I have an Xtreme rubicon 36v 350 rear hub motor. My question is: what should the display wattage read at verious levels of assist? 5 levels available, level 1 reads 25-28 constant, no change when pedaling. Level 2 sometimes goes to 50-51, constant. Level 3, 4 & 5 the wattage levels keep changing depending on the amount of pedaling. If I slip the chain off the chainring and crank by hand I get the same result with minimal assist at the wheel. I can not notice any assist at levels 1 & 2 when riding, but definitly at levels 3 and above. I have been going around in circles with Allco Manufact. for months now. They have replaced the controller and display but this did not correct the problem. Sent the back to them($125), they said it was the battery, sent it back to me. Can't tell if it is a new battery, but the problem is the same. Display reads the same. Does this sem correct. Any input would be helpful.
Wattage display
- Thread starter frossa
- Start date
Trail Cruiser
Well-Known Member
Your controller is working as intended. Most ebike controllers for rear hub motors with cadence-only sensor uses "amperage" throttling. Each assist level is assigned a fixed throttle value (producing relatively fixed wattage at the display). At the highest assist level, many controllers allow almost full battery discharge rate, so the wattage display at full assist varies with the battery's health and state of charge. It will also be the quickest way of depleting your battery.
However the wattage on the display does not reflect the power on the hub motor, it only shows how much power is fed into the motor. The motor has a peak efficiency in the low 80%, however at lower speeds, the efficiency drops and the lost wattage is just converted to heat. So high power and low speed is a recipe for overheating.
The throttling can also be modulated by voltage (such as used by Grin Technologies) or by torque via field-oriented-control (FOC) which is commonly used by high powered electric transportation, also offered by grin technologies (phaserunner controller).
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rich c
Well-Known Member
That can't be showing watts, unless it drops off a zero. A 350 watt motor can draw more than 500 peak watts. It will never draw only 25-28. We would need to know the controller size in amps to calculate further.
http://www.ebikeschool.com/myth-ebike-wattage/
http://www.ebikeschool.com/myth-ebike-wattage/
Trail Cruiser
Well-Known Member
X-Treme Rubicon 36 Volt Electric Mountain Bike spec sheet
http://www.advancedelectricscooters...les/36-volt-electric-bicycles/rubicon-36-volt
Controller: 36 Volt 15 Amp Waterproof Smart Controller
36V x 15 amps = 540 electrical peak watts from the battery less 18% efficiency loss = ~440 mechanical peak watts motor output.
Speed: 23 MPH On Throttle Only (Faster If You Pedal Assist), -- This is most likely tested by a light weight Chinese rider (~120 pounds), a heavier rider will have lower speed.
Amps:10 AMP Circuit
Volts: 36 Volts
Battery Type: Lightweight LiFePo4 Lithium Batteries In A Sealed Removable Pack
The whole electrical system is rated 10 amps (10A x 36v = 360 electrical watts system).
The battery capacity is also rated at 10 amp hour, x 36 volts = 360 watt-hours.
"The Rubicon 36 Volt Mountain Bicycle has a top speed of 23 MPH (faster if you pedal) which is faster than any model we sell and will go the distance of up to 25 miles using power only and up to 35 miles "
If your ebike can achieve the weight-adjusted top speed (at full throttle) and range (at assist level 1), then you should be OK and you don't have to worry too much about the aberrances on the display. Otherwise, I would look at the battery first before checking the motor.
The high mileage can only be achieved using the lowest assist level, and most likely the number is based on a lightweight rider. A heavier rider will certainly have lesser range (probably lower 20's with pedalling). The motor power is also very low at level 1 to maximize range.
http://www.advancedelectricscooters...les/36-volt-electric-bicycles/rubicon-36-volt
Controller: 36 Volt 15 Amp Waterproof Smart Controller
36V x 15 amps = 540 electrical peak watts from the battery less 18% efficiency loss = ~440 mechanical peak watts motor output.
Speed: 23 MPH On Throttle Only (Faster If You Pedal Assist), -- This is most likely tested by a light weight Chinese rider (~120 pounds), a heavier rider will have lower speed.
Amps:10 AMP Circuit
Volts: 36 Volts
Battery Type: Lightweight LiFePo4 Lithium Batteries In A Sealed Removable Pack
The whole electrical system is rated 10 amps (10A x 36v = 360 electrical watts system).
The battery capacity is also rated at 10 amp hour, x 36 volts = 360 watt-hours.
"The Rubicon 36 Volt Mountain Bicycle has a top speed of 23 MPH (faster if you pedal) which is faster than any model we sell and will go the distance of up to 25 miles using power only and up to 35 miles "
If your ebike can achieve the weight-adjusted top speed (at full throttle) and range (at assist level 1), then you should be OK and you don't have to worry too much about the aberrances on the display. Otherwise, I would look at the battery first before checking the motor.
The high mileage can only be achieved using the lowest assist level, and most likely the number is based on a lightweight rider. A heavier rider will certainly have lesser range (probably lower 20's with pedalling). The motor power is also very low at level 1 to maximize range.
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