Battery Pack:

108 3.2v, 100Ah cells (ThunderSky – LiFePO4)
Nominal voltage: 345V

Peak voltage: 400V (occasional finishing charge to 450V)
Low voltage: 270V
Weight: 713 lbs

15 Minute rating: 3C; 140 HP (105 KW)
Impulse rating: 10C; 420 HP (300 KW)
Max charge current: 3C (20 minute charge): 300A @ 400V; ~210A off 480 3phase (many commercial circuits are 500A 480-3phase)
Optimal charge current: 0.3C (3 hour charge): 30A

Energy Density:  (based on a TS160lfp since the 100lfp isn’t available anymore)
(vol): 140.5 wh/l
(weight): 91.4 wh / kg — 41/5 wh / lb

Total Capacity:

34.5 KWh; usable capacity (80% DOD): 27.5 KWh (88 MJ)

Estimated Range: 100 miles

Estimated Electric Eff: 345 wh/mile (half of Tesla)

Estimated Gas Equivalent: ¾ gallon; 95.2 MPGe (EPA conversion factors)

Rated Cycle Life: 2,000 cycles

Estimated battery lifespan: 200k miles (to 80% capacity)

Inverter/Motor:

Motor weight: 176 lb (MES-DEA 200-330 – 3phase AC motor)
Inverter weight: 22 lb (MES-DEA TIM600 – 100 KW w/Regen)
Inverter Rated power: 100 KW

Inverter Efficiency: 95%
Motor 1 hr power: 40KW
Max Torque: 221 ft-lb

Max RPM: 9,000

Shift RPM: 3,000 (for maximum power)

Motor Cooling System: Liquid cooled

Charger:

220 or 120V, settable current up to 40A.
Charge time: 4 hrs (220V, 40A) , 8 hrs (220V, 20A), 20 hrs (120V, 15A)
BMS-Controlled

Car Summary:

1998 Porsche Boxster 5 speed manual
Estimated 550 lb weight gain (913 lb EV drivetrain+battery weight)

0-60: tbd
¼ mile: tbd
Top Speed: @105mph

Range: 100 miles (estimated using DOD UDDS drive cycle)
Freeway range: @75 miles
Estimated Gas Equivalent: ¾ gallon; 95.2 MPGe (EPA conversion factors, assuming UDDS drive cycle)
—

To get the range, you get batteries that are very capable of power. The motor/inverter is the weak link in the performance bit right now.
Every 5 pack of batteries gets you a mile, 1.28 HP (almost a KW) (though the rumor is that T-sky is “optimistic” about 3C).

Porsche Boxster EV Prototype

I am a technologist and a car nut.  I love to dream up new and interesting projects that keep my life interesting.  Several years ago, I marveled at the creation of the Tesla Electric Roadster but was surprised at the time and expense it took Elon Musk and the Tesla team to design and build it.  While they were building a production electric vehicle from the rolling chassis of a Lotus Elise, I began to realize that with the right people and resources, a high quality electric vehicle could be produced with just about any existing internal combustion engine vehicle.

This was a large project but three years after starting with three people, we have built a high performance electric vehicle from a 1998 Porsche Boxster.

This blog series will document our conversion process from why we chose the Porsche Boxster to build decisions and how to title and register it for road use.  Stay tuned… this should be a fun ride!