MotorControl SystemInstrumentationChargersRear battery packWiring SchematicTachometer Sensor
OwnerJames Voth
LocationSurrey, British Columbia Canada map
Web/EmailWebPage email image
Vehicle1992 Mazda MX-3
A low budget commuter/runabout
MotorBaker Series Wound DC
Forklift hydraulic pump motor
Reversed and timed for correct rotation
110 lbs, 8" dia X 13" long
Drivetrain5-speed gearbox, clutch removed
ControllerAlltrax AXE7245
Fan cooled
Batteries12, 12.00 Volt, Lead-Acid, AGM
Paccar/TRP BA27D51 AGM batteries
They are a rebadged Deka 8A27M
Six groups of parallel pairs to achieve 72V
System Voltage72 Volts
Charger eCity 240W
Six 12V, 10A PWM chargers purchased from
14.7V max, 13.7V float
They keep my AGM batteries perfectly
HeaterHeating coils from a blowdryer installed
into heater fan ducting, powered by full
pack voltage
9A X 75V = 675W
Preheat with a 120VAC heater on a timer
DC/DC Converter Group 31 Battery
Charged by a 2A smart charger
InstrumentationSystem volt meter
Individual battery monitoring meter with
selector switch
Top Speed60 MPH (96 KPH)
AccelerationKeeps up with traffic. I haven't been
honked at yet!
0-30 MPH: 12 sec
0-40 MPH: 22 sec
0-50 MPH: 35 sec
0-60 MPH: 55 sec
Range25 Miles (40 Kilometers)
Estimate. No chance to test the range yet
Do I really want to?
Watt Hours/Mile455 Wh/Mile
Measured at the wall
EV Miles
Start:174,807 Miles (281,264 Kilometers)
Current:177,252 Miles (285,198 Kilometers)
Total:2,445 Miles (3,934 Kilometers)
    As of 5/17/2014
Seating CapacityTwo
Curb Weight3,200 Pounds (1,454 Kilograms)
TiresStock 185/65R14
Inflated to 45 psi
Conversion Time49 days
Conversion Cost$3800 including the car
Oct 19, 2012 - Started commuting.
Nov 23, 2012 - New AGM batteries installed
Wow did they ever make a power difference!
Nov 29, 2012 - PWM field controller installed
Dec 04, 2012 - Kelly charger installed
Dec 23, 2012 - Kelly charger removed due to severe battery
balancing issues
Too much variance in battery internal resistances
Six chargers reinstalled
Jan 10, 2013 - eCity chargers installed
Mar 01, 2013 - 2A smart charger installed on accessory
May 23, 2013 - Top speed run: 60 MPH
Sep 20, 2013 - Replaced 7" sepex motor with 8" series wound
Added a better battery monitoring system (@ 283,507 KM)

code by jerry