12-08-2008, 04:39 PM
JWFITZ:
Maybe you are thinking of energy DENSITY when saying "Electricity isn't a quarter of as efficient as straight up petrol."
In energy density gasoline beats BATTERIES. I Never said otherwise. But energy density should not be confused with energy efficiency. Energy density does not factor into the claims I have made.
An oversimplified way of understanding energy density vs. energy efficiency.
My gas car goes 300 miles on a tank of gas but its twin electric version only goes 150 miles on a full charge.
Thats ENERGY DENSITY. Gas car wins.
Same gas car takes 10 gallons (330kwh) of gas and costs $25 to go 300 miles but its twin electric version takes only 70kwh and cost only $8.40 (@ national average electric rates)to go 300 miles.
Thats ENERGY EFFICIENCY. ELECTRIC car wins.
As to the "9KW vehicle" you are talking about. I was referring to an electric vehicle using 9.1KWH of ENERGY to go 55 miles not the size of a motor or "vehicle".
The superiority of the electric car in FUEL to WHEELS EFFICIENCY is not an opinion, it is a FACT. Nearly three times more efficient.
Maybe you are thinking of energy DENSITY when saying "Electricity isn't a quarter of as efficient as straight up petrol."
In energy density gasoline beats BATTERIES. I Never said otherwise. But energy density should not be confused with energy efficiency. Energy density does not factor into the claims I have made.
An oversimplified way of understanding energy density vs. energy efficiency.
My gas car goes 300 miles on a tank of gas but its twin electric version only goes 150 miles on a full charge.
Thats ENERGY DENSITY. Gas car wins.
Same gas car takes 10 gallons (330kwh) of gas and costs $25 to go 300 miles but its twin electric version takes only 70kwh and cost only $8.40 (@ national average electric rates)to go 300 miles.
Thats ENERGY EFFICIENCY. ELECTRIC car wins.
As to the "9KW vehicle" you are talking about. I was referring to an electric vehicle using 9.1KWH of ENERGY to go 55 miles not the size of a motor or "vehicle".
The superiority of the electric car in FUEL to WHEELS EFFICIENCY is not an opinion, it is a FACT. Nearly three times more efficient.