Cyclone Motor Performance Testing
360 Watt Motor - 20" Folding Bike

Bike:
  Model: Downtube VIII
  Source: E-bay
  Price: Approx. $200
  Tire Size: 20"
  Tire Pressure: 65psi
  Cassette: 8 speed, 11-28
  Bike Weight w/ Batteries: 68 lbs
  Rider Weight: 220 lbs
  Gross Weight: 288 lbs
Motor Kit:
  Model: Cyclone 360 Watt
  Chainwheel: 44 Tooth
  Optional Watt Meter: Watt's-Up
Battery Pack:
  Type: Sealed Lead Acid - Series Wired
  Capacity: 24 Volt 18Ahr
Trip Description:
  Location: Santa Ana River Trail, Orange County, CA
  Elevation: 50' Above sea level average
  Terrain: Level, asphalt bikeway
  Weather: Sunny, Wind 2mph, 71°F
Trip Start Readings:
  Voltage: 26.17
  Amps: 0
  Watts: 0
  V-min: 26.17
  A-max: 0.08
  W-max: 0
  AmpHours: 0
  WattHours: 0
  Battery Temp: 70°F
  Motor Temp: 71°F
  Top Speed: -
  Avg. Speed: -
  Total Distance: 0
Trip End Readings:
  Voltage: 22.41
  Amps: 0
  Watts: 0
  V-min: 18.04
  A-max: 29.76
  W-max: 682
  AmpHours: 14.72
  WattHours: 337.8
  Battery Temp: 75°F
  Motor Temp: 89.2°F
  Top Speed: 19.8mph
  Avg. Speed: 13.8mph
  Total Distance: 22.78 miles
Calculated Values:
  WattHours/Mile: 14.83
  Miles/KWh: 67.44
  Voltage Drop: 3.76
  Actual Whrs vs Rated Whrs: 337.8 vs 432 = 78.19%
  Actual Ahrs vs Rated Ahrs: 14.72 vs 18 = 81.78%
Trip Log:
My objective for this trip was to ride conservatively to see just how far the 360w motor would go when powered by two $20 batteries. The trip was made with very little pedaling - approximately 95% of the time only the motor was use. The Santa Ana River trial is a smooth, fairly level bikeway that is free from automobile traffic and has underpasses where it crosses streets.

As I rode, I experimented with gearing and throttle settings. I quickly found that it is possible to maintain a given speed with several combinations of gearing and motor throttle. After some experimentation I decided to ride at about 14-15mph with the bike in 5th gear (8 gears are available so this is mid-gearing). At this speed the motor is drawing about 10 amps average and the Watt's-Up meter indicates that the motor output is about 250 watts.

On one open stretch of bikeway I decided to see how fast this combination would go under electric power only. I opened the throttle to maximum power and shifted up through the gears. Over about 1/2 mile I finally achieved 19.8mph under motor power only. During this acceleration, the Watt's-Up meter indicated that the current required for acceleration was as high as 29.76 amps and the 360w motor was actually putting out 682 watts. To sustain this high speed would require at least 25 amps of continuous power. At this high current, I believe that the battery life for the SLA's would be quite short.

The Cyclone motor throttle has 3 LED's that indicate an approximate state of charge for the batteries. During the first 6-7 miles of the trip the green light stayed on even during hills and acceleration. From miles 7 through 11, the orange light came on during acceleration and hill climbing. When the orange light came on I noticed no change in performance, the orange LED was only indicating that the voltage was sagging to under about 20 volts. At mile 11 the orange light came on constantly and I reduced my speed to about 11-12mph. Finally at about mile 19 the red LED came on and stayed on indicating that the battery voltage was under 19 volts. Speed was further reduced to about 10-12mph. Even with low voltage, the bike was still going over level ground without pedaling. Finally at 22.78 miles, the voltage dropped under 18.5 and the motor controller cut off. It is designed to cut off at approximately 18.5 volts to protect the motor and controller components.

Conclusions:
Overall I was quite surprised that a pair of $20 batteries would work as well as they did, powering the bike to nearly 23 miles. While the battery pack is heavy at 26 pounds, its low price makes it attractive for use on level ground. I doubt that these batteries would work well to climb steep hills because they do not seem to have the current capacity. I will have to perform some hill test on another ride.
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