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Aussie first in EV Heavy Haulage, page-50

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ramAustralia

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24/01/22

16:09

Post #: 59093946
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Originally posted by lucky 992: ↑

Yes, there are some pretty basic laws of physics that put ev anything on the backfoot before you even "turn the key"

The acceleration argument is the most ridiculous argument that is brought up. The whole ev argument is based around emissions. How the hell do you reduce emissions while promoting faster acceleration? It is a negative sum argument. In fact it is exponentially negative. I ran less than 2 second 60 ft 100km/h times 30 years ago so I know exactly how much energy and money it takes to achieve this.
Range is another. The more range the bigger the battery. This means heavier batteries at the moment, with heavier running gear to carry it all, and the greater tyre wear suspension and steering gear wear that goes with the weight.
This also decreases the safety factors of stopping distances handling and bigger fires to not be able to extinguish etc.
The power density of batteries are at least 60 times less power dense than fuel. Not 2% or 5% or even 10%........., but 60%
As well as this huge disadvantage, as the battery discharges, the energy consumption increases in relation to the vehicle weight, the fuel density and the distance travelled.
If you want to double the power you need to double the weight, of the battery, pretty much.

You can double the power of an ice unit with associated increases in efficiency with very little increase of weight.
As an ice fuel load decreases the fuel consumption goes down in relation to miles travelled as well as fuel density.

The solar panels for charging is one of the most hilarious arguments I have ever heard of...... Obviously very very few live off grid and realise just how much energy goes into running the average home. If you do even the most rudimentary calculations of how much power would be consumed by a rig weighing in at close to 40 tonnes and running at 100m/h 8-12 hrs per day (OR 24 hrs per day autonomous as the dreamers of the world would have us believe), then you would get a very basic idea of the area that would need to be covered by solar panels to achieve this. Then multiply this by HOW Many? rigs running up and down the eastern seaboard alone.....
A lot of work needs to done yet to make them viable.

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Liquid fuels have the big advantage they don't have to carry their "oxidizer" around with them so around half their energy they get from the atmosphere for free with no weight disadvantage. Battery powered electric vehicles do have some advantages with regenerative braking and the ability to better match power coupling to motion (i.e. same as electric locomotives). I can see electric vehicles becoming dominant in highly trafficked cities, but it would be a long time before they could compete in long distance haulage. There they would also be competing with fundamentally more efficient rail, which is also easier to electrify.
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