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post #41 of 334
Quote:
Originally Posted by Lady Fitzgerald View Post

Two words: battery swapping.

That would seem to be the only viable solution to the range and recharge issues but the infrastructure requirements for trucking companies to have fully charged batteries ready to go for rigs along their routes would be daunting, and somehow I doubt batteries this massive and heavy would exactly be 10-minute swaps.
post #42 of 334
Thread Starter 
Quote:
Originally Posted by Majin SSJ Eric View Post

That would seem to be the only viable solution to the range and recharge issues but the infrastructure requirements for trucking companies to have fully charged batteries ready to go for rigs along their routes would be daunting, and somehow I doubt batteries this massive and heavy would exactly be 10-minute swaps.

The batteries will come from Tesla.... Based on what the article says.
post #43 of 334
Quote:
Originally Posted by Majin SSJ Eric View Post

Quote:
Originally Posted by Lady Fitzgerald View Post

Two words: battery swapping.

That would seem to be the only viable solution to the range and recharge issues but the infrastructure requirements for trucking companies to have fully charged batteries ready to go for rigs along their routes would be daunting, and somehow I doubt batteries this massive and heavy would exactly be 10-minute swaps.

Actually, Musk proposes swapping out the batteries in as little as 90 seconds (and demonstrated it) although 5-10 minutes would be more reasonable.

As far as the infrastructure goes, Musk is proposing starting with 1500 charging stations. That would probably limit use of the electric semis to the Interstate Highway system and destinations near the Interstates at first. Musk has the money (or can get it) to pull this off.

You really need to read the articles before commenting.
     
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post #44 of 334
The diesel engine in a semi is around 2000-3000 pounds. A comparable electric motor is going to weigh a substantial amount as well. Modern semis have engines around 600HP, and they use every bit of that going up hills. 600HP is 450 kW, which is an enormous amount of power and would require a battery pack atleast 10-15x the size of a Model S to have comparable range to a diesel fueled semi.

That's 18,000 pounds worth of batteries, and 18,000 pounds less cargo you can carry. That's a big deal.

As far as it being "like a sports car", any modern 600+ HP semi feels quick unloaded.
post #45 of 334
Quote:
Originally Posted by Mookster View Post

Classifying an electric semi as "emissions equipment" is a bit premature. They could feasibly outperform diesel; electric often does. The semi driver you spoke with might not be aware of just how much torque electric motors can generate; and torque is the name of the game when you're talking trucks.

Electric vehicles are also much more versatile in terms of form factor. A lower centre of mass can be achieved with greater ease -- crucial in this vehicle segment where stability and control are significantly sidelined due to the need for raw power. More torque means less complex gearing, no more gigantic complicated turbo's.. The list goes on. This IS an interesting move for the industry, whether crusty old drivers know that or not.

At the end of the day, semi truck drivers complaints will be immaterial anyway. The superior truck will win economically, whichever truck that happens to be. If Tesla designs a more cost effective semi, there will be drivers for them. And if not, autonomous semi's aren't far off anyway.

Easily comparable to forklifts. Going from gas to electric and slamming on the gas, holy crap those electrics can take off.
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post #46 of 334
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Quote:
Originally Posted by AmericanLoco View Post

The diesel engine in a semi is around 2000-3000 pounds. A comparable electric motor is going to weigh a substantial amount as well. Modern semis have engines around 600HP, and they use every bit of that going up hills. 600HP is 450 kW, which is an enormous amount of power and would require a battery pack atleast 10-15x the size of a Model S to have comparable range to a diesel fueled semi.

That's 18,000 pounds worth of batteries, and 18,000 pounds less cargo you can carry. That's a big deal.

As far as it being "like a sports car", any modern 600+ HP semi feels quick unloaded.

The motors in a model S weigh in at 350 pounds each... Bulk of the weight is the battery pack.

600HP that is it?

The Semi will obviously have dual motors and 700Hp like the Model X
post #47 of 334
Quote:
Originally Posted by Lady Fitzgerald View Post

Actually, Musk proposes swapping out the batteries in as little as 90 seconds (and demonstrated it) although 5-10 minutes would be more reasonable.

As far as the infrastructure goes, Musk is proposing starting with 1500 charging stations. That would probably limit use of the electric semis to the Interstate Highway system and destinations near the Interstates at first. Musk has the money (or can get it) to pull this off.

You really need to read the articles before commenting.

"Musk is proposing..." rolleyes.gif Now we just blindly take pitchmen at their word is it? Okie...
post #48 of 334
Smaller battery -> smaller capacity -> less energy to do work ->Less range other than that yeah smaller battery -> less weight -> less energy need to same amount of work -> more range.

You are totally ignoring or missing the point that the car only has to move itself and it's occupants whereas the semi in addition to itself and crew has to full a trailer that may or may not be loaded.
post #49 of 334
Quote:
Originally Posted by Mookster View Post

Classifying an electric semi as "emissions equipment" is a bit premature. They could feasibly outperform diesel; electric often does. The semi driver you spoke with might not be aware of just how much torque electric motors can generate; and torque is the name of the game when you're talking trucks.

Electric vehicles are also much more versatile in terms of form factor. A lower centre of mass can be achieved with greater ease -- crucial in this vehicle segment where stability and control are significantly sidelined due to the need for raw power. More torque means less complex gearing, no more gigantic complicated turbo's.. The list goes on. This IS an interesting move for the industry, whether crusty old drivers know that or not.

At the end of the day, semi truck drivers complaints will be immaterial anyway. The superior truck will win economically, whichever truck that happens to be. If Tesla designs a more cost effective semi, there will be drivers for them. And if not, autonomous semi's aren't far off anyway.

Electric motors generate maximum torque at zero speed, that's perfect for small vehicles like cars where you need the most torque to pull away from a stop. IC engines have more peak torque (but take longer to get to maximum torque), which is what you need for larger vehicles (particularly those carrying heavy loads).
post #50 of 334
Quote:
Originally Posted by SpykeZ View Post

Quote:
Originally Posted by Mookster View Post

Classifying an electric semi as "emissions equipment" is a bit premature. They could feasibly outperform diesel; electric often does. The semi driver you spoke with might not be aware of just how much torque electric motors can generate; and torque is the name of the game when you're talking trucks.

Electric vehicles are also much more versatile in terms of form factor. A lower centre of mass can be achieved with greater ease -- crucial in this vehicle segment where stability and control are significantly sidelined due to the need for raw power. More torque means less complex gearing, no more gigantic complicated turbo's.. The list goes on. This IS an interesting move for the industry, whether crusty old drivers know that or not.

At the end of the day, semi truck drivers complaints will be immaterial anyway. The superior truck will win economically, whichever truck that happens to be. If Tesla designs a more cost effective semi, there will be drivers for them. And if not, autonomous semi's aren't far off anyway.

Easily comparable to forklifts. Going from gas to electric and slamming on the gas, holy crap those electrics can take off.

I've driven 4000lb. sit-down and 2000lb. stand-up electrics (I worked in warehousing for 30 years) and you are right; they do accelerate fast although top speed was limited to conserve batteries. even with their lead/acid batteries, we often ran them all day before having to put them on the charger.
     
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