101–110 of 275 posts
Earlier quoted context omitted.
Lithium Battery 0.5 kWh/kg Diesel 12.7 kWh/kg
Diesel is more like 3.175 (25%) due to the inefficiencies of small heat engines. You're throwing away like 3/4 of the energy as waste heat. Electric motors are >95% efficient and lithium batteries are in the high-90s percent efficient. Electricity is already low-entropy, whereas energy from burning petrol is high entropy and thus contains less useful work.
Earlier quoted context omitted.
Flight will never be powered by electricity, so you can stop checking. Using synthetic liquid fuels for flight is the only currently-foreseeable path to carbon-neutral, long-haul passenger flight.
Long haul yes, but it's a little known story that regional airlines are on the edge of disaster because: (1) they can't find pilots, (2) manufacturers have stopped making the 50-seat jets that are the mainstay of that business. Airports like ITH are already at the top of the "regional development problems" in third-tier cities and it is not so clear they're going to be able to have service in 20 years the way things…
That seems like an odd comparison to me. Is it normal to compare the Top Tier Anything to the Average of another thing?
Top Tier Car 0-60 Times vs Average Car Costs? IDK, it doesn't seem to contain any REAL information. Shouldn't the comparison be the costs of the SAME cars and not include cars that aren't top tier?
What am I not getting?
Regarding price, leading manufacturers are already selling at a price below what was always understood as the point where EVs win in terms of economics: https://www.nextbigfuture.com/2024/01/ev-lfp-battery-price-w... The recent price war in China is a testament to that.
This is a great set of charts and analysis, although I have two problems with it. 1. On the chart of energy density, I'd like to see the the energy density of petrol for comparison. It's much higher, and even though extrapolation is dangerous, I'd like to see how long it could take to reach parity given some of the different forecasting models they mention. Specifically regarding their mention of air travel, I'd like…
> I'd like to see the the energy density of petrol for comparison. Petrol's higher energy density doesn't matter as much as people think. Electric vehicles are around four times as efficient as petrol. In a petrol car, only 20% of the energy is converted to motion. In electric cars, this is around 80% (with some variation dependent on regenerative braking). I wrote about this extensively in a previous article: https:…
Doesn't matter for WHAT? You start out talking about energy density, and then cite some numbers regarding efficiency. What does one have to do with the other? You've done nothing to support your opening claim here.
This is a great set of charts and analysis, although I have two problems with it. 1. On the chart of energy density, I'd like to see the the energy density of petrol for comparison. It's much higher, and even though extrapolation is dangerous, I'd like to see how long it could take to reach parity given some of the different forecasting models they mention. Specifically regarding their mention of air travel, I'd like…
The mention of air travel was strange. I wasn't aware of anyone who thought long range flight would ever be electrified. At least not without some fundamental breakthrough. S-curves are hard to predict. Basically every time someone attempts to do it, they are way off. This [0] is a neat paper that addresses the question. We've blown past every single prediction. [0] https://www.inet.ox.ac.uk/files/energy_transition_p…
I know almost nothing about this space. I would appreciate a comment on why this is feasible or not...
Chart #2: Top Tier Energy Battery Density vs. Battery Cost. That seems like an odd comparison to me. Is it normal to compare the Top Tier Anything to the Average of another thing? Top Tier Car 0-60 Times vs Average Car Costs? IDK, it doesn't seem to contain any REAL information. Shouldn't the comparison be the costs of the SAME cars and not include cars that aren't top tier? What am I not getting?
Chart #2: Top Tier Energy Battery Density vs. Battery Cost. That seems like an odd comparison to me. Is it normal to compare the Top Tier Anything to the Average of another thing? Top Tier Car 0-60 Times vs Average Car Costs? IDK, it doesn't seem to contain any REAL information. Shouldn't the comparison be the costs of the SAME cars and not include cars that aren't top tier? What am I not getting?
Actually, if you know the details of the development of consumer cars, you'll find that advances and levels of performance in top tier cars tends to trickle down into average cars. Not without some dilution, but that's a definite trend! So things like disc brakes, fuel injection, microprocessor control.
This sort of thing definitely happens with batteries over time. It's a way of peeking into the future. Just fudge factor for a little dilution.
Earlier quoted context omitted.
Currently used? Probably quite a bit. But usually still a net emissions win for using an EV vs a fossil fuel vehicle even with current grids. Required? None. There's nothing in EV battery production or charging or usage that requires burning fossil fuels. That fossil fuels are a major source of our current energy is part of the problem that we are also working to solve. And mass production of economical batteries is…
a quick check showed about 21 Billion Gallons annually to make 130k tons of lithium batteries are produced. so 273 billion kWh of hydrocarbon fuel burned to make batteries that can hold only 51.5 million kWh of energy. And then roughly a few billion or more to fill them up each year. What year will we make enough solar & wind power to compensate for the 21 billion gallons of fuel?
https://www.verifythis.com/article/news/verify/environment-v...
> David Checkel, a professor at the University of Alberta and an electric car expert, did some back-of-the-napkin math to dispute the claim. Checkel calculated that if each gallon of fuel costs $3, then 21 billion gallons would cost $63 billion annually. If $63 billion was the price tag for 250,000 batteries, then the cost of raw materials for each battery would be more than $250,000.