Comment on Teslas have been consuming a lot of gasoline lately.

• ascense@lemm.ee ⁨1⁩ ⁨year⁩ ago

  Last I ran the numbers, it seemed like on paper charging off an industrial scale generator was around 20-30% more fuel efficient per km than directly running an ICE car, but I based it on the advertised efficiency values of a random average seeming diesel car, compared to rather pessimistic charging loss and efficiency numbers for the EV. The inefficiency of even modern ICE cars is quite astonishing, even compared to the engine in a generator that can constantly run at the optimal RPM and load for efficiency.

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• SpaceCowboy@lemmy.ca ⁨1⁩ ⁨year⁩ ago

  A charging station operating on 100% diesel to power an EV is much less efficient than a modern ICE vehicle of a similar mass sans batteries.

  Citation needed. Do ICE engines not get hot and therefore also have great losses because of waste heat?

  Presumably a generator making electricity for a charging station would only run when electricity is needed, while an ICE engine would be losing energy to heat the entire time the vehicle is idling in traffic.

  Why would a diesel generator not be made to efficient and why are ICE engines always made to be efficient? How do you know which kind of generator they were using? Why would they use the generator for 100% of the energy needed?

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  • vxx@lemmy.world ⁨1⁩ ⁨year⁩ ago

    Yes it gets also hot, but the battery as well, during charging and using.

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  • rtxn@lemmy.world ⁨1⁩ ⁨year⁩ ago

    Keeping in mind that this is a hypothetical scenario and that I did point out that the overall efficiency is dependent on how much of the power is generated by renewables and how much by the on-site diesel generator:

    • An ICE skips the conversion to electricity and its storage.
    • An ICE vehicle weighs less because it doesn’t have batteries (see this chart to compare the energy density (MJ/kg, horizontal axis) of lithium batteries to gasoline and diesel)
    • There is a point in the diesel/solar ratio at which the system’s overall efficiency is higher with an EV than an ICE, but I don’t know where that is because, once again, you’re pissing yourself over a hypothetical scenario.

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    • Bytemeister@lemmy.world ⁨1⁩ ⁨year⁩ ago

      It doesn’t really matter actually. Electric motors are so much better at delivering power, that you will get more range from a gallon of gas by towing an ‘flat battery’ EV behind a truck and then driving the EV than you will just driving the truck without towing the EV.

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      • evulhotdog@sh.itjust.works ⁨1⁩ ⁨year⁩ ago

        Doesn’t that highlight the torque that is available and delivered, more than efficiency of the electric motors, charging, heat losses, etc.?

        There has to be a better example to prove your point than this.

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