve never owned one and have only ridden one a few times, though I use my non-electric one all day every day. There are a few bumps that I just cannot figure out though. My build includes 4 14.8v 16ah Lipo batteries, a C6374 2900w motor, VESC, BMS, etc (I will put links to my parts below). The main thing that I am stumped on is, the motor says it is 24-36 volts. I want to have two sets of batteries plugged in series, then plug those sets parallel, so I’ll end up with 29.6 volts in the end. I would want to get as close to 36 volts though as possible to get maximum power, right?
Also, can I discharge these batteries fully then just charge them up, or do I have to get a voltage regulator to make sure they don’t go below a certain voltage?
The VESC has a continuous output of 60 ampres , but a max output of 120. I don’t know what that relatively means, is 60 amps enough? I would like to get one to match the motor with 100amps, but I fell like that would be overkill and pointless.
Also, I was planning on only using the BMS to charge the board, not for the output to the motors. With my four Lipo batteries, I would end up with 947.2 watt hours - that should be enough, right? I know it will suck a lot more battery because it has no BMS, but again I’ll probably never use full power as someone who did a similar build made theirs go ~55mph. (although it all depends on the pully ratios and all).
Lastely, I’m not super familiar with how BMS’ work. If I put my batteries in series as mentioned, I’ll end up with 8s (4s per Lipo). Does that mean I have to get a 8s BMS, or will a 10s work? Also, the one. I have below is a 36 volt BMS, will that work or does it have to be the exact voltage (29.6)?
Most of this is dependent on the very first question, if I need 36v to achieve maximum power. If not, them I’m good, but if I do, then I want to try to get as close to that as possible. I don’t want to use 18650’s because I’m not sure how to build them myself and can’t find a good enough pre-built one. Also, these lipos that I have have a much greater discharge rate if needed (for the extra boost).
I hope at least some of the made sense. Thanks for the help in advance.
Motor (I don’t think the stats on this is correct, they are 2900w not 3600.): https://www.amazon.com/gp/product/B07FSVKYQB/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B07DNWKS58&linkCode=as2&tag=skatemetric01-20&linkId=c948d644ccd47683c0e5bfd113972766&th=1&psc=1
Now that I think of it, I do realize that I will never need 100 amores for the motor. 60 ampres should be more than enough. I will then need a BMS, but I could limit it to 60 amores, right?