NoBeard
Member
I'd like to see a battery pack that could be mounted in a trailer that could couple up to an X, and provide both extended range and trailer power.
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There’s a diminishing return on increasing the battery pack. As weight goes up, the energy required to move that weight goes up exponentially... it’s not linear.
I don't think those things would help much.I don't think bigger batteries are chasing a necessary dream at this point — a 120D would just be wasteful. I think now we have to make the motors more efficient, and find better ways to charge & cool the batteries. That would pay off more than going from 300 to 360 miles on a charge.
Care to elaborate more on this? From what I remember of high school physics, mass is linear factor in most formulas.
F = m * a
E = 1/2 * m * v^2
P = m * a * v
etc...
Those would all imply a linear relationship. Unless I'm missing something I don't think there are diminishing returns on weight vs energy.
Care to elaborate more on this? From what I remember of high school physics, mass is linear factor in most formulas.
F = m * a
E = 1/2 * m * v^2
P = m * a * v
etc...
Those would all imply a linear relationship. Unless I'm missing something I don't think there are diminishing returns on weight vs energy.
I don't think bigger batteries are chasing a necessary dream at this point — a 120D would just be wasteful. I think now we have to make the motors more efficient, and find better ways to charge & cool the batteries. That would pay off more than going from 300 to 360 miles on a charge.
The majority of Tesla cars (MS and MX at least) are not commuter cars.I totally know how you feel, but the truth is the majority of Americans' round-trip commutes are less than 300 miles a day.
Simple math using a model X...
Using round numbers, It’ll go let’s say 250 miles on 100kwh at 6000lbs. That’s 400 wh/mile or 15wh/lb/mile
If you double the battery capacity to 200kWh, that’s another 1400 lbs all things being equal. 7400 lbs at 15wh/lb/mile is now 494.3 wh/mile with a 200kWh battery nets you 404 miles of range.
Off the top of my head, here are the actual forces you have to counteract to move the car:
1. Air resistance - proportional to frontal area and square of speed.
2. Rolling resistance - proportional to weight and speed
3. Drivetrain friction - proportional to speed and torque
4. Road gradient - proportional to weight and speed
5. Acceleration - proportional to weight
If you drive at a constant speed on a flat road, only the rolling resistance is proportional to weight. The biggest factor - air resistance - is not dependent on weight at all.
It's clear that adding weight adds energy cost, but I think it's less than linear, not to speak of exponential.
Tesla is trying to move all their inventory also saying that free unlimited supercharging is going away in September. Also from experience, when I was purchasing my MS 85D a few years ago I heard there was a 90kW battery that will be offered as standard as they were phasing out the 85 and it was just a rumor. All Tesla employees sore it was just a rumor and sure enough 3 months after my purchase the 990 is available.
The majority of Tesla cars (MS and MX at least) are not commuter cars.
Dude, you need to take a load off Fannie.No rumor is true until I hear it from my sister's husband's brother's Aunt Fannie.
How do these threads even get started?
The majority of Tesla cars (MS and MX at least) are not commuter cars.
Lol. I can't believe you are so self-centered that you think all Tesla owners are travelers like you. Every Tesla owner I've ever known (dozens) use it as their daily driver and their work commute. I don't think I've ever seen a Tesla (other than the Roadster, of course) that was used for only recreation.
The world doesn't revolve around you, and disagreeing with my posts doesn't change that.