Max S. Dunn

Plugin 2010: Future of Charging

Posted by: Max Dunn on July 28, 2010 13:34:56

AC vs. DC, slow vs. fast – the outlook for charging technologies

• Gery Kissel, Chevrolet
• Ron Thompson, Eaton Corporation
• Takefumi Anegawa, TEPCO
• Kristen Helsel, Aerovironment
• Ralf Ostreicher, Daimler AG

Gery Kissel, Chevrolet

• Most charging done at home, then at workplace, only a small amount of fast, public charging
• Charging Levels
  • AC Level 1: 120V, 12, 16 amp, 1.44 kW, 1.92 kW
  • AC Level 2: 240 V, <80 amp, 19.2 kW
  • AC Level 3: ?
  • DC Level 1: 200-450V, <80 amps, 19.2 kW
  • DC Level 2: <200amp <90kW
  • DC Level 3: ?
• DC Level 2 coupler will have J1772 at the top and then two DC connectors at the bottom

Ralf Ostreicher, Daimler AG

• Europe connector Type 1 is IEC 62196-2 which similar to J1772 but limited in current
• Type 2 connector used for Level 3 AC charging
• Estimated charging levels needed
  • Low power AC: 80% charging at home and work
  • Medium power AC: 18% for several hour charging
  • High power DC: charging 2% of the time, fast cahrging
• 62196-2
  • Is a floating cable - so cable doesn't stay attached in a public space where it can be vandalized
  • Can handle 13A up to 70A, single or three phase

Takefumi Anegawa, TEPCO

• In Oct 207 mileage was 203km. Driver understood EV performance but were reluctant to use it. In March 2008, installed DC fast charger, then drivers drove 1427 km (?)
• 3 Phase and DC risk of short circuit is significantly higher 
• CHAdeMO DC connector being designed

Kristen Helsel, Aerovironment

• Believes that DC fast charging will be the "killer app" that enables EVs