Tesla semi

[two_bit_score]

Humm. How do they recharge those batteries on those stealthy Russian subs?

Diesel engines. They are vulnerable when running the engines at surface level to recharge the batteries.

 

[dynasim]

I read the first couple of posts, became utterly disgusted, and had to comment. I refuse to read the rest.

One has to be completely unaware of how things actually work to propose such tripe as a tractor trailer run on batteries. Seriously, this is the thing that finally convinced me that Musk is an utter and complete fraud.

The amount of energy required to move a 40 tons of material at highway speeds for long distances eliminates batteries as the source of energy. For the OP to suggest that truck mounted solar panels, and/or a wind turbine is going to recharge those batteries is looney. I don't use that word lightly. These sorts of people were in charge of our energy policy until 9 months ago. That thought makes me tremble.

Perhaps the next thing we can do is send a person to mars using sling shots wound up by wind turbines.

uggh.

 

[two_bit_score]

Musk will peddle any scheme he can get the government to finance.


Underground high speed trains, trips to the moon, Tesla semi's, on and on....

 

[California]

There are people out there who know more about these things than we armchair theorists.

======quote====source=====

U.S. astronaut Scott Kelly is a veteran of four space flights. He holds the record for total accumulated days in space, as well as for the longest single mission by an American: a full year aboard the International Space Station (ISS). He clearly knows a thing or two about what's possible in the realm of space flight, and he just told the world he doesn't doubt Elon Musk.

"When Elon Musk said he was going to launch his rocket and then land the first stage on a barge, I thought he was crazy" Kelly said on Tuesday. "And then he did it. I'm not going to ever doubt what he says, ever again."

 

[two_bit_score]

:laughing:^^^^^^^^

 

[Redneck in training]

Humm. How do they recharge those batteries on those stealthy Russian subs?

They have stationary bicycles with generators and every man has to pedal for few hours every day. It keeps them in shape and the batteries charged. I think that is what they do. I might be wrong about that.

The whole point of nuclear power is that the sub can stay underwater for very long time so nobody knows where it is. The Russians have submarine port in Sevastopol that is underground so nobody sees the subs going in or out.
I have a relative who used to be a supply officer on a sub. He told me that food supply is only limitation how long the sub can stay submerged away from the port or supply ship.

 

[daugen]

I read the first couple of posts, became utterly disgusted, and had to comment. I refuse to read the rest.

It's too bad you didn't keep reading. New technology requires a lot of brainstorming, that's what this is about.
And some of us enjoy doing that. Clearly you don't.

There is an odor in this thread that is simply unpleasant.
even with ignoring two of the real geniuses in this group, this topic seems to be a magnet for alt right anti everything people.
I have no desire to have a conversation with these folks anymore. Some of you are unpleasant and simply nasty people.
For the first time since I joined TBN, I am unsubscribing from my own thread.
The spoilers have succeeded. The mosh pit has risen to the surface and nastiness prevails.

Unsubscribed.

 

[houstonscott]

I read the first couple of posts, became utterly disgusted, and had to comment. I refuse to read the rest. It's too bad you didn't keep reading. New technology requires a lot of brainstorming, that's what this is about. And some of us enjoy doing that. Clearly you don't. There is an odor in this thread that is simply unpleasant. even with ignoring two of the real geniuses in this group, this topic seems to be a magnet for alt right anti everything people. I have no desire to have a conversation with these folks anymore. Some of you are unpleasant and simply nasty people. For the first time since I joined TBN, I am unsubscribing from my own thread. The spoilers have succeeded. The mosh pit has risen to the surface and nastiness prevails. Unsubscribed.

Electric cars are a hard sell, so is man made GW caused by CO2 emissions from USA alone, the driving reason behind the push to switch to electric, and especially when the flag ship electric car company has never turned a profit and its cars are crappy. So if you want to discuss electric cars, and demand a switch, you better come prepared to defend "why".

 

[lostcreekranch]

There are people out there who know more about these things than we armchair theorists.

======quote====source=====

U.S. astronaut Scott Kelly is a veteran of four space flights. He holds the record for total accumulated days in space, as well as for the longest single mission by an American: a full year aboard the International Space Station (ISS). He clearly knows a thing or two about what's possible in the realm of space flight, and he just told the world he doesn't doubt Elon Musk.

"When Elon Musk said he was going to launch his rocket and then land the first stage on a barge, I thought he was crazy" Kelly said on Tuesday. "And then he did it. I'm not going to ever doubt what he says, ever again."

Scott Kelly has 520 days in space but, Peggy Whitson has 534 days.

Astronaut Peggy Whitson Sets NASA Record For Most Days In Space : The Two-Way : NPR

 

[SPYDERLK]

Average refinery turns out about 19 gal of gasoline and 11 gal of diesel from 42 gal (1 barrel) of crude.
The refinery consume about 7 kWh/gal of fuel to do so.

1 barrel of crude oil is equivalent to 1675.5 kWh of energy.
Refinery produces about 19 gal of gasoline equivalent to 644.6 kWh
Refinery produces about 11 gal of diesel equivalent to 417 kWh
Refinery uses about 7.4 kWh/gal to produce the fuels. Since the 7.4 kWh was generated at about 38% efficiency the actual energy consumption per gallon is 7.4/0.38=19.5
Sum it together:
(644.6+417-(19+11)*19.5)/1675.5=27.9 % efficient
ICE is about 20% at the best day.
Therefore it converts 20*.279=5.6% energy contained in the crude when it reached the refinery.

Average coal burning plant is about 36% efficient, combine cycle plants are pushing 65-70%, Average efficiency of fossil fuel power plant is about 38%. The total efficiency of all power plants combined is somewhat higher but I don't have the number.

The charging cycle of Li-ion batteries is about 99% efficient.
The electronics used to charge the batteries has about 96% efficeincy
The drive motors for cars are about 92% efficent.
To sum it up:
38*0.99*0.96*0.92=33.2% of fuel energy is converted to power.

This assumes the car mechanical losses and energy transportation cost are about the same. The fact is that transportation of electric energy is cheaper but I don't have the numbers.

33.2/5.6=5.92 E cars is about 5.92 time better user of energy.

Even if you use the best scenario of the refinery efficiency and the worst scenario of efficiency of electric power generation the ecar comes 5 times better.
Additionally as the lights are converted to o LED the coal power generation will need the ecars as night load. They will have hard time to stay in business without ecars or utility size energy storage.
Also if ecars are deployed in mass numbers oil might hit 10/barrel. Wouldn't it be nice for you ICE lovers?

As you know KWh implys electricity, but is actually generic energy. In the case of the refinery this would, in high proportion, be strictly heat. One of the beauties of huge scale is the favor toward adoption of efficiency. -- Are you sure that the heat is derived from electricity? ... If not that 38% could be much improved by direct use of some of the crude as heat fuel.

That would lessen the advantage of electric in the Energy/mile comparison youve calculated.​