I am building an electric skateboard for college this summer and I need some help.
These are the parts I am using: -Turnigy sk3 245KV -Samsung 30Q (and two goups of LG HG2) cells in 10s3p configuration -10s BMS from Mboards.com https://www.mboards.co/collections/diy-supplies/products/10s-bms-battery-management-system -ESC from Mboards.com (comes with remote) https://www.mboards.co/collections/escs/products/single-belt-driven-motor-esc -Caliber II trucks -Abec 11 83mm flywheels -32" cruiser deck -36t wheel pulley -16t motor pulley
I completed my build today only to find that I could barely pick up any speed. I cannot even ride my board up my driveway. I am not using a sensored motor in my build, however it does start without a push. I am thinking maybe the ESC is not able to supply enough current to the motor but I am not sure, I realized after purchasing it that it’s a piece of crap from China. My batteries are soldered together with nickel strips and squished together inside my enclosure. Has anyone had similar problems? Is it my speed controller? Battery? I assume it’s not the motor since many people have reported going 20+ mph with the turnigy sk3 245kv. Also my board pretty much has no braking power. I can get going on flat surface to about 10mph but I can barley stop and I have to jump off the board. I am thinking my speed controller is crap but since I have never done this and Mboards isn’t responding to my emails I’m not sure what the problem is.
DO NOT USE THAT BATTERY.
Dissasemble it right now. That thing is a massive fire waiting to happen.
If you did any research at all you would know that mixing lithium batteries is a catastrophicly bad idea
That speed contoller is not designed to be able to control a motor like that one. This whole build is future bonfire.
I am not trying to be mean, but this is just dangerous. You will burn down your house at some point if you make things like this. Apart from the mixed battery, there is almost no insulation. I see bare wires and uninsulated parralel groups. 1 mistake and you will have another reason it will catch fire.
Also, soldering batteries heats them up to extremely dangerous levels. You shorten their life and you will possibly blow them up when soldering. The lack of safety on this thing is genuinely terrifying. I honestly think its best to dissasemble this and throw away the battery safely.
Just buy a prebuilt and dont burn you house down. I promise at some point this thing will catch fire if you continue using it.
Well where to start? My friend you have done a sterling job of building an electric skateboard with absolutely no knowledge of how to do it. I’m serious. You have got the things together and in the right order but unfortunately the last hurdle had you beat. Never mix cells. Ever. Actually never build a battery until you know exactly what that entails. Take the battery out and carefully disassemble it. Save the 30q cells for later. The rest, well the kv of the motor is too high for anything above 8s. You really want to be running 10s so bad choice. I really think you might be better off getting a meepo for a while and revisit this build once the research needed has been done. You are obviously a capable builder but you don’t have the education you need. Read and learn. You already have the head start. Honestly I have seen worse from guys who have had apparently more experience.
I kind of like it, it works so well done you
But it’s true, you can’t mix cells like that, replace the H2? cell with more 30q and you’re going to have to protect them and all the other bits and pieces
Pretty much every wire in there is chaffing against something else so even if it worked it would have stopped in a matter of time, violently and unexpected or with a pop bang whizzle
And the motor has too much kv
Now off to the esk8 confessional for a drubbing from Father McManer
Where are you based. Can someone give you a hand to disassemble? Everyone has given you the right advice. The danger is real. https://www.smh.com.au/technology/why-hoverboards-around-the-world-are-catching-on-fire-20151217-glphkd.html
Oh and those eBay ESCs come in two different flavors
Double check what you have and if you selected the correct voltage on pcb by soldering the correct pair of pads
Last advice, don’t ever buy from Mboards.
This would probably work better as an 8S3P battery with just the 30Q.
Insulated with fishpaper in such a way to endure extreme vibration.
Ok I get that my battery is a disaster waiting to happen. Apart from extra space in my enclosure between cells though, I’m not sure what I could do much differently. I could insulate a bit more I guess as well. I will disassemble and create something safer. It doesn’t answer my question as to why my board doesn’t go anywhere though. The ESC I bought is definitely a belt drive one and it’s for 10s only. Do I need a better ESC to use this motor? Do I need a different motor?
Because motor is 245kv the ESC might be reaching erpm limit. We usually use up to 190kv on 10s.
Would you suggest buying a VESC, a different motor, or both then?
Both, 245kv is a bit high for your regular vesc you may burn it up. FOCBOX can handle it though.
You want something like 190kv