• 5 Posts
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Joined 3 years ago
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Cake day: June 18th, 2023

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  • Usually I mention Poe’s law when sarcasm isn’t indicated, but in this case it’s so obvious it isn’t necessary.
    It’s really strange how hydrogen was all the rage 20 years ago, and everybody invested heavily in this new technology for the future.
    All physicists I heard commenting on it, were 100% sure hydrogen is the future? Despite the obvious problems of energy loss making hydrogen, which is still only 50-70% efficiency, against 90% efficiency charging a battery. And then on top of that the fuel also loses about 50%!! Making the net efficiency of the total system only about 25%. Where batteries easily have more than twice that.
    I’m guessing in the future that to cover our needs from renewable, we will need to have enormous surplus production, and at that point hydrogen will be great, because enough hydrogen can be made from energy that would otherwise be wasted, to cover our transportation needs.
    So maybe another 10-20 years?















  • A 10 MW project is considerably more complex than a 1 MW project

    No it’s not, it’s perfectly linear compared to what we are already doing. And is probably cheaper to install than the battery swap stations, and for sure cheaper to run once installed.
    Charging stations with more than 30 400 kW chargers are already common here.
    Making the chargers more powerful does not really increase power demand much, because charging is done quicker requiring fewer stations, to handle the same amount of customers. Also these fast chargers can be installed gradually, because not everybody can utilize the high power. But despite of that, we see these stations with 30+ 400 kW chargers, despite very few today can utilize 400 kW, if these were expensive to install, I think there would be a much greater mix of less powerful chargers.

    We are transitioning to electricity in general, both regarding heating houses where installation of heat pump systems are currently subsidized, and electric cars that are now 80% of sales here, and finally we have a lot of Data Centers in Denmark because they want green energy that we can supply.

    So the electric grid is already being heavily expanded to meet all these demands, although the heavy demand for data centers have caused the waiting time to go up.

    I may be wrong, but without mandatory standardization, I don’t think battery swap is where the future is at, as cool as that might be.


  • Everything you write is as true for 1.5 MW compared to old 150 kW chargers.
    First of all if you charge 3 stacks at a time, you can use the same cables but having 3 of them.
    Second you can double the output on the same cables by going from 800 volt to 1600.
    So in response I’d say that the Truck could even charge at 10 MW with higher voltage batteries, using multiple battery stacks.

    Your argument is as naive as if I claimed CATL can’t switch 3 batteries simultaneously, because that would require 3 machines to perform the switch.



  • Battery swap is kind of cool because a swap is super fast with the newest swap stations.
    (Disclaimer not by personal experience, only as seen in reviews.)
    But it seems that for it to have any future, there needs to be strict standards bodies for it. Otherwise the logistics will never reach a point to make it feasible at scale.
    With chargers getting very fast too, the advantage of swapping is diminishing while the costs are not.
    This is the case for normal cars, but I guess it’s not much different for trucks.
    BYD has batteries now that can charge at 1.5 MW for a normal passenger car, and CATL too is at least at 1.3 MW last I heard.
    The special equipment used for trucks should be able to go way higher, like they pump diesel way faster than normal cars under high pressure.

    Swapping is great because the battery can be changed quickly, without the harm of charging quickly.
    But without standardization the logistics will be a nightmare, and probably prohibitively expensive.