Picking the Right Stuff (ESC/MOTOR/Battery)

I am interested in making a e-board for my get around on university campus. Theres a big hill that I have to walk up to get to my car lot which is annoying, University is built on a hill slope side. The main paths between buildings are flat but just that hill to the car.

I have made a deck, trucks wheels will be 83mm. I might use the 36 to 15/16 tooth gear.
Am thinking about the 192kv or 247kv sk3. Any advice here?

Also i need some advice what battery packs to pick. I wanna get as much run time as possible, maybe low speeds like 15-20mph but a lot of torque.
I was wondering if it is possible to make a 3 group 5s pack such that its in parallel and series at the same time? I know you can make 2 packs into series and parallel but is that idea scalable to more packs?
Turnigy 5000mAh 5S 25C Lipo Pack $45.57 w/o shipping
RC ZIPPY Flightmax 5000mAh 5S1P 40C $ 64 w/ shipping.
or any other suggestions.

ESC, not sure how to pick this out, I heard it depends on what the max AMPs the batteries can kick out?

Here’s the right stuff based on everything you stated:

192Kv motor (more torque)
14/36 or 15/36 ratio
10s4p lion battery (I recommend buying a custom pack from @barajabali )
VESC from @chaka or ESC from @oriol360
You want it to have long run time - this means it needs to be reliable as well. I’m not saying these parts are cheap and I realize you are likely on a budget but let me just say from the start cutting corners will cost you more in the long run

2 Likes

Specially with the batteries. Charging lipos becomes annoying after awhile. Specially when you have a lot. So it’s better to go with liion from the start.
And 6374 190kv

Yeah I was thinking about going the li-ion route from laptop batteries but then I went towards getting clean 18650’s from aliexpress/alibaba. Then it was expensive after I got quotes. Started leaning towards lipos, but I guess back to li-ion it is.
Cheapest quote so far for 40-50 batteries was by @tumich

I would probably make a 10s4p as suggested, I am still trying to find a 192-190kv

Anyone know if I should get a sk3 192kv ($71) https://hobbyking.com/en_us/turnigy-aerodrive-sk3-6364-213kv-brushless-outrunner-motor.html

or a
6374 190kv ($79) http://www.electric-skateboard.builders/t/56-5065-motor-group-buy-6354-6374/12604

Also noticed that the builders DIY for beginners mentioned the Tacon 110 motor which i’m finding for 70 shipped.

Go for the 6374 group buy - more torque for about the same price

2 Likes

Where do you see the specs if I may ask? I tried on the diy website but all it says is the like connector size…and little more

There aren’t usually specs for torque… I don’t know exactly how that’s measured but believe me it’s noticeable when testing the motor itself. The 6374 is a bigger motor and will be able to propel you up hills much better

1 Like

Planning to make a either 18650 pack with either 10s3p setup or a 26650 with a 6s2p.

Might change from single drive to dual drive. I checked myhills.com or something like that and the hill im trying to go up is steepest 7%. Maybe 2 192kv’s? or 2 236kv’s?

1 Like

What type of C rating should I look for?

I am looking for good deals on battery and so far came up with these 3

6 FLOUREON 11.1V 3000mAh 3S 30C for 90 bucks with shipping
1 Turnigy 2450mAh 3S 30C 11.1V Lipo Pack for 11.30+shipping
1 Turnigy nano-tech 6000mah 4S 25~50C 14.8V Lipo Pack for 47.30+shipping
or
1 MultiStar High Capacity 6S 12000mAh Multi-Rotor 20C PEAK 22.2V Lipo Pack for 63+shipping

I so far know that higher capacity (mAh) = longger ride time based on loading on motor. But I think the motor I am going for the sk3 192kv requires a MAX VOLTAGE of 44V and a MAC CURRENT of 80A.

My assumptions:
~I think my maximum factor would be hitting the 44V mark so I will consider going to roughly 20-35V threshold to not blow up my motor as the max current probably would never reach 80A?

~So I don’t think I would need the multistar in series but could in parallel. but that would be above my $100 limit
~The 6000mAh turnigy 14.8v I could use in either 2 series (29.8V 6000mAh) or 2 parallel (14.8V 12000mAh)
~or the 6 floureon in a (series by parallel): 2by3 (22.2V 9000mAh) or 3by 2 (33.3V 6000mAh)

Any advice? My main goal is to get long rides so I want capacity, but what happens when the motor doesn’t get enough voltage/current? Does it run sluggishly?

I might have gotten a little confusion out of my head by reading the C rating article by onloop

I also read this which states the same as above

44V is the nominal voltage. The SK3 6374 192kv motor is designed for 10 to 12S. 12S is 44.4 V nominal, 50.2 V max. You want to run at higher voltages to minimize current draw. You aren’t going to “blow up” your motor by running it at 12S