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I Have a Really Dumb Question

I was just reading about BMW's range extender for their electric car, essentially a small gas motor to charge the battery. Why not simply have an electric generator that runs when the car runs to charge the battery? I'm sure it's been thought of before, so there's probably a reason that it's not being done, but I have no clue as to why it wouldn't work. I mean, we already have generators in gas cars that charge the battery. Granted, it probably wouldn't fully charge the battery, but it would certainly have to charge the battery somewhat.

How is that different from the ICE in "range extender" hybrids like the ELR? Buying an ICE generator at Sears and mounting in the frunk isn't different in concept from that, unless I'm missing your point.

What is a frunk?

A "frunk" is a small 'trunk' storage compartment at the front of a Tesla MS. It's a bit similar to the front trunks of VW beetle cars. Of course, the MS also has a spacious trunk in the rear portion of the car.

Ron :)

Yes she sierra this has been thought of.

The alternator in an ICE car is driven by the engine... by gasoline. Mounting one to extract energy from motion of a model s would just make the motor work harder. You would be using power from the battery.... to charge the battery.

Does that help you see why this would discharge, not charge, the battery even faster?

If you mean add an ICE to model s.... not going to happen.

"Mounting one to extract energy from motion of a model s would just make the motor work harder. You would be using power from the battery.... to charge the battery."

Aha!

As the Engineers say, "There is no free lunch".

Sin_Gas

@ shensierra (OP: July 17, 2014)

<< BMW's range extender for their electric car, essentially a small gas motor ... >>

Tesla has a registered patent for an Al-air Range Extender, similar to the Alcoa-Phinergy "battery" (which is not a battery, but a chemical generator of DC current) that can supply around 1000 miles range extension and could be used as a recharger of the MS' propulsion battery, during the longer trips, provided Tesla Motors supplies the necessary DC connectivity.

Check (rejoin the 3 fragments for the complete address):
http://www.
computerworld.com/s/article/9248966/Electric_car_battery_tech_lets_you_go_1_000_miles_between_charges

The cost is likely to be comparable to an ICE doing the same job.

Recently, Phinergy CEO and Founder, Aviv Tzidon confirmed talks with Renault-Nissan are tentatively set for a proposed series production EV due in 2017 using its range-extending aluminum-air battery.

Check (rejoin the 2 fragments for the complete address):
http://www.
hybridcars.com/renault-nissan-to-use-phinergys-aluminum-air-battery/

Here's a really dumb answer: you can't fit enough hamsters in to make a difference! ;p

But what if I used two(2) hampsters operating in tandem and supplementing one another...?

It'd work then, wouldn't it?! Lol


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