crotchety’s Recent Comments

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  Plug-in Hybrids with Vehicle-to-Grid (2)

  GreyFlcn:  Sorry about my bout of unwarrented (sic) hysteria. I'm just about calmed down now.

  On reflection I guess what bugs me is the idea of me as an individual sucking, say, 10kWh out of the grid at night , only to turn around and put back in, say, 6kWh during the day; the rest going up as heat. Then I'm to regard this as an unqualified "good".

  I guess it's just an emotional view rather than a technical one. We hysterics tend to be that way.

  Cheers!On Google.org funds V2G demonstration projects posted 2 years, 5 months ago 17 Responses

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  Plug-in Hybrids with Vehicle-to-Grid

  As a devotee of conservation and tech solutions thereto it pains me to throw cold water on ideas like this one. But...
  Grid-to-battery-to-grid energy conversion is not 100% efficient.
  viz:
  Charger/inverter efficiency AC-DC <100%  (it gets warm)
  Battery charge efficiency <100% (it gets warm)
  Battery discharge efficiency <100% (it gets warm)
  Charger/inverter efficiency DC-AC <100% (it gets warm)

  In my just-invented new age math: 4 x <100% = <<100%

  And don't get me started on battery wear-and-tear from all those extra charge-discharge cyles!

  Now maybe we could save a few shekels with peak pricing of electricity. And maybe we could shave peak demand (fewer power stations). But does it all add up?  I confess I don't know. But I like my Prius the way it is for now.On Google.org funds V2G demonstration projects posted 2 years, 5 months ago 17 Responses