|Location||Los Altos, California US map|
|Vehicle||1973 Porsche 914 |
Arrived here orange and hollowed out (engine-less) on Halloween 2006. Instant name!
|Motor||Azure Dynamics/Solectria AC24 3-Phase AC|
|Controller||Azure Dynamics/Solectria DMOC445|
Regenerative braking extends the range a little, especially in stop & go driving. Saving the friction brakes is probably the best effect.
|Batteries||14 Deka 8G24M, 12.00 Volt, Lead-Acid, Gel|
Performance of the Azure Dynamics motor-controller would be compromised by using the standard Electro Automotive 144-volt traction pack -- a limit imposed by the DC-DC converters they offer. Decided to avoid the problem by developing a DC-DC converter capable of operating at up to 200 V input. This turned out to be a good choice.
|System Voltage||168 Volts|
|Heater||(none) Hey, it's California!|
|DC/DC Converter|| MS Special|
Uses 2 Vicor BatMod modules with packaging and control circuitry that I designed. Functions as the main power source for 12-volt system and as charger and maintainer for the back-up battery.
Input: 100 to 200 VDC
Key on: 13.5 V, 28 A max
Recharge: To 15 V max, 3.7 amps max
Float: 13.0 V
|Instrumentation||Standard Porsche 914 instruments plus current and voltage meters for the traction motor.|
|Top Speed||70 MPH (112 KPH)|
|Acceleration||0 to 30 mph 9.8 sec|
0 to 40 mph 14.5 sec
No Tesla but it feels peppy enough.
|Range||30 Miles (48 Kilometers)|
|Watt Hours/Mile||350 Wh/Mile |
Calculated using energy drawn by the Zivan charger to fully recharge the pack, as measured by a kW-hour meter on a dedicated 240 VAC line to the charger.
|Seating Capacity||2 adults|
|Curb Weight||2,600 Pounds (1,181 Kilograms)|
Weight distribution 50/50 front/rear
|Conversion Time||9 months of work on the car preceded by about 10 months of design and development work on the DC-DC converter.|
|Conversion Cost||$20k (approx)|
|Additional Features||Photo-voltaic panels on the house roof produce electricity during the afternoon for which the power company credits us at a high rate per kW-hour. We delay re-charging until the evening when the electricity price is lower. The net effect is zero cost for electricity for both the house and car. What we would otherwise pay for gasoline helps amortize the cost of the PV array.|
|Use of Electro Automotive parts definitely shortened the development time. Battery racks and motor-to-transaxle adapter parts have worked out well.|