Scooter 2
OwnerKeith Payne
LocationDunedin, Otago New Zealand map
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Vehicle2006 Gee Bykes
The scooter started it's life as a horribly underpowered 500W
scooter made by Gee Bykes.
MotorGolden Motors like a MW16C from Golden Motors Brushless DC
Surprisingly loud for a hub motor, running it at approx 3kW,
rather than its rated 2kW, only gets a little warm after a long
uphill stretch.
DrivetrainRear Hub motor
ControllerKelly KEB72331
Originally used the Kelly KEB48221, but decided to up the
voltage to 60V for higher top speed. Works well, and easy to
configure. Regen works well.
Batteries12 6V, 12Ahr, 6.00 Volt, Lead-Acid, Gel
20 6v 12Ahr cells from Jaycar set up as a 10s2p pack.
Arranged to fill all available gaps in the scooter.
System Voltage60 Volts
Charger
Currently use a cheap 3 Amp charger from Ebay - overnight
charging at home only.
An onboard 7 Amp switch mode charger with cell balancing
is under development.
DC/DC Converter Lineage power QBW018A0B
Digikey part number 555-1109-ND
InstrumentationCurrently none, even the speedo and odometer are broken,
plans for a fancy dual graphical LCD display though.
Top Speed34 MPH (54 KPH)
Running at 48V it topped out at 43.2km/hr, so we
changed it to 60V now the top speed is about 54km/hr.
Plenty around town, handles the hills pretty well too,
certainly better than 50cc scooters.
Acceleration0-30km/hr in 6 seconds
0-50km/hr in 11 seconds

0-5km/hr is pretty weak, but after that it seems to hit a
good power band and feels good!
Range16 Miles (25 Kilometers)
25km over hilly terrain, probably more like 40 on the flat.
(one rider only)
EV Miles
Start:9 Miles (14 Kilometers)
Current:1,000 Miles (1,609 Kilometers)
Total:991 Miles (1,594 Kilometers)
Seating Capacity2 people, fine on the flat, but then it struggles with steeper
hills.
Curb Weight260 Pounds (118 Kilograms)
Rear wheel 71kg, front wheel 47kg
Not a light construction at all, all the plastic bits alone weigh
20kg!
The batteries weigh in at almost 45 kg!
TiresStandard scooter tyres
Conversion TimeAbout 4 months.
Conversion CostApprox NZ$1600 - more than a new petrol scooter, but not
too bad for an electric one.
Initially I had intended on using lithium polymer batteries, but given the weight of the
scooter, there seemed little point using light weight batteries.
The controller and motor that came with the scooter are used by a friend for his sons'
gokart. The only major electrical part that I was using from the original scooter was the
DC/DC converter, but that died in spectacular fashion during regen at night with two
people after I upped the voltage to 60V. The input and output fused internally and due
to the lack of fuse in the original Chinese construction all the lights blew (some bulbs
actually exploded!)

If I was doing it again, I would find a much better/smaller/lighter scooter to start with,
use a higher quality (quieter) hub motor which could do 55km/hr on 48v and use A123
cells.

code by jerry