|Location||Silver Spring, Maryland US map|
|Vehicle||1974 Porsche 914|
|Motor||Prestolite MTC4001 Series Wound DC|
Advanced 7 degrees for better high speed efficiency to use 2 gears 2 & 3 up to 65mph
|Drivetrain||5 speed with typical rubbery shifting. Brakes could be better, may upgrade to a 914-6 or 911|
|Controller||Curtis PMC 25|
400A needed 150uH of additional choke in series with motor with bypass contactor around both and engage contactor which closes on each peddle press for safety requirements.
|Batteries||16 Saft STM5-180, 6.00 Volt, Nickel-Cadmium, Flooded|
Battery Scanner displays all battery voltages simultaneously. Mark built in a watering system that connects all batteries. Nifty. Full charge voltage is around 108 v.
|System Voltage||96 Volts|
Golf Cart Ferro resonant set to push-pull and fan added to charge to 138V for 1.73V per cell at 7.5A Saft spec. When .01V per cell per hour (2 hours match then stop).
|DC/DC Converter|| VP-12124|
Modified from www.valcom.com through Graybar electric supplier design I did, output set to 14V. Also backup dc converter (48V tap) set to 13.5V incase the main one isn't feeling well
|Instrumentation||charger display, battery scanner, batt temp, battery amps, volts|
|Top Speed||80 MPH (128 KPH)|
60hp peak, 25hp continuous.
HP on the freeway, just multiply the amps (150) x the volts (120) = 18K. For no losses you'd divide by 750 (24 hp) but in reality it works out to about 1kw per hp with losses so that's about 18hp going down the freeway.
|Range||35 Miles (56 Kilometers)|
That's if you are taking it easy.
|Watt Hours/Mile||450 Wh/Mile |
AC measured at line (proper way to measure)
|Seating Capacity||2 adults|
|Curb Weight||2,820 Pounds (1,281 Kilograms)|
Start was about 2000 pounds
|Tires||stock pumped to 45psi|
|Conversion Time||600 hours|
|Additional Features||Electric Porsche 914 with 16ea STM5-180 6V Ni-Cads (Saft) 96V Prestolite MTC4001 motor, Curtis PMC 25 (2kHz to scare away animals & eliminate road kill). Has my VP-12124 DC converter I designed for Valcom and charger using dv/dt=0 algorithm. MIG welded chassis on, best kit from Brad Mayuer 309-694-1797 and Porsche parts. Did complete restoration, 600 hours including conversion about $10k total, Mark 540-473-1248.|
Now owned by Charlie Garlow 202-564-1088 who got a steal of a deal from Mark, great guy.