On Mar 8, 12:54*pm, "Nev.." <id...@mindless.com> wrote:
> theo wrote:
> > I wonder how much you lose on the transfer in charging the vehicle and
> > then feeding it back to the grid though. I would think probably in the
> > order of 20% or more. This loss is literaly going up in smoke.
>
> > I try to mange my home power as best I can. My meter reads power used
> > by time of day/rate and power fed back into the grid by my solar
> > cells. I read it daily. OK, I'm retired and need to fill in my time.
> > My currrent daily usage is around 20-24Kwh per day, with close ot 45%
> > at off-peak rates and less than 10% at peak rates (the solar panels
> > mostly generate power at peak rates). My power costs for February was
> > $3.47 per day. An electric car would likely double that usage. Just
> > how much does an electric car use per km? At what speed. For me, an
> > electric vehicle would need to be able to travel 100+ kms between
> > charges with half of the distance at highway speeds. To drive my ute
> > 100 kms costs $11.40, and burns no coal.
>
> Coal/oil? *I think the search for renewable alternative fuels treats
> coal or oil similarly, that is, I don't think that you need feel good
> about anything because your car burns no coal. *In fact, I think coal is
> preferable power source to oil because production of power from coal in
> a power station is much more efficient and less polluting than that from
> oil-based fuels in a car engine. *It's the only reason why electric cars
> can make environmental sense in the present time.
How about this then
http://www.mrsharkey.com/charging2.htm
While studies of the pollution-reducing ability of electric vehicles
in California are quite favorable, they cannot be applied to the rest
of the world as a whole. The truth is that when using electricity
generated from dirty sources such as coal and oil, electric vehicles
may actually create more of some pollutants than comparable internal
combustion engine vehicles. A report by the U.S. General Accounting
Office (GAO) cited a German study that estimated the environmental
impact of electric vehicles with two distinct energy mixes: one
comprised of only 49% coal-fired electricity, and one comprised solely
of coal-fired electricity [1]. The estimates provided by the study are
given in table 1. Assuming that 49% of an electric vehicle's charging
energy being derived from coal, the study found that electric vehicles
would cause comparable levels of nitrogen oxides and carbon dioxide to
be emitted, and that sulfur oxide emissions would increase by a factor
of 10 [1]. Furthermore, when assuming that an electric vehicle is
charged with 100% coal-fired electricity, the study estimated that the
electric vehicles would emit 150% more carbon dioxide, 250% more
nitrogen oxides, and 2400% more sulfur oxides than a comparable
internal combustion engine vehicle [1].
[1] Electric Vehicles: Likely Consequences of U.S. and Other Nations'
programs and Policies. (1994). In Gateway Japan. [20 November 1995].
I think Oz grid electricity production is around 80% coal.
Theo