Here is my current progress. I recently purchased a used ESR750 local here in California. I love the design and how long the deck is. That's what sold me on this scooter.
After a few trips around the neighborhood with my son on his Razor E300, I noticed the batteries would die out around 15 minutes. They are used so understandable, The default motor speed was ok, but I know I want more! So, I started the hunt for battery alternatives to get into lithium batteries for increased range and torque. Seemed like the few options I had were way to costly from the companies that make these for the ESR line. So after a long search online and reading many forums including this one I decided maybe its better to just convert this entire scooter to a full brushless motor system with matching Lithium batteries!
My end goal was to get the speed to 30mph and 10-12 mile total range. The 6374 brushless motor and matching battery pack specs seem to match.
I ordered the parts I needed.
The biggest surprise was the weight reduction. After pulling out the old 4 SLA batteries and 750w motor and replacing both with the new motor and flat battery pack, I lost over 20 pounds on the scooter. Huge reduction! I was amazed.
The new motor is about 40% the size of the old one. I drilled out the hole pattern for the new motor on the existing support bracket.
Battery Info:
Range: 12-15+ Miles (19.3-24+ Km)
Top Speed: 30+Mph (48+ Kmh)
Nominal Voltage: 44.4V
Capacity: 9000mAh
Power: 388.8Wh
Cells: Samsung 30q
Weight: 76oz (2.15Kgs)
Connection: XT60 Female connector
Battery Dimensions:
Length: 13.1" (334mm)
Width: 5.3" (135mm)
Thick: 1.3" (35mm)
________________________________________
Motor KV: 180kv
Model Type: 6374
Motor Wind: 13
Idle current: 1.7A
Motor Resistance: 0.053Ohm
Max. Power: 3250W
ESC: 80-100A
Connectors: 4mm Bullet
Shaft Diameter: 8mm
________________________________________
VESC Controller: BLDC ESC 4.12
Current: 50A continuous / 240A peak
Voltage: 8V-60V (Cells: 3-13S LiPo)
I modified the wood deck to accommodate the new battery pack to be mounted inside and attached under the deck top.
I 3D printed all parts to mount the VESC controller and cable management in the existing bottom tray.
All parts were purchased from mboards.co. I chose this company as they provided all the DIY eSkateboard parts and fantastic response on questions I had. They are located in Nevada. Parts were shipped quick! Very nice.
I had to do a little research on how to setup the VESC controller software with the battery, motor and thumb throttle. Really not bad. About 15 minutes of setting parameters and writing to the controller.
This little monster motor literally sound like a turbine! Its hilarious!
Having such a fun time updating this scooters technology. I had to order a special 15t front gear as the shaft bore diameter on the new motor is 8mm with a set screw.
So far with a few test runs my scoot now hits around 25mph and plenty of torque. Gearing is 15T on the motor, 92T on the rear. I based the rear tooth count on the diameter of the old chain gear. May need to play with it to see the difference in gear ratios.
Belt / Motor spin up test: https://www.youtube.com/watch?v=VDNPziEnWRA
This is still a (work in progress)
After a few trips around the neighborhood with my son on his Razor E300, I noticed the batteries would die out around 15 minutes. They are used so understandable, The default motor speed was ok, but I know I want more! So, I started the hunt for battery alternatives to get into lithium batteries for increased range and torque. Seemed like the few options I had were way to costly from the companies that make these for the ESR line. So after a long search online and reading many forums including this one I decided maybe its better to just convert this entire scooter to a full brushless motor system with matching Lithium batteries!
My end goal was to get the speed to 30mph and 10-12 mile total range. The 6374 brushless motor and matching battery pack specs seem to match.
I ordered the parts I needed.
The biggest surprise was the weight reduction. After pulling out the old 4 SLA batteries and 750w motor and replacing both with the new motor and flat battery pack, I lost over 20 pounds on the scooter. Huge reduction! I was amazed.
The new motor is about 40% the size of the old one. I drilled out the hole pattern for the new motor on the existing support bracket.
Battery Info:
Range: 12-15+ Miles (19.3-24+ Km)
Top Speed: 30+Mph (48+ Kmh)
Nominal Voltage: 44.4V
Capacity: 9000mAh
Power: 388.8Wh
Cells: Samsung 30q
Weight: 76oz (2.15Kgs)
Connection: XT60 Female connector
Battery Dimensions:
Length: 13.1" (334mm)
Width: 5.3" (135mm)
Thick: 1.3" (35mm)
________________________________________
Motor KV: 180kv
Model Type: 6374
Motor Wind: 13
Idle current: 1.7A
Motor Resistance: 0.053Ohm
Max. Power: 3250W
ESC: 80-100A
Connectors: 4mm Bullet
Shaft Diameter: 8mm
________________________________________
VESC Controller: BLDC ESC 4.12
Current: 50A continuous / 240A peak
Voltage: 8V-60V (Cells: 3-13S LiPo)
I modified the wood deck to accommodate the new battery pack to be mounted inside and attached under the deck top.
I 3D printed all parts to mount the VESC controller and cable management in the existing bottom tray.
All parts were purchased from mboards.co. I chose this company as they provided all the DIY eSkateboard parts and fantastic response on questions I had. They are located in Nevada. Parts were shipped quick! Very nice.
I had to do a little research on how to setup the VESC controller software with the battery, motor and thumb throttle. Really not bad. About 15 minutes of setting parameters and writing to the controller.
This little monster motor literally sound like a turbine! Its hilarious!
Having such a fun time updating this scooters technology. I had to order a special 15t front gear as the shaft bore diameter on the new motor is 8mm with a set screw.
So far with a few test runs my scoot now hits around 25mph and plenty of torque. Gearing is 15T on the motor, 92T on the rear. I based the rear tooth count on the diameter of the old chain gear. May need to play with it to see the difference in gear ratios.
Belt / Motor spin up test: https://www.youtube.com/watch?v=VDNPziEnWRA
This is still a (work in progress)
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