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eRUF Electric Porsche Powered by UQM, Axeon

Battery and motor packaging in the eRUF. Click to enlarge. Source: CalMotors

The recently introduced eRUF Porsche-based all-electric sports car is being powered by a UQM PowerPhase 150 electric propulsion system. The eRUF is being developed by RUF Automobile GmbH, a manufacturer of high-performance automobiles and producer of the renowned CTR-series of sports cars.

The eRUF all-electric sports car, designated the eRUF Model A, accelerates from zero to 100 kph in less than seven seconds and has a top speed of 225 kph (140 mph). Estimated range per charge is 250 kilometers to 320 kilometers (155-199 miles), depending on performance level, using a 50.72 kWh lithium-ion iron-phosphate pack from Axeon plc.

The UQM electric propulsion system in the eRUF Model A puts many conventional combustion engines to shame, producing a maximum 650 Nm of torque output which rips into the drive shaft so impressively during acceleration, that one is immediately reminded of the extremely powerful RUF Rt 12.

—Alois Ruf Jr., owner and CEO of RUF Automobile GmbH

Ruf engaged CalMotors in Camarillo, California, specialized in the implementation of hybrid-electric and electric-only power train design, to combine the lithium-ion batteries with the motor.

The battery pack consists of 96 160Ah Axeon lithium-ion iron-phosphate cells, each weighing 5.6 kg (12.3 pounds). Total weight of the pack is 550 kg (1,213 lbs). The pack is constantly monitored by an intelligent bus system from Axeon. Each individual cell is coupled with a sensor that sends information on cell temperature and voltage to the central control system. The cells, with a nominal voltage of 3.3 V, have a lifecycle of 3,000 charging cycles.


nrg nut

It'll be fun to see one of these things in the Smithsonian a hundred years from now. People will think - a half ton battery???


It will be very good when the total vehicle weight is down to that (550kg).Paying for it requires just a little less that weight in gold I'll bet.
I guess that if anyone asked for all the above specs - performance, distance, etc etc, we would always come up with what we see.
In that respect a credible effort. A niggling thought says this will indeed be a sought after exhibit.

John Taylor

Nice to see a Porch go electric.

When it works for the top end, it will work for the average wagon.


Maybe I'm dense here (and I'm sure someone will correct me!) but why do companies expend all these resources on an all-electric vehicle instead of doing some kind of PHEV? I would be interesting to see what challenges are needed to integrate a small engine in such a system.

Size the engine to the average power needs for the vehicle at cruising speed (60-80 mph). What would that be, 50-70 hp? Weighing 400-500 pounds? If you did that, you could take out 75% of the batteries, the net result would be cheaper, lighter, longer range, nearly same impact on environment/resources usage.

I'm saying this because PHEVs will be difficult to perfect, so working examples are helpful, whereas this is something that will never be produced in significant numbers, maybe not more than 1.


@ nrg nut

3000 x 285Km (average 250-320Km) = 855000 Km

Smithsonian? Dude! - They will still be on the roads!

:-) (If I did my math right)


I disagree, Jim.
100+ mile range and overnight charging is suffecient for a large segment of car owner now, without the need for an onboard generator. Based on price estimates for the Chevy Volt compared to BEVs in the works from other manufacturers, the price difference may not be much. Less parts, less maintenance, and dropping battery prices should make them comparable to todays conventional vehichles with mass production.
I beleive that battery capacity and charging time will improve rapidly. A few years down the road, we will all be driving electric cars that trave 4-500 miles on a 10 minute charge, and the PHEV will go the way of the 8-track tape.


@ Jim

I think they are trying to go Tesla route. Get people interested with the WOW factor. Make it cool to own an EV. Dress it down somewhat (maybe under VW badge) later.

But don't worry - just about every automaker out there is working on PHEVs (and EVs) right now to be produced in a year or two.


Placement of 5kg batteries for and aft or 'polar weight distribution' is not the ideal especially in a Porshe.
Ferrari, Masserati and some Porshe models go to much trouble placing as much of the mass as possible close to the the center of gravity as this promotes faster steering response.
Polar weight placement can give a feel of directional stability, but will certainly increase the tendancy for end swapping.

I got backpressure for complaining about battery and fuel tank placement on the roof of a fuel cell bus some months ago, but note a later article reported that the manufacturer? had downrated the speed limit to 55MPH owing to instability issues related to high center of gravity.
I was considering the air drag aspect and the stresses placed on he coachwork which on a vehicle in motion is already challenging structural engineering.

A response to my post suggested that convenience in servicing justified roof placement and one might be tempted to make a similar allowance in this instance.
I think it is important to always consider best practice learned over time and go the extra distance on principle.


I agree with Jim's post.
Why isn't there an electric vehicle with a small ICE that ONLY generates electricity. It can be ultra-optimized to run at a certain RPM.

This would extend the range and cut the cost.

It doesn't look like batteries are going to be there for another decade. If batteries do progress faster, then drop the ICE.


@ arnold

Agree that in pictured Porsche (911) it is not ideal to place weight outside axles.
But I think that this way (batts at both ends, weight distribution closer to 50% than in 911 with rear engine) the electric version is more balanced.

As for the BAE Systems bus with batts and control module on roof (as of 6 October 2008, not "some months ago"):
Batt pack is rather small, 8kwh (see latest posts there), not too heavy.
My guess is they wanted to avoid significant structural modifications to the floor of the existing Orion bus. So they had to choose between quite hot engine compartment and the roof. The roof option was less bad.

If I recall properly, some CNG buses place their tanks on the roof, so it's not that uncommon.
City buses are usually slow moving.


Hmmmm - I might be the one who is dense, but let's see now. The battery gives 50.7kWh under ideal conditions (Brand new, ideal temperature etc)To get your 250-320 km you will need how long time? Say 3 hrs. You can then use an average of 16kW. Use the accelerator once and 80-100km seems much more realistic. Say that it is 0C outside, you want to use heater, headlights and wipers and suddenly you're left stranded after 30 miles...
Secondly, you may get the reported performance, but not at the suggested battery life. Discharge faster than nominal discharge rate and you quickly kill the battery cells. Haven't checked Axeon's cells, but as some rule of thumb for a 500kg Li-Ion pack they may accept some 80-100kW of discharge without getting into the loss of life area.
What have I missed when I have a hard time believing in pure EVs?



Got all the Naysayer angles covered pal? LOL

Do you have any idea that the ICE you drive daily is about as energy efficient as an incandescent light bulb? From fuel tank to tires ALL gasoline-powered cars are approx 15% energy efficient. An EV like the Tesla uses 200wh/mi at a cost of $0.01 per mile. Any ICE powered car of comparable performance (absolutely no point comparing it to a Honda Civic... a Civic doesn't do 0-60 in 3.9 sec) costs more like $0.30 a mile and the difference is going out your radiator and exhaust system as useless heat! You read right 30x the cost per mile to drive an ICE.

And there's not much difference between the cost of a kw/hr be it liquid or electron, an ICE just wastes 85% of it.

Do some fact finding before you mouth off pal, otherwise you’re just displaying your ignorance.


OOps, that's @ Beyfon

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