OwnerJB Straubel
Owner's Other EVElectric Bike
LocationPalo Alto, California United States map
Web/EmailWebPage email image
Vehicle1984 Porsche 944
MotorAdvanced DC 203-06-4001 Series Wound DC
two 8"
DrivetrainMotors in the front stacked and belted together into a front flywheel/clutch. Transmission in the rear, manual 5-speed.
600 Amp microprocessor controlled
Batteries20 Optima 750 DS, 12.00 Volt, Lead-Acid, AGM
Yellow Top
System Voltage240 Volts
6 kW 120 / 240 VAC, microprocessor controlled
DC/DC ConverterPower-One
custom modification 40 Amp
InstrumentationCustom, dash mounted display panel (full system monitor) Custom battery multiplexer box, reads the voltage on every battery and provides a serial output.
Top Speed110 MPH (176 KPH)
Range30 Miles (48 Kilometers)
Seating Capacity2 adults
Curb Weight3,100 Pounds (1,409 Kilograms)
TiresYokohama/Firestone (better traction than efficiency)
Additional FeaturesCustom battery management system incorporated into the charger. Independent balancing resistors (light bulbs) can be switched in across each battery. This is controlled by a microprocessor reading the battery voltages through a custom A/D converter that multiplexes and reads the battery pack at about 4Hz. (Measures every battery 4 times per second)

The car also has a trailer hitch and a hybrid trailer controller on board. This allows the driver to control the pusher trailer from the front on the freeway for longer trips. The range with the hybrid trailer is over 300 miles.

See version one at:
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or the new inproved version 2 at:

code by jerry