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To: Aaron Cooperband who wrote (70511)	1/5/1999 1:39:00 AM
From: nihil	Read Replies (1) \| Respond to of 186894

Total system energy consumption of electric cars All this is guess work half-remembered from a distant past: The overall efficiency of an urban electric plant is about 45%. The overall efficiency of an electric motor is very high -- 75-95% There is energy storage and conversion loss in batteries. 25% Ground friction and transition loss. 5-10% .45 x .8 x .75 x .90 = 24.3 % +/- 10 % points == possibly three times as direct energy efficient as ICE car, leaving aside up stream energy -- digging mines, building power plants, refineries and oil fields. Check some of the old work of energy systems groups of the 1970's and 1980's. See the work Bruce Hannon who pioneered this kind of systems analysis. staff.uiuc.edu