Help me understand: ER vs acceleration

[Chuck]

I've heard a lot of people on this forum and elsewhere that say they purchased extended range batteries to get better acceleration.

However, if I remember from my college days when I was an electrical engineer, the only two way to increase the torque (acceleration) is to increase the voltage of an existing battery or to get a different motor. AFAIK, the extended range version doesn't do either of those and all the extended range battery does is extend the range. Not only that, the ER battery packs add more weight which, in theory, should hurt acceleration.

I'm not talking AWD here which may increase acceleration with added, smaller motor, I'm just talking ER batteries.

Am I missing something?

Sponsored

 

[JamieGeek]

Not voltage: Current.

ER has more cells which can provide more current.

For example: If each cell can provide an amp, 10 cells will provide 10 amps, 20 cells will provide 20 amps. (since they are the same voltage volts*amps=watts so more power too)

 

[BMT1071]

I've heard a lot of people on this forum and elsewhere that say they purchased extended range batteries to get better acceleration.

However, if I remember from my college days when I was an electrical engineer, the only two way to increase the torque (acceleration) is to increase the voltage of an existing battery or to get a different motor. AFAIK, the extended range version doesn't do either of those and all the extended range battery does is extend the range. Not only that, the ER battery packs add more weight which, in theory, should hurt acceleration.

I'm not talking AWD here which may increase acceleration with added, smaller motor, I'm just talking ER batteries.

Am I missing something?

The larger battery only improves acceleration if you also opt for AWD. The RWD ER is the slowest of the MMEs. In addition to the increased potential provided by the larger battery the internal wiring is a heavier gauge to allow for increased current flow.

 

[SnBGC]

Not voltage: Current.

ER has more cells which can provide more current.

For example: If each cell can provide an amp, 10 cells will provide 10 amps, 20 cells will provide 20 amps. (since they are the same voltage volts*amps=watts so more power too)

Agree.
In the end it always comes down to watts. More watts=more work

 

[JohnFoxeSheets]

I've heard a lot of people on this forum and elsewhere that say they purchased extended range batteries to get better acceleration.

However, if I remember from my college days when I was an electrical engineer, the only two way to increase the torque (acceleration) is to increase the voltage of an existing battery or to get a different motor. AFAIK, the extended range version doesn't do either of those and all the extended range battery does is extend the range. Not only that, the ER battery packs add more weight which, in theory, should hurt acceleration.

I'm not talking AWD here which may increase acceleration with added, smaller motor, I'm just talking ER batteries.

Am I missing something?

The larger battery only improves acceleration if you also opt for AWD. The RWD ER is the slowest of the MMEs. In addition to the increased potential provided by the larger battery the internal wiring is a heavier gauge to allow for increased current flow.

The above is from the Mach E Specs comparison chart. The columns are Select, Route 1, Premium, and GT. ER RWD is slower than SR RWD (presumably due to the added weight), while ER eAWD is faster than SR eAWD (presumably due to the greater current sourcing ability of the ER battery pack being able to drive two motors faster than the SR pack can). Though in all cases the differences from SR to ER are small...

 

[RickMachE]

Watt? Watt?

Sponsored