Electric Motorcycle

Gearing

The stock gearing on the 1986 Yamaha YX600 Radian is 16-44 with a 530-104 chain. According to the speed/RPM calculator, here are the calculations:

  • Stock tire: 130/90-16"
    • diameter: 25.21"
    • circumference: 79.21"
    • revolutions/mile: 799.92
  • Desired max speed: 70mph @ 4500 RPM
    • wheel RPM for 70mph
      • 800 rev/mi
      • 70 mi/h = 1.17 mi/min
      • 800 rev/mi * 1.17 mi/min = 936 rev/min
      • 4500rpm / 936rpm ~= 1:4.8
    • Using stock driven sprocket
      • Stock rear sprocket: 44
      • New front for stock rear: 9.15 (??)
    • New sprocket ratios
      • Rear sprocket: 60
      • Front sprocket: 13

Batteries

Optima

  • Optima Yellow Top D51 12V 45Ah
  • 6 in series: 72V 45Ah
  • Size: 9.31" x 5.06" x 8.94" = 421 in3
  • Weight: 26 lbs
    • Column
      • Size: 9.31" wide x 33" tall x 8.94" deep = 2747 in3
      • Weight: 156 lbs
  • Price: $750 ($600 after rebates expiring Sep 15)

Odyssey

  • Size: 6.64" x 7.05" x 5.04" = 236 in3
  • Weight: 26 lbs
    • Group
      • Size: 1416 in3
      • Weight: 156 lbs
  • Price: ???

US Battery

  • Size: 10.25" x 7.125" x 10.875" = 794 in3
  • Weight: 69 lbs
    • Total
      • Size: 3790 in3
      • Weight: 621 lbs

LiFePO4 100Ah

  • Cloud EV Lightning Bolt 3.2V 100Ah
  • 15 in series: 48V 100Ah
  • Size: 2" x 6.3" x 11.1" = 140 in3
  • Weight: 7.75 lbs
    • Column
      • Size: 30" x 6.3" x 11.1" = 2,097.9 in3
      • Weight: 116.25 lbs
  • Price: $2,835

LiFePO4 200Ah

  • Cloud EV Lightning Bolt 3.2V 200Ah
  • 15 in series: 48V 200Ah
  • Size: 2.2" x 8.6" x 13" = 245.96 in3
  • Weight: 15.5 lbs
    • Column
      • Size: 33" x 8.6" x 13" = 3689.4 in3
      • Weight: 232.5 lbs
  • Price: $6,735

Parts

  • Frame: Using an existing 1986 Yamaha YX600 Radian I have.
    • free
  • DC Motor & Controller: Separately excited motor for regenerative braking capabilities
  • Batteries: Holds the juice. Obviously needs to be at 72VDC
    • Optima Yellow-Top D51: $125/ea = $750
  • Charger: Mounted on bike to plug-in
  • DC/DC Converter: Supply 12V to on-board electronics
  • E-meter: Monitor battery bank voltage
  • Contactor: Allows the ignition switch to engage the battery to motor.
  • Fuses: Need a heavy duty fuse to keep the bike from frying.
    • ANN 400 w/ holder: $40.
  • Throttle: Control the speed using an electric throttle
  • Sprocket and Chain: Oversized sprocket could cause the chain not to fit.
  • Miscellaneous metal work: New tank top, etc
    • $300

Total projected cost: $3730

References