Building An Electric Streetfighter Motorcycle - Complete Build & Test Ride!

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James Biggar
Published at : 22 Jan 2021
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In this video I build a custom electric streetfighter motorcycle. Plans for this project are available at the following link: https://www.resystech.com/electric-streetfighter.html

This aggressive looking streetfighter uses the same 24 kW (32 hp) drive train as the previous Cyber Trike project. Though equivalent to most 300cc street bikes in overall power, this little monster boasts a massive 250 ft-lb of max starting torque and over 100 ft-lb of mid-range torque, and only weighs 300 lbs. Top speed is limited to 115-150 kph depending on the system voltage, but it boasts more torque than most 1000cc bikes to produce white knuckle acceleration at legal speeds, so you can still have fun without the risk of getting a speeding ticket, or worse. In fact, unless you're a pro rider with great throttle control on one wheel then you'll probably want to use the controller program to lower the torque to 25-50% for the first few rides.

Specs and links for electrical components can be found below.

Bike specs:
Power: 12 kw/ 24 kWp, 32 hp gross
Motor: QS273 70H brushless hub motor
Battery: 74V/4.3 kWh Li-Po
Range: up to 100 km's
Top speed: ~115 kph (71 mph) @ 72V, 150 kph (93 mph) @ 120V
Max torque: 350 Nm (258 ft-lb)
Controller: Kelly KLS72601
Wheelbase: 55" (140 cm)
Rake angle: 26°
Trail: 4.9" (124.5 mm)
Turning radius: 72" (183 cm)
Weight: 300 lb (136 kg)
Front suspension travel: 5" (130 mm)
Rear suspension travel: 8" (203 mm)
Front tire: 120/70-17 Shinko 705
Rear tire: 180/55-17 Metzler Karoo Street

Electrical components:

72V motor
https://www.qsmotor.com/product/17-inch-12kw-hub-motor/

KLS72501 controller
https://www.kellycontroller.com/shop/kls-8080h/

72V/400A contactor
https://www.kellycontroller.com/shop/kzj-400a/

LiPoFe4 cells
https://liitokalahongkong.aliexpress.com/store/group/LiFePo4-Lipo-3-2V-Batteries/217753_517543258.html?

24S (72V) LiFePo4 BMS
https://www.aliexpress.com/item/32851397187.html?

72V-12V Converter
https://www.ebay.com/itm/Pro-Chaser-DC-DC-48V-60V-72V-Converter-Regulator-Step-Down-to-12V-120W-10A-/223130933726

12V horn
https://www.ebay.com/itm/12V-Loud-105db-Motorcycle-Car-Electric-Bike-ATV-Horn-replacement-with-Bracket-US/193074643965?

12V turn indicators
https://www.ebay.com/itm/12v-Flowing-LED-Motorcycle-Turn-Signal-Indicators-Blinkers-Amber-Light-Scooter/312746782364?

12V/18W LED bar lights
https://www.ebay.com/itm/LED-Work-Light-Bar-Spot-Flood-Roof-Lights-Driving-Lamp-Offroad-Car-SUV-ATV-18W/313191449785?

12V LED brake light
https://www.ebay.com/itm/2x-Bendable-2835-SMD-Red-Amber-17-LED-Strip-Lights-Tail-Turn-Signal-Brake-Lamp/222206388002?

Sicass Racing handlebar switch
https://www.ebay.com/itm/Sicass-Racing-Multi-Function-Handlebar-Switch-26-042/324309545679?

Music: 'Dark Epic Hybrid Rock' by Pegasus Music Studio
https://audiojungle.net/item/dark-epic-hybrid-rock/28838847

ROI breakdown:
Cost of electric bike build = ~$5000 total
Nominal battery capacity = 4.3 kWh
Life span of LiFePo4 cells = 3000-5000 cycles
Range per charge = ~80km @ 80% DOD (up to 100 km @ 100% DOD)
Grid energy cost = $0.12/kWh
Cost per charge (100 km) = 0.12 * 4.3 = $0.52
Cost per km for energy = 0.52 / 100 = $0.005

Avg price of gasoline in Canada = ~$1.00/ liter
Energy in 1L of gasoline = 8.9 kWh
Fuel economy of the most efficient petrol bikes = ~60 miles per gallon, or 25.5 km per liter
Cost per km for fuel = 1 / 25.5 = $0.04

Electric bike energy cost savings per km = $0.04 - $0.005 = $0.035
Savings per charge/cycle (80 km) = $0.035 * 80 km = $2.80
Payback period based on full cycle charges = $5000 / $2.80 =
1785 cycles

OR
Savings per day based on driving an avg 40 km per day as a daily commuter = $2.80 / 2 = $1.40
Payback period = $5000 / $1.40 = 3572 days, or 10 years. 5 years if driven 80 km per day.

It's clear to see that an electric bike like this is a sound investment for nearly anyone who can build and ride (provided laws in your area allow it). Based on battery cycles - which is the most important thing because it will need to be replaced eventually and it is the most expensive component by far - this bike will pay for itself entirely nearly twice in fuel cost savings before the battery needs to be replaced, provided that it's maintained and charged properly (ie don't discharge below 80% DOD, don't store, operate or charge above or below the manufacturer's recommended temp., etc).

Most people only travel an avg of 45 km's per day back and forth to work or school, so as a daily commuter a person can expect a bike like this to pay for itself in 10 years or less. But the great thing is, the more you drive it, the shorter the payback period. Those who travel farther will get a better return on their investment.

RST Website: https://www.resystech.com

Support RST on Patreon or Youtube and earn membership perks:

http://www.patreon.com/resystech
https://www.youtube.com/channel/UCtrf6ZiE6hw3k77hGpnuQWg/join

Follow RST on Facebook:
https://www.facebook.com/RenewableSystemsTechnology
electric motorbikeelectric motorcyclemotorbike

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