1.1kW motorBattery packOut with the old
OwnerTuarn Brown
Owner's Other EV1982 Suzuki Sierra SJ40 uses AC induction motor
LocationPerth, Western Australia Australia map
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Vehicle1980 Isuzu Gemini
Isuzu (Holden) Gemini sedan was originally 4 speed manual with 1.6ltr petrol engine.
MotorWE 1.1kW 80 frame 3-Phase AC
Western Electric 1.1kW 3 phase 200V (delta) 2 pole motor. 3.7Nm torque
50Hz 3000RPM quite happy at 9000RPM.
DrivetrainAC motor connected to 20:1 planetary gearbox then direct to tail shaft.
This gearbox was quite noisy and consumed 1kW on its own at 9000RPM.
ControllerDanfoss VLT2815
1.5kW nominal with 160% overload to 2.7kVA max. Has extended braking and DC bus sharing option.
Batteries30 Henda 7.2Ah, 12.00 Volt, Lead-Acid, Gel
SLA UPS batteries, good capacity at 2C (for lead acids) around 4Ah.
Pack capacity 2.5kWh
System Voltage360 Volts
Charger simple
mains step up transformer (270V)suppling Danfoss line input. Danfoss looks after charging.
DC/DC Converter Radix 12V
separate 12V 26Ah
Instrumentationspeedo, and all Danfoss display information
Top Speed9 MPH (14 KPH)
5kmph uphill, 10 on the flat and 15 down. That's 3000, 6000 and 9000 RPM on the motor.
Accelerationgreat... up to 5kmph
Range6 Miles ( 9 Kilometers)
Not bad on 2.5kWh of SLAs in a 900kg EV
Watt Hours/Mile300 Wh/Mile
Seating Capacity4 adults
Curb Weight2,000 Pounds (909 Kilograms)
Conversion Time4 months
Conversion CostAUD$900
Additional FeaturesYou have never experienced regenerative braking until you have driven an EV with an AC motor. It brakes with as much torque as it accelerates, right down to a stop.
It is not being driven to a holt, rather It is extracting the kinetic enery from the vehicle. All that power going back into batteries. Depending on the type of battery, this recovery can be 90%. Roll on super capacitors !
Overall an improvement of 10 to 30% in range and little use of foot brake.
This was a trial in EV conversion using small scale parts and proving the simple 'off the shelf' AC motor and controller option.
It was not a road vehicle but the idea was then scaled up to the 'Red Suzi' (also on evalbum).
The Gemini's controller and batteries have been sold on however we will set it going again one day to drive around the farm.

code by jerry