Question: electric motor output VS Range

Question: electric motor output VS Range

hey guys I'm just wondering if anyone can explain this to me as this question has been on my mind for quite some time and I can't figure it out.

the P85 has a 85kw/h battery and is good for 265 miles and the motor has an output of 310kw/416HP. Hypothetically speaking if they were to make a Model S with a 155kw/208HP motor(half of the current output) and still using the same 85kw/h battery would that mean you would have double the range (530 miles) ?

I know aerodynamics,drag,weight,hills,ect all come into effect but I'm just talking in a perfect world so I can understand how consumption works.

if the motor only had half the output wouldn't you only need half the battery to do the same thing?

Thanks Luc

negarholger | November 13, 2013

On average you are using around 30 kW driving... motor size is really not a penalty with EVs unlike ICEs.
310 kW is the peak output, a smaller motor would just limit the acceleration.

Dramsey | November 13, 2013

What he said. The motor isn't generating its peak horsepower all the time, so switching to a smaller motor simply imposes an acceleration penalty.

Luc Allain | November 13, 2013

so unless you had your foot into it motor output doesn't affect range for the most part.

that clears it up a lot

Thanks Luc

olanmills | November 13, 2013

Yeah, remember that nominally, the P85, S85, 60, and 40 versions of the car all use the exact same amount of energy if they are traveling the same speed for the same duration under the same conditions. (Now in reality, the differing components might cause some difference do to electrical efficiency, differences in weight, etc).

The P85 just has more power output which allows you to accelerate faster.

Luc Allain | November 14, 2013

Thanks Guys you have been all been very helpful.

Except english is not my first language and I don't have a freaking clue what a1466708620 is trying to say(almost looks like he or she is making fun of me) must be a spammer?

but to everyone else thank you


olanmills | November 14, 2013

English is my first language and I can tell you that a1466708620's post doesn't make any sense, but that is typical, because it is a spam bot trying to advertise.

Brian H | November 14, 2013

Flag it.

Dwdnjck@ca | November 19, 2013

I read once that more powerful electic motors are more efficient, so smaller motors wouldn't help efficiency, but they would make the car less compelling.