Hub Motor Controller Options & Effects

[E-Moto Tuner]

I have a e-motorcycle 17" x 3.5mm 2000w hub motor with 40h magnets and am wondering what to match it up with for a Controller. I have 3 options :

1) 2000w 55a and low voltage cutoff 40v
2) 2500w 65a and lv cutoff 40v
3) 3000w 80a and lv cutoff 40v

Motor is rated at a top speed range of 60-75kph and I'd like to get the fastest speed.

 

[amberwolf]

I have a e-motorcycle 17" x 3.5mm 2000w hub motor with 40h magnets and am wondering what to match it up with for a Controller. I have 3 options :

1) 2000w 55a and low voltage cutoff 40v
2) 2500w 65a and lv cutoff 40v
3) 3000w 80a and lv cutoff 40v

Motor is rated at a top speed range of 60-75kph and I'd like to get the fastest speed.

Under what riding conditions and terrain and winds? Including what kind of acceleration do you want under those conditions? What kind of total weight of system, rider, etc?

What battery do you have? What are it's limitations and specifications?

You'll need to know those to determine how big your controller has to be to do the job you need the bike to do for you, and whether your battery can handle that job or if ti has to be replaced (or if you haven't bought one yet, how big and how good a battery you will need to buy).

You can experiment with the http://ebikes.ca/tools/simulator.html to see how this stuff works in general, and can use it to determine how much power you'll need from motor, controller, battery, to do the job you're after.

 

[E-Moto Tuner]

Mostly level roads, dry, minimal wind. Total weight including batteries (12v 20ah x 6) is 250lbs

I'm hoping to get 70-75kph on the flats.

What effect will the 3 different controller options have? I'm thinking the higher amp one will give more torque but draw more on the batteries. Maybe the middle option of 2500w 65a controller will get a good trade off of speed and torque? I've heard these chinese hub motors are underrated and can handle 2500-3000w for a 2000w motor like the one I have.