ST2 ability to torque - how does this work and how helpful is it?

Operator7

Active Member
From another thread:


The biggest difference b/w ST2 and ST1 is the battery and the motor.
814 Whr removes "range anxiety" to certain extent and the 48V motor + the ability to tune Torque, speed is unique.
Can Ravi or anyone else elaborate on how this is done, and/or how well it might help?

thanks!!
 

opimax

Well-Known Member
setting 2 on the new ST2 is user programmable, you make your choices for high speed or torque. The 48v on bike makes it physically available. the battery and the motor are both bigger and more efficient, get more range. I used about 2.5 batteries for on my ST1 platinum to keep up w/Ravi on 1 battery, and I really couldn't keep up.

Details will have to be posted by an owner or look for the manual on line
 

Ravi Kempaiah

Well-Known Member
What Mark said is right.
Assist mode 1 gives you highest range
Assist mode 3 gives you the higher power and speed.

Assist mode 2 is highly tunable. let's say first 15 miles of your commute is flat, you can tune it for more speed and for the 2nd 15 mile stretch (consider hilly terrain), you can tune it for more Torque. This is truly great. Also, the regen is quite effective compared to many other hubs. I have one very long descent in my commute and I stop or slow it down just with regen and normally see 1% increase in battery.

I had a conversation with Endless Sphere moderator recently and he alluded the same i.e., higher the voltage the motor runs at, easier it is on battery. You might find some data on this if you dig Endless Sphere forum. Those guy routinely run their motors at 72V+
 

bluecat

Well-Known Member
... higher the voltage the motor runs at, easier it is on battery. You might find some data on this if you dig Endless Sphere forum. Those guy routinely run their motors at 72V+
Yes, higher voltage gives more power. The reason is, that Ampere is the critical - and therefore limited - value. The ST2 battery might have 54.6V fully charged. If Stromer allows 20A, this leads to over 1000W.
 

Hurley

Active Member
Wattage = Voltage times current. Wattage = Power --For the same current but voltage doubles, so does the wattage.
For our homes we are limited to 30 amps of current. To dry clothes faster they double the voltage to 240 volts because amperage is limited to 30 (due to gauge of wires in homes). Gauge of wire is directly related to how much current it can handle.
For cars with big sub-woofer (1000 watt) amplifiers, sometimes they are forced to go to zero gauge wires because cars only produce about 13 volts. Watts divided by volts = amps. 1000 divided by 13 = 77 amps

The higher the amperage, the more potential for loss in terms of volts across a given wire.
 

Cory151

Active Member
What Mark said is right.
Assist mode 1 gives you highest range
Assist mode 3 gives you the higher power and speed.

Assist mode 2 is highly tunable. let's say first 15 miles of your commute is flat, you can tune it for more speed and for the 2nd 15 mile stretch (consider hilly terrain), you can tune it for more Torque. This is truly great. Also, the regen is quite effective compared to many other hubs. I have one very long descent in my commute and I stop or slow it down just with regen and normally see 1% increase in battery.


I agree with the regen being really good I set mine in settings, so that when i just barely grab the back brake (before the pad contacts the disc) it gives me very good stopping power, with little need for any other braking.

I had a conversation with Endless Sphere moderator recently and he alluded the same i.e., higher the voltage the motor runs at, easier it is on battery. You might find some data on this if you dig Endless Sphere forum. Those guy routinely run their motors at 72V+