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kchangnyt's profile
Kenneth Chang
Kenneth Chang
Kenneth Chang
@kchangnyt

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Kenneth Chang

@kchangnyt

Science reporter at the New York Times. Pluto, dinosaurs, NASA, viral math & more...

New York, NY
nytimes.com/by/kenneth-cha…
Joined April 2014

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    1. Kenneth Chang‏ @kchangnyt 3 Dec 2014
      Replying to @Robotbeat

      @Robotbeat @MissionC2 @nytimes Batteries getting cheap but still not good enough unless people give up SUVs, minivans, pickup trucks.

      2 replies 0 retweets 0 likes
    2. Robotbeat 🗽 🖖🏾‏ @Robotbeat 3 Dec 2014
      Replying to @kchangnyt

      @kchangnyt @MissionC2 @nytimes What's wrong with an electric SUV, minivan, or pickup?

      1 reply 0 retweets 0 likes
    3. Kenneth Chang‏ @kchangnyt 4 Dec 2014
      Replying to @Robotbeat

      @Robotbeat @MissionC2 @nytimes Too heavy, no range. Energy density of Li-ion is too low, can't scale to large vehicles. Physics, not $$

      3 replies 0 retweets 0 likes
    4. Robotbeat 🗽 🖖🏾‏ @Robotbeat 4 Dec 2014
      Replying to @kchangnyt

      @kchangnyt @MissionC2 @nytimes I am a physicist, I know physics. If vehicles can burn gasoline or diesel, then they can be battery powered.

      1 reply 0 retweets 0 likes
    5. Kenneth Chang‏ @kchangnyt 4 Dec 2014
      Replying to @Robotbeat

      @Robotbeat @MissionC2 @nytimes Show me the math. How many 1000s of pounds of batteries, how efficient pushing that weight?

      1 reply 0 retweets 0 likes
    6. Robotbeat 🗽 🖖🏾‏ @Robotbeat 4 Dec 2014
      Replying to @kchangnyt

      @kchangnyt @MissionC2 @nytimes about 2 miles per kWh, 300Whr/kg and 330kg of batteries is 200 mile range. Replaces heavy combustion engine.

      1 reply 0 retweets 0 likes
    7. Kenneth Chang‏ @kchangnyt 4 Dec 2014
      Replying to @Robotbeat

      @Robotbeat @MissionC2 @nytimes Where do you get 2 miles per kWh? Independent of weight and aerodynamics?

      3 replies 0 retweets 0 likes
    8. Robotbeat 🗽 🖖🏾‏ @Robotbeat 4 Dec 2014
      Replying to @kchangnyt

      @kchangnyt @MissionC2 @nytimes Who says weight (or even aero) is fixed? Why not an aluminum chassis or even carbon fiber?

      1 reply 0 retweets 0 likes
    9. Kenneth Chang‏ @kchangnyt 4 Dec 2014
      Replying to @Robotbeat

      @Robotbeat Electric RAV4 100 miles range w/ Tesla batteries. Not obvious to me it's easy to build electric Highlander with 2x range.

      3 replies 0 retweets 0 likes
    10. Robotbeat 🗽 🖖🏾‏ @Robotbeat 4 Dec 2014
      Replying to @kchangnyt

      @kchangnyt If it were obvious and easy, not so sure Tesla would be interested in it.

      1 reply 0 retweets 0 likes
      Kenneth Chang‏ @kchangnyt 4 Dec 2014
      Replying to @Robotbeat

      @Robotbeat Why are Tesla's batteries only 150 Wh/kg? Not obvious that you can get to 300 in production battery. Elon said as much at MIT.

      9:33 AM - 4 Dec 2014
      3 replies 0 retweets 0 likes
        1. Robotbeat 🗽 🖖🏾‏ @Robotbeat 4 Dec 2014
          Replying to @kchangnyt

          @kchangnyt The cells used to make them are 230Whr/kg.

          0 replies 0 retweets 0 likes
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        1. Robotbeat 🗽 🖖🏾‏ @Robotbeat 4 Dec 2014
          Replying to @kchangnyt

          @kchangnyt We were talking physics, not production, remember! But anyway, the cells Tesla uses have specific energy of 230+Wh/kg.

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        1. Robotbeat 🗽 🖖🏾‏ @Robotbeat 4 Dec 2014
          Replying to @kchangnyt

          @kchangnyt Anyway, we will eventually get to higher energy battery tech for production, but it takes development time.

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