aaron_mason
100 mW
- Joined
- Sep 13, 2018
- Messages
- 35
Hey guys,
I'm in the process of converting an old Vespa over to electric, and I'm building a battery pack. My motor is a Kelly hub rated for 6KW at 72V, and the literature says it'll push over 8KW pulling 125A at 66V. The controller will handle 8KW at 24-84V, and up to 300A I think.
My battery pack, on the other hand, is small. I've just bought 80 Samsung 25Rs that are good for 20A. My initial plan was to build a 20s4p pack, and have 72V at 80A. However, after looking at the world of BMS options, and finding none at 72V that I have much faith in, I'm considering switching to a 15s or 16s setup.
I'm not planning on this scooter going fast - 40mph tops would be fine. What I am interested in is torque - I live in San Francisco and I'd like to be able to punch it up steep hills and not feel like the bike is struggling.
So my question is, if I'm delivering the same amount of power to the motor, will I see a difference running at 60v instead of 72v? Are there advantages to either (other than top speed)? And do you have any recommendations for a smart BMS to use?
Also, are there any other threads that tackle this, so I don't go asking a million previously-answered questions?
Thanks in advance!
I'm in the process of converting an old Vespa over to electric, and I'm building a battery pack. My motor is a Kelly hub rated for 6KW at 72V, and the literature says it'll push over 8KW pulling 125A at 66V. The controller will handle 8KW at 24-84V, and up to 300A I think.
My battery pack, on the other hand, is small. I've just bought 80 Samsung 25Rs that are good for 20A. My initial plan was to build a 20s4p pack, and have 72V at 80A. However, after looking at the world of BMS options, and finding none at 72V that I have much faith in, I'm considering switching to a 15s or 16s setup.
I'm not planning on this scooter going fast - 40mph tops would be fine. What I am interested in is torque - I live in San Francisco and I'd like to be able to punch it up steep hills and not feel like the bike is struggling.
So my question is, if I'm delivering the same amount of power to the motor, will I see a difference running at 60v instead of 72v? Are there advantages to either (other than top speed)? And do you have any recommendations for a smart BMS to use?
Also, are there any other threads that tackle this, so I don't go asking a million previously-answered questions?
Thanks in advance!