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Would these component deliver?

battery
vesc
electric-skateboard
motor

#1

Hi everyone. I’ve been reading and reading, and now I have some questions, and I would also like a final word on my choice of components. I would like to know if these components can deliver a real world performance of approx. 30-35km/h, as well as nice torque.

My components:
Motor: Turnigy SK3 245kv
Batteries: Turnigy 4S 5000 mAh 25C (2x)
ESC: Probably the VESC, but other suggestions would be great
Receiver: Not decided yet, but should not have an impact on performance.
Gearing: Motor pulley teeth: 15t, wheel pulley teeth: 32t
Mount: Probably Enertion’s mount, or a DIY copy.
Wheels: 83mm

Questions:
Is 25C discharge rate too high (or too low)?
If I go with 8000mAh, should I lower the discharge rate (or increase)?
Should I go for 2x 6S instead, for this motor? Or what’s the preferred combination of motor+battery without too many S’s?

I tried understanding the “C” thread as much as possible, but these are still my concerns.
Any other suggestions are very welcome as this is my first build.
Thanks a lot in advance, fraannk


#2

25c is just fine. if u get 8000mah then keep 25c dont chage it unless u go up
Edit: the vesc is still in the prototype phase so if u get it id run it on 8s for longevity. Finally get a gt2b rc controller 2.4 ghz


#3

Basically the C rating is how many amps the battery can output. SO a 25c 5000 mah lipo can output a max of 125amps which is perfect.


#4

And if I go 8000mAh, it will be 200 amps, and won’t that be too much?


#5

no it will still be fine u should be more worried about ur voltage the lower it is the more power u will need to draw and the easier it is to overheat components


#6

Okay, I might go 8S then, to get a bit more voltage. :slight_smile: Is 245kv on the motor too much? should I get the 213kv or 192kv?


#7

whats ur weight?
20 characters


#8

I weigh about 72kg. I would like about 30-35km/h, and a fair bit of torque


#9

i think ud be fine even if you were going up hills 190 is considered a safe zone and garunteed to basically work for everyone.


#10

So would you prefer the 190 or 245?
Thanks, you’re being really helpful :smiley:


#11

i weigh 120 and ur not a hevy weight urself so id suggest 245 so u can also get a bit more speed and no problem bro


#12

Fantastic! So 245kv motor, 2x 4S batteries, and 15T, 32T enertion gear/mounting stuff would make a great functioning board then? This is my very first build, so I just want to make sure.


#13

haha we all worry on our first build. However to help u build the best board for uself i need u to give me ur budget and what u want to use it for


#14

I’m thinking 500 euros max for the electronics and mounting stuff. Longboard and maybe trucks/wheels etc should be excluded in the budget :slight_smile:
and I would use it to travel about 5km to work every day


#15

alright then so i will recommend the 149 kv sk3 as all other motors are out of stock rn plus the 149kv has an insane amount of torque and is basically garunteed to work.


#16

And I would still get 30-35km/h top speed? Don’t mind about stock, since nothing is in stock in the EU warehouses…


#17

oh yea on 10s with 15 by 32 tooth gearing that will be great


#18

Okay thanks, I’ll take a look at it!


#19

use this calculator to run speed tests


#20

Yeah, already looking at that. After going through different combinations with 8S (since I would like to stay there), it seems the sweet spot would be the 192kv 6374, no? I’m thinking either that one or the 245 to get the top speed I want, or am I wrong? :slight_smile:
Edit: And also according to this thread: Choosing the right motor kv for the VESC it seems either the 192 or 245 would be the sweet spot for 8s? :slight_smile:

Edit: No more posts for me today :frowning: If you see this, I would like to stay at 8s because i think 10s might be a little overkill for me… Also because of the prototype VESC as you stated in post 1 :slight_smile: