rear battery boxcharginginstrument panelmy co-workerdrivetraininteriorfront battery boxfront battery box
OwnerDave Hale
LocationSunland, California US map
Email email image
Vehicle1972 Porsche 914
Purchased running from craigslist for $2000 (factoring in the
$500 I got for the engine), with the intention of converting to
electric.
MotorAzure Dynamics/Solectria AC24LS 3-Phase AC
Drivetrain5 speed manual transmission (upgraded to side-
shifter) coupled through stock clutch & lightened flywheel to
electric motor.
ControllerAzure Dynamics/Solectria DMOC 455 II
Batteries324 LG Chem, 4.15 Volt, Lithium-Ion
Cells are lithium manganese oxide (LiMn2O4)
manufactured by LG Chem for the GM Chevy Volt. They
were salvaged from a crashed 2013 Volt.

Pack consists of two "batteries" in parallel. Each battery
consists of 54 cells, so I have 108 individual cells to
monitor. Each cell is actually 3 Li-Ion pouch cells in
parallel, spot-welded at the tabs.

Each pouch cell is 15Ah/4.15v nominal. 3p makes 45Ah.
54 cells in series at 4.15v makes 224v. Two of these in
parallel makes 224v/90Ah, nearly 20 kWh. I chose to not
charge them fully, so I operate them at about 19kWh.

Elithion Pro BMS
System Voltage216 Volts
ChargerElcon PFC2500
Programmed with Alg520v and set to 226v. Operates on 110
or 220vac.
DC/DC ConverterIota 501-DLS-110-55-K
DC-DC Converter, 636W, 53A, 120-370vdc Input, 10.5V-
14.5VDC Output

EVSource Item# 500-DCDC-636
WebPage
Instrumentation* 6-16V Aux Battery Volts
* +/- 200A AMPS
* New electronic speedometer from NH Speedo
* Refurb orig tach
* Elithion State of Charge gauge
Top Speed70 MPH (112 KPH)
Accelerationunmeasured, but about like the original 914. Good enough,
but not winning any races.
Range65 Miles (104 Kilometers)
calculated, but so far supported by the Elithion BMS columb
counting
Watt Hours/Mile300 Wh/Mile
TBD. The original conversion with Lead-Acid I measured at
350 Wh/mi, running average of mixed driving, plug-to-
wheels, including charger efficiency.
EV Miles
Current:12,450 Miles (20,032 Kilometers)
Seating Capacity2 adults
Curb Weight2,260 Pounds (1,027 Kilograms)
TiresMichelin Energy Saver A/S, Low Rolling Reistance
195/60R15 87T SL Green X
WebPage
Conversion Timeoriginal conversion took 3 mo of evenings (maybe 200-300
hours??) Removed engine on 2/1/09; started driving it on
4/30/09.

Upgrade from lead-acid to Lithium took longer.
Conversion Costabout $20k including donor vehicle, conversion kit, and
batteries (not including some extra, optional work)
Additional Features* Regenerative braking
* New dash instrument cluster
* Modified (light weight) flywheel
Other, non-EV-specific work I did to the car:

* Added beefier torsion bars, KYB front shocks, and KYB rear
suspension
* Porsche 911 turbo tie rods
* New ball joints, CV joints
* POR-15 for cargo and engine compartments
* Elephant Racing PolyBronze suspension bearings (front
control arms)
* Newly rebuilt later-model side-shifter transaxle
* Modified (lightened) flywheel



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