Cyclone Motor Performance Testing
360 Watt Motor - 26" Mountain Bike

Bike:
  Model: Montague Hummer
  Source: E-bay
  Price: Approx. $500
  Tire Size: 26"
  Tire Pressure: 65psi
  Cassette: 7 speed, 11-28
  Bike Weight w/ Batteries: 72 lbs
  Rider Weight: 220 lbs
  Gross Weight: 292 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 5-7mph, 72°F
Trip Start Readings:
  Voltage: 25.49
  Amps: 0
  Watts: 0
  V-min: 25.49
  A-max: 0.07
  W-max: 0
  AmpHours: 0
  WattHours: 0
  Battery Temp: 73°F
  Motor Temp: 74°F
  Top Speed: -
  Avg. Speed: -
  Total Distance: 0
Trip End Readings:
  Voltage: 23.01
  Amps: 0
  Watts: 0
  V-min: 17.03
  A-max: 30.35
  W-max: 679.5
  AmpHours: 9.867
  WattHours: 225.2
  Battery Temp: 86°F
  Motor Temp: 92°F
  Top Speed: 31.3mph
  Avg. Speed: 13.9mph
  Total Distance: 14.8 miles
Calculated Values:
  WattHours/Mile: 15.22
  Miles/KWh: 65.72
  Voltage Drop: 2.48
  Actual Whrs vs Rated Whrs: 225.2 vs 432 = 52.13%
  Actual Ahrs vs Rated Ahrs: 9.867 vs 18 = 54.81%
Trip Log:
Once again on this ride, my objective was to see how many miles I could go under electric power without pedaling. For this test the SLA batteries were not fully charged because they had been used the previous afternoon on another test. With the small 1 amp chargers about 18 hours are required for full charging but in this case they were only charged for about 12 hours or so. The partial charge is indicated by the start voltage which was only 25.49 volts (no load) rather than the 26.2 to 26.5 that is normal for a fully charged pack.

Compared to my previous test of the 360 watt motor on a 20" folding bike, I found that lower gears worked better with the 26" mountain bike. Cruising at 12-15mph was possible in 2nd to 4th gears (7 speeds available). Traveling in 3rd gear at about 14mph the motor was requiring 275-325 watts - around 11-12 amps. Under motor power only I achieved about 26.2mph top speed. With motor power and pedaling on a slight downhill I managed to post a top speed of 31.3mph. I'd guess that the cadence is about 90 at this speed - I could not keep this up for very long!

With the 26" mountain bike I frequently saw the orange and even red LED almost from the very start of the trip. This simply indicates that the 26" tire requires more power to turn because of its larger diameter. At about 8 miles, the orange LED came on constantly. After 12.5 miles the red LED was on constantly and I reduced my speed to about 9-10mph to minimize the required current and extend my range a little. Finally at 14.8 miles, the motor controller cut off indicating that the battery voltage had dropped below 18.5 volts.

Conclusions:
While the overall mileage for this trip was disappointingly short at 14.8 miles this is easily explained by the partially charged batteries. What is surprising is to compare the Miles/KWh figure to that of my ride using the same motor/battery combination on the 20" bike. The 20" bike delivered 63.11 M/KWh but the 26" bike bettered that mark with 65.72M/KWh. The M/KWh measurement is like MPH in gas-powered vehicle. Our 24v 18Ahr battery has .432 KWhrs available in theory. If we assume that we can get 80% of that in reality (.3456KWh) this battery/motor combination should be capable of about 22.7 miles with this setup. This is almost exactly the range we did achieve with the same motor/battery combination on the 20" bike.

Again I was surprised at how well these inexpensive SLA batteries did in powering the bike over level ground. As with the 20" bike and this setup, I think it is adequate on the level but would not perform very well in hilly terrain.
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