3 ms·

So about half the energy density of methanol, which is already not good enough for long range trucking. Gotcha.

• SigmundA 5y ago
  I thought we where talking about hydrogen which is 2800 wh/kg not methanol which will produce CO2 when used. Now your fuel cell needs 100% conversion to get that energy density in electrical form. Goal post moved, got it.
  • darksaints 5y ago
    No, we were talking about batteries, and how the theoretical limits of battery energy density isn't even close to the energy density required by long haul trucking. You triumphantly declared that Lithium Sulfur has a theoretical max (which you'll never get to, BTW) of 2600 wh/kg. I used that opportunity to compare it to Methanol, which has already been proposed as a green fuel (it is a common form of biofuel), and already discarded by the long haul trucking industry due to energy density concerns. If methanol isn't good enough, batteries aren't even close. I don't know if you are getting your Hyrogen facts from some special Cult of Elon fact repository, but you're wrong. Again. Hydrogen is 39000 wh/kg, not 2800. That's why it is a potential solution, where batteries never could be.
    • SigmundA 5y ago
      Aren't you forgetting the weight of the high pressure tanks and fuel cell and heat recovery turbine in your energy density for hydrogen? A battery has power leads coming off of it, hydrogen doesn't, should I quote electrons wh/kg instead? I did make a mistake though I believe the in development hydrogen fuel cell I got the number from was only 1800 wh/kg, my bad. If batteries can reach 2000 wh/kg then a 4 megawatt-hour battery would be around 5000 lbs and give 2000 miles range, it would be on par with current diesel drive trains.