Choudhary
10 mW
- Joined
- Sep 11, 2016
- Messages
- 33
Namaste. I am from India & have been working on ebikes for sometime. I was using MXUS (Chinese) geared hub motors (250 watts) in my bikes & was happy with them but they were expensive for Indian market. I visited Shanghai Cycle fair to get more understanding of ebike technology & spent some time there. I feel that Chinese ebike market is quite evolved and most motors have a reliable life of around 3 years (any info on this?).
Following are the requirements & conditions where these bikes will be running.
1. Range 50km. Max Speed 25kmph
2. Mostly flat (except flyovers)
3. Indian weather is hot most of the time. So pedalling is only an emergency / leisurely option & bike will be running on throttle most of the time.
4. Just like China, the bike will often carry 2 people (150kg)
While using MXUS 250 watt geared motor with 36v 7.8ah, I was getting 35-40km range (varrying on traffic) & around 25km with 6.6ah, which i think is great.
With a new Direct Drive motor (an option that my vendor supplies), I am supposed to get 50km range on 48v 10ah. This increases my battery cost by a big percentage. But there is one feature in DD that I absolutely love, that is, automatic anti theft lock / alarm.
My questions are, given the requirements & conditions where the bike will be used
1. Should I go for 36v setup or 48v? (although India has a limit of 250watts for exempting electric 2 wheelers, most run on 48v 20amp controllers)
2. what difference in battery capacity should I expect for 50km range for the two kind of motors?
3. I understand geared motors have higher torque (higher initial acc. & better climbing for same wattage), slightly higher noise, possibility of wearing out gears sooner than DD. But is there a major performance difference that I am missing and becomes important in Indian context (or my usage)?
Few comparison:
Geared Motor vs Direct Drive Motor
Company - Mxus || Local Manufacturer
Price - 55 usd || 32 usd
Warranty - 2 years || 1 year
Weight - 2.8kg || 4.5kg
Voltage - 36v || 48v
Inclines - Slows down a while climbing flyovers (comes down to 20kmph) || Does not slow down
Controller amperage - 7amp to 14amp || 10amp to 13amp (this is a little hard for me to digest. they say the motor is 240 watt. How :? )
Attached is the pic of the bike I am working on now. Any suggestions & piece of info are welcome.
Edit - couldn't get the image to show up. You can check it here http://imgur.com/a/srMcB
Following are the requirements & conditions where these bikes will be running.
1. Range 50km. Max Speed 25kmph
2. Mostly flat (except flyovers)
3. Indian weather is hot most of the time. So pedalling is only an emergency / leisurely option & bike will be running on throttle most of the time.
4. Just like China, the bike will often carry 2 people (150kg)
While using MXUS 250 watt geared motor with 36v 7.8ah, I was getting 35-40km range (varrying on traffic) & around 25km with 6.6ah, which i think is great.
With a new Direct Drive motor (an option that my vendor supplies), I am supposed to get 50km range on 48v 10ah. This increases my battery cost by a big percentage. But there is one feature in DD that I absolutely love, that is, automatic anti theft lock / alarm.
My questions are, given the requirements & conditions where the bike will be used
1. Should I go for 36v setup or 48v? (although India has a limit of 250watts for exempting electric 2 wheelers, most run on 48v 20amp controllers)
2. what difference in battery capacity should I expect for 50km range for the two kind of motors?
3. I understand geared motors have higher torque (higher initial acc. & better climbing for same wattage), slightly higher noise, possibility of wearing out gears sooner than DD. But is there a major performance difference that I am missing and becomes important in Indian context (or my usage)?
Few comparison:
Geared Motor vs Direct Drive Motor
Company - Mxus || Local Manufacturer
Price - 55 usd || 32 usd
Warranty - 2 years || 1 year
Weight - 2.8kg || 4.5kg
Voltage - 36v || 48v
Inclines - Slows down a while climbing flyovers (comes down to 20kmph) || Does not slow down
Controller amperage - 7amp to 14amp || 10amp to 13amp (this is a little hard for me to digest. they say the motor is 240 watt. How :? )
Attached is the pic of the bike I am working on now. Any suggestions & piece of info are welcome.
Edit - couldn't get the image to show up. You can check it here http://imgur.com/a/srMcB