rear battery boxcharginginstrument panelmy co-workerdrivetraininteriorfront battery boxfront battery box
OwnerDave Hale
LocationSunland, California United States 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 3p54s

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.



Batteries managed by Elithion Pro BMS
System Voltage216 Volts
ChargerElcon HK-J-H440-20
HK-J series 6.6KW IP67 sealed CAN bus

charger. The J1772 standard dictates the

charge current and controls the charger via

CAN bus (using my own design EVSE

interface).
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

* State of Charge gauge
Top Speed80 MPH (128 KPH)
have not attempted faster
Accelerationunmeasured, but about like the original 914.

Good enough, but not winning any races.
Range50 Miles (80 Kilometers)
60-80 possible depending on driving

conditions.



Theoretical max is almost 100 mi

(19.4kWh/200Wh/mi) but I currently have the

BMS programmed to give me about 50 miles

range.
Watt Hours/Mile200 Wh/Mile
EV Miles
Current:57,753 Miles (92,924 Kilometers)
 
    As of 9/20/2024
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 />
tire/green



40 psi
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 Costyou can't put a price on love
Additional Features* Regenerative braking

* New dash instrument cluster

* Console-mounted computer displays telemetry, acts as radio,

MP3 player, GPS, etc.

* J1772 inlet finally added 11/11/18 (previously charged from a

standard 110 outlet)

* Smart J1772 EVSE interface (of my own design and

construction)
drove 12,669 miles on lead-acid batteries, from 2009-2011.

Vehicle sat idle from 2011-2016 until Li-Ion added, back online

1/29/2016 at 12669 mi under Li-Ion power.



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



914electric.blogspot.com


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