Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

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garolittle   100 W

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Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by garolittle » Aug 10 2018 9:29pm

All,

I have been lurking and learning for the past several months and I need your help on a major purchasing decision. I am considering purchasing the following motor and charge controller for my electric go kart project.

Motor: 72V Motenergy Brushless Motor (ME0201014201).

https://www.amazon.com/Motenergy-ME-020 ... dpSrc=srch

Charge Controller: Sabvoton (svmc72150)

https://www.amazon.com/QSMOTOR-SVMC7215 ... +svmc72150

Would this motor/charge controller set up allow me to reach my goals of quick acceleration with a max speed on level ground of 55 mph (88 kph)?

Here is the background information:

In the coming weeks, I will be building/testing the following lithium ion battery pack to power the go kart:

Using Brand new Samsung INR18650-25R cells (20Amps maximum continuous discharge), I will have two separate 20S10P packs connected in parallel to obtain 72 volts. Wiring to/from the battery pack, controller and moter will be 4 AWG copper wire.

Even more information.....
Rider weight: 150 pounds (68 Kilograms)
Kart Weight: 100 pounds (45 Kilograms)
Motor/Charge controller Weight: 30 pounds (13 Kilograms)
Battery pack weight: 40 pounds (18 Kilograms)
Chain: #35
Sproket Size: To be determined
Brake type: Disc
Desired max range: 25-30 minutes at average of 30 mph (48 kph)
Terrain: mostly flat, some short hills under 5% grade

See the following pictures of the frame showing placement of each 20S10P 18650 battery pack as well as the tires I plan to use. Thanks for any advice/suggestions/criticism you can offer:
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garolittle   100 W

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Re: Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by garolittle » Aug 12 2018 8:03am

Here are a few more photos of the frame I purchased for my project. This is a pre-owned "Razor" chassis was previously used for gas powered racing. The prio owner claimed to have reached speeds in excess of 70 mph (112 kph) so it should be sturdy enough for my goal of 55 mph (88 kph).

Any feedback on my plans for a Motenergy motor and Sabvoton controller is welcome. I have also considered purchasing an Alltrax controller within the same price range of the Sabvoton.
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garolittle   100 W

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Re: Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by garolittle » Aug 16 2018 6:00pm

Ok I will offer a free ride in my super cool go kart to anyone with advice. :lol:

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Re: Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by 999zip999 » Aug 18 2018 2:09pm

Looks Qsmotor or Vito they have a lot of high power stuff. He has a thread in the for sale new section. I do believe they have good support . It should fly. In a cart you can use leaf style battery modules

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garolittle   100 W

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Re: Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by garolittle » Aug 18 2018 9:40pm

999zip999 wrote:
Aug 18 2018 2:09pm
Looks Qsmotor or Vito they have a lot of high power stuff. He has a thread in the for sale new section. I do believe they have good support . It should fly. In a cart you can use leaf style battery modules
Thanks. I checked out the websites and they have some cool stuff. Have you heard of Electromotorsport? They have some motor kits that look interesting....

https://www.electricmotorsport.com/ev-p ... drive-kits

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Re: Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by 999zip999 » Aug 19 2018 1:08pm

That's some serious stuff I'm scared.

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garolittle   100 W

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Re: Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by garolittle » Aug 19 2018 10:19pm

I am starting to think that a 48v motor/charge controller with 150 continuous amps (300 max amps) would suffice.

A 14S 10P pack (on each side of the kart connected in Parallel) would give me 52V (nominal) and 58V (max). Such an arrangement would easily fit within the spaces below ....
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2E7DD546-7E24-49FE-B706-C7B496D52409.jpeg (150.47 KiB) Viewed 506 times
It would also be much cheaper since I would need fewer 18650 cells. :D

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garolittle   100 W

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Re: Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by garolittle » Aug 26 2018 11:04pm

I appreciate all the advice from this post and from private messages. I am now leaning heavily toward this motor/charge controller/wiring package from "Electric Motorsports" in CA.

https://www.electricmotorsport.com/ev-p ... k-928.html

The relative safety of 48V over 72V has been a big factor for me. If anyone has any final suggestions for before I pull out my worn-out check book :D , feel free to reply or send a PM. Thanks again for everyone's help. Long live ES!

Gary

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Re: Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by Upperfoot » Aug 27 2018 5:08am

I would recommend higher voltages because its easier to get more volts into a system than more amps (weight and heat constraints). The performance is normally greater, and you dont have to go as heavy duty with the wiring.

72v x 300A = 48v x 450A = 21600w

Here is a bit of discussion over it and safety of voltages viewtopic.php?t=75636

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garolittle   100 W

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Re: Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by garolittle » Aug 27 2018 7:44am

Upperfoot wrote:
Aug 27 2018 5:08am

Here is a bit of discussion over it and safety of voltages viewtopic.php?t=75636
Great article. Thanks for sharing that. This is been a difficult decision for me. I cannot tell you the number of times I have been on a website like electricmotorsports.com and toggled between the 48 V and 72v motenergy Motor/Charge Controllers.

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Re: Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by nieles » Aug 27 2018 8:41am

get the zero motor drivetrain!!! :mrgreen: :mrgreen: :mrgreen:

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garolittle   100 W

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Re: Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by garolittle » Aug 29 2018 8:41pm

Ok. I think I will go with this set up.

https://www.electricmotorsport.com/ev-p ... k-929.html

48v motor/charge controller with 150 amps continuous (300 amps max). Time to start buying stuff. Really appreciate all the great advice from everyone.

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Re: Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by ElectricTraveler » Aug 31 2018 4:01pm

My son and I went with this package. http://www.evdrives.com/product_p/ck-0708.htm
We used a 14S Nissan Leaf pack (7 modules in series) with no BMS. With my son's weight and the proper sprocket selection you can hit 55mph easily. Since we are not running a BMS we are instead monitoring the battery voltages to ensure balance, and we do not run the voltage too low.

Still working out the bugs, but it is a blast!

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garolittle   100 W

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Re: Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by garolittle » Aug 31 2018 8:25pm

ElectricTraveler wrote:
Aug 31 2018 4:01pm
My son and I went with this package. http://www.evdrives.com/product_p/ck-0708.htm
We used a 14S Nissan Leaf pack (7 modules in series) with no BMS. With my son's weight and the proper sprocket selection you can hit 55mph easily. Since we are not running a BMS we are instead monitoring the battery voltages to ensure balance, and we do not run the voltage too low.

Still working out the bugs, but it is a blast!
Nice! Can you share some pictures? What size wheels and sprockets do you have. Any additional information is much appreciated.

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garolittle   100 W

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Re: Help me decide: Motor/Charge Controller for 55-MPH Go Kart (PICS)

Post by garolittle » Aug 31 2018 8:27pm

Also, what is your continuous and max amps? What size wiring are you using?

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