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Strategies & Market Trends : Booms, Busts, and Recoveries

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To: gg cox who wrote (69198)	5/9/2008 12:49:26 AM
From: Maurice Winn	Read Replies (1) of 74559

Total cycles of 10,000 is a LOT. City cars lasting for 10 years would need battery replacement say 200 times a year = 2000 times. Even if, for example for taxis, they were replaced daily or slightly more than daily, that would only be 4000 times. So a vehicle could use the same batteries for 20 years, replacing them daily, and still be within the life of the VRB battery. That means the capital cost of the battery could be spread over a long time and over a LOT of refills. Vanadium and sulphuric acid are cheap materials, so the VRB batteries should be cheap to make. Comparable with lead acid and lithium ion batteries I guess. Half the energy density of lead acid batteries isn't necessarily a show stopper, though it's quite a disadvantage. By 1800 W/kg, I guess you mean watt-hours/kilogram, in which case lithium ion batteries are vastly better than VRB types, even if the capital cost of lithium ion types is quite a lot more. I suppose VRB is keen to get their batteries in use in vehicles, so if they say they are unsuitable, then it's a good bet they are unsuitable. Mqurice

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