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
* Elithion 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:41,300 Miles (66,451 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 /> 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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