KHB - Project eTurd - 2000W - LiFePO4 48V 24Ah

Show off your E-Scooter or Motorcycle creation here.
kreal   1 W

1 W
Posts: 60
Joined: Jan 18 2016 1:52pm

KHB - Project eTurd - 2000W - LiFePO4 48V 24Ah

Post by kreal » Apr 02 2020 9:22am

So I finished my daily driver e-scooter: viewtopic.php?f=12&t=105234 and want a new project.

Welcome to Project eTurd:
C9fo9UA-SpqtlbRP6BR5IA.jpg
C9fo9UA-SpqtlbRP6BR5IA.jpg (429.34 KiB) Viewed 2516 times
I was thinking about using a QSMotor 3000w 13870h chain driven 14T front, 45T back, with 17inch wheels.

The only controller I have right now because of virus and shipping is halted is a generic no name 1500watt, however it goes up to 64v, so might be able to do 23amps!
4e185136c963f589e7dddbe04664a391.jpg_720x720q80.jpg
4e185136c963f589e7dddbe04664a391.jpg_720x720q80.jpg (26.78 KiB) Viewed 2516 times
My goal is to accomplish something like this:
eTurd.jpg
eTurd.jpg (105.78 KiB) Viewed 2516 times
Screenshot 2020-04-02 at 21.21.32.png
Screenshot 2020-04-02 at 21.21.32.png (308.6 KiB) Viewed 2516 times
I will use the back from a Honda MSX, and the front from a Suzuki step 125
Last edited by kreal on Jun 10 2021 2:58pm, edited 9 times in total.


kreal   1 W

1 W
Posts: 60
Joined: Jan 18 2016 1:52pm

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by kreal » Apr 04 2020 12:59pm

What would you suggest to have really good acceleration with the 3000w motor?

14T in front and 65T in back ?

The lead acid batteries I have for this can pump out around 60amps

kreal   1 W

1 W
Posts: 60
Joined: Jan 18 2016 1:52pm

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by kreal » Apr 15 2020 3:33am

Coming along, it is a bit steep angle I manage to make for the front forks, but it might work just fine.

After all, it is project eTurd.
eturd2.jpg
eturd2.jpg (417.66 KiB) Viewed 2370 times


kreal   1 W

1 W
Posts: 60
Joined: Jan 18 2016 1:52pm

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by kreal » May 06 2020 6:56am

Seat mounted, and some lights.
eturd5.jpg
eturd5.jpg (491.45 KiB) Viewed 2178 times
eturd6.jpg
eturd6.jpg (501.44 KiB) Viewed 2178 times

ShadowNightmares   1 W

1 W
Posts: 59
Joined: Nov 24 2019 1:15pm

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by ShadowNightmares » Jun 10 2020 11:46pm

kreal wrote:
Apr 21 2020 5:36am

And motor mounted.
Is that an alternator?

momus3   100 W

100 W
Posts: 104
Joined: May 19 2020 1:48pm

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by momus3 » Jun 25 2020 4:35pm

I think you'd better copyright that name. Might be stolen by some electric commode corporation types.

That's a good looking bike! I've been wanting to do something w/ those 12V 5AH batteries ever since I discovered that you can buy an 8 pack of them (see link below) for under $100, and that's delivered to my door. Might be just the thing for my eTrike project. Good job.
https://www.batterysharks.com/12-Volt-S ... s/1213.htm


ShadowNightmares   1 W

1 W
Posts: 59
Joined: Nov 24 2019 1:15pm

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by ShadowNightmares » Apr 24 2021 12:52am

kreal wrote:
Apr 21 2021 12:04pm
ShadowNightmares wrote:
Jun 10 2020 11:46pm
kreal wrote:
Apr 21 2020 5:36am

And motor mounted.
Is that an alternator?
Yep, converted.
Wow, nice! Do you have videos running with it?
At least spinning it on the controller
Is the alternator coupled to hall or light sensors?

larsb   10 MW

10 MW
Posts: 2192
Joined: Dec 10 2014 5:12am
Location: Gothenburg, Sweden

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by larsb » Apr 24 2021 6:43am

kreal wrote:
Apr 04 2020 12:59pm
What would you suggest to have really good acceleration with the 3000w motor?

14T in front and 65T in back ?

The lead acid batteries I have for this can pump out around 60amps
1:7 is about right for wheel popping acceleration, coupled with a 500A (phase) controller. Those lead acids and that controller won’t do it if you want ”really good acceleration”

Elektrosherpa   100 W

100 W
Posts: 109
Joined: Feb 07 2021 8:19am

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by Elektrosherpa » Apr 24 2021 10:42am

I think you will not have much fun with 5Ah.

Simplified calculation:
3000W/72V -> ~40 A
So with your 5 Ah you can operate the motor at full power for at about 0,125 hours (1/8 of an hour)...
This is 7,5 Minutes, or 450 seconds...

I am also planning to begin with LeadAcid, but at least 20-30 Ah.

larsb   10 MW

10 MW
Posts: 2192
Joined: Dec 10 2014 5:12am
Location: Gothenburg, Sweden

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by larsb » Apr 24 2021 10:58am

Why bother at all with lead acid? It doesn’t have enough performance for this motor which can take +20kW. A 72v 60A 5Ah pack will deliver too little in every way.

If looking for cheap then buy some chinese lipo or even better some used hybrid car cells. Lead acid is never worth it (unless you have unlimited space and weight. On a bike you don’t.)

I’d go as far as to say that the only place for lead acid these days might be in a home energy storage system (if you get the batteries for a very low price.) They don’t belong in EV:s anymore.

kreal   1 W

1 W
Posts: 60
Joined: Jan 18 2016 1:52pm

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by kreal » May 14 2021 1:17pm

Still work in process, I think this might be the final reversion, just don't know if the shock is to steep?
IMG_20210515_005533.jpg
IMG_20210515_005533.jpg (4.75 MiB) Viewed 930 times

Elektrosherpa   100 W

100 W
Posts: 109
Joined: Feb 07 2021 8:19am

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by Elektrosherpa » May 15 2021 4:38am

kreal wrote:
May 14 2021 1:17pm
Still work in process, I think this might be the final reversion, just don't know if the shock is to steep?

IMG_20210515_005533.jpg
Not sure about the angle of the rear shock. But I'd say its upper fixing point is designed too weak.

And in my opinion, the steering angle (front fork to frame) is way too flat...

kreal   1 W

1 W
Posts: 60
Joined: Jan 18 2016 1:52pm

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by kreal » May 15 2021 6:03am

Elektrosherpa wrote:
May 15 2021 4:38am
kreal wrote:
May 14 2021 1:17pm
Still work in process, I think this might be the final reversion, just don't know if the shock is to steep?

IMG_20210515_005533.jpg
Not sure about the angle of the rear shock. But I'd say its upper fixing point is designed too weak.

And in my opinion, the steering angle (front fork to frame) is way too flat...
The rear shock fixing point will be reinforced with bunny ears.
Last edited by kreal on May 16 2021 5:29pm, edited 1 time in total.

kreal   1 W

1 W
Posts: 60
Joined: Jan 18 2016 1:52pm

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by kreal » May 15 2021 3:45pm

Brake caliber added, and adjusted the shock for better angle.

Found a second hand foot brake, even though it's not really needed on a electric bike :)
1.jpg
1.jpg (5.85 MiB) Viewed 862 times
I'm thinking a much larger battery could go here, as I see on many others, as I made plenty of ground clearance.
2.jpg
2.jpg (5.81 MiB) Viewed 862 times
Motor will go here or similar I think.
2.jpg
2.jpg (5.8 MiB) Viewed 861 times
Will most likely use the new one.
New-Arrival-QS138-70H-V3-72V-100kmph-Mid-Drive-Motor-with-1-2-35-gearbox-for.png_.png
New-Arrival-QS138-70H-V3-72V-100kmph-Mid-Drive-Motor-with-1-2-35-gearbox-for.png_.png (485.97 KiB) Viewed 861 times
Also made air intake for cooling in the front.
Screenshot 2021-05-16 at 04.21.15.png
Screenshot 2021-05-16 at 04.21.15.png (1.15 MiB) Viewed 858 times

kreal   1 W

1 W
Posts: 60
Joined: Jan 18 2016 1:52pm

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by kreal » May 16 2021 5:30pm

Elektrosherpa wrote:
May 15 2021 4:38am
kreal wrote:
May 14 2021 1:17pm
Still work in process, I think this might be the final reversion, just don't know if the shock is to steep?

IMG_20210515_005533.jpg
Not sure about the angle of the rear shock. But I'd say its upper fixing point is designed too weak.

And in my opinion, the steering angle (front fork to frame) is way too flat...
Also will be reinforced with seat, like this.
Screenshot 2021-05-17 at 05.30.00.png
Screenshot 2021-05-17 at 05.30.00.png (4.01 MiB) Viewed 805 times

kreal   1 W

1 W
Posts: 60
Joined: Jan 18 2016 1:52pm

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by kreal » May 18 2021 3:17am

Seat welded:
Screenshot 2021-05-18 at 15.12.24.png
Screenshot 2021-05-18 at 15.12.24.png (1.67 MiB) Viewed 769 times
Screenshot 2021-05-18 at 15.20.20.png
Screenshot 2021-05-18 at 15.20.20.png (1.7 MiB) Viewed 769 times

User avatar
stan.distortion   100 W

100 W
Posts: 254
Joined: Jun 12 2019 12:53pm

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by stan.distortion » May 18 2021 6:02am

Interesting build but please bare this in mind for lead-acid:
https://en.wikipedia.org/wiki/Peukert%27s_law
Projects indirectly sponsored by https://www.dash.org/

kreal   1 W

1 W
Posts: 60
Joined: Jan 18 2016 1:52pm

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by kreal » May 18 2021 9:54am

stan.distortion wrote:
May 18 2021 6:02am
Interesting build but please bare this in mind for lead-acid:
https://en.wikipedia.org/wiki/Peukert%27s_law
Thanks, yeah I'm going with LiFePO4 instead, as they should be the safest type, in case I crash in the jungle.

Also I found this motor kit very cheap, the QS motor is to expensive still for this build.
d89d48be23fcdf93ae54cad03e6c747e.jpg_720x720q80.jpeg
d89d48be23fcdf93ae54cad03e6c747e.jpg_720x720q80.jpeg (40.65 KiB) Viewed 744 times
around $130

However I am unsure of the AH I need for battery to support 2000w since motor is rated for 42A

I can get a really good and cheap 48v 12AH ( 16S-2P )
  • Battery LiFePO432650 3.2V 6Ah(6000mAh)
    Charge and discharge standard: constant current and constant voltage (CC/CV)
    Nominal voltage: 3.2V
    Charge upper limit voltage: 3.65V
    Lower discharge voltage: 2.0V
    Nominal capacity: 6000mAh (6AH)
    Measured capacity: 6000mAh or more (6A test)
    Maximum continuous charging: (1C 5A)
    Maximum continuous discharge: (3C 15A)
    Maximum instantaneous discharge: (5C 25A)
    Charging temperature (°C): -20~45
    Discharge temperature (°C): -20~60
    Storage temperature (°C): -20~35
But I guess I might need ( 16S-3P ) for a total of 18Ah to support a continuous discharge of 45 amps ?

kreal   1 W

1 W
Posts: 60
Joined: Jan 18 2016 1:52pm

Re: Project eTurd QSMotor 3000w 13870h - 6x 12v 5ah Lead Acid

Post by kreal » May 18 2021 2:34pm

A little progress:

Moved the hydraulic foot brake to new foot pegs.
Screenshot 2021-05-19 at 02.32.45.png
Screenshot 2021-05-19 at 02.32.45.png (1.43 MiB) Viewed 722 times

kreal   1 W

1 W
Posts: 60
Joined: Jan 18 2016 1:52pm

Re: Project eTurd - 2000W - LiFePO4 48V 24Ah

Post by kreal » May 22 2021 3:32am

Battery ready.

Battery LiFePO432650 3.2V 6Ah(6000mAh)
Maximum continuous discharge: (3C 15A)

16S-4P

This should give me 60A continuous and 100A instantaneous discharge, if my math is correct ?

So plenty of juice for motor at 42A / 48v = 2016watt

Could probably get a better controller and run it at 50A / 2880watt
Screenshot 2021-05-22 at 15.32.22.png
Screenshot 2021-05-22 at 15.32.22.png (1.04 MiB) Viewed 600 times

kreal   1 W

1 W
Posts: 60
Joined: Jan 18 2016 1:52pm

Re: Project eTurd Motocross - 2000W - LiFePO4 48V 24Ah

Post by kreal » May 24 2021 10:05am

Battery box fabricated, half inside frame, half outside.
Screenshot 2021-05-24 at 22.04.05.png
Screenshot 2021-05-24 at 22.04.05.png (1.03 MiB) Viewed 515 times
Also added massive disc brake for front wheel.
Screenshot 2021-05-24 at 22.04.41.png
Screenshot 2021-05-24 at 22.04.41.png (1.54 MiB) Viewed 515 times
Seat also made. Not to sure right not about position, maybe I'll cut the frame shooter.
Screenshot 2021-05-24 at 22.04.59.png
Screenshot 2021-05-24 at 22.04.59.png (1.5 MiB) Viewed 515 times
And new awesome handle bars, found for just $5
Screenshot 2021-05-24 at 22.05.22.png
Screenshot 2021-05-24 at 22.05.22.png (764.43 KiB) Viewed 515 times

kreal   1 W

1 W
Posts: 60
Joined: Jan 18 2016 1:52pm

Re: Project eTurd Motocross - 3000W - LiFePO4 48V 24Ah

Post by kreal » May 26 2021 5:55am

much progress today.

Ready for paint
Screenshot 2021-05-26 at 17.50.56.png
Screenshot 2021-05-26 at 17.50.56.png (808.59 KiB) Viewed 426 times
Screenshot 2021-05-26 at 17.51.03.png
Screenshot 2021-05-26 at 17.51.03.png (846.62 KiB) Viewed 426 times
Screenshot 2021-05-26 at 17.51.08.png
Screenshot 2021-05-26 at 17.51.08.png (741.63 KiB) Viewed 426 times
I found the best color I could for an eTurd.

Also added a bracket for front brake caliber today.
Screenshot 2021-05-26 at 17.49.09.png
Screenshot 2021-05-26 at 17.49.09.png (1.65 MiB) Viewed 426 times
Screenshot 2021-05-26 at 17.49.14.png
Screenshot 2021-05-26 at 17.49.14.png (1.52 MiB) Viewed 426 times
Screenshot 2021-05-26 at 17.49.21.png
Screenshot 2021-05-26 at 17.49.21.png (1.04 MiB) Viewed 426 times
Screenshot 2021-05-26 at 17.49.27.png
Screenshot 2021-05-26 at 17.49.27.png (1.95 MiB) Viewed 426 times
Screenshot 2021-05-26 at 17.49.36.png
Screenshot 2021-05-26 at 17.49.36.png (2.01 MiB) Viewed 426 times
Screenshot 2021-05-26 at 17.49.42.png
Screenshot 2021-05-26 at 17.49.42.png (1.64 MiB) Viewed 426 times
I do think it's going to be very fun to ride.


Post Reply