does anyone know the horsepower of the tesla roadster or any all electric vehicles.

If so could this enable the kwh requirements to be determined to travel 100 miles say

i am keen to create a picture of the impact which electric vehicles would have upon the electricity generation system in the future

the statistics for the number of vehicles being registered each year is recorded by the cc rating of the engine

this can easily be converted to hp for a modern car 15-17 cc = 1 horsepower so if the horsepower of an electric vehicle can be determined and the associated kwh to drive 100 miles say then it could be the most accurate prediction made in history

I know horsepower can be converted into kw simply by multiplying the horsepower by 0.746

the question is how do you convert this figure into the required battery capacity or the kwh to travel 100 miles and obtain a reasonable answer for the question

It depends a lot on how you drive, but 25 kWh for 100 miles might be about right for some people in a Leaf sized car.

GM has consistently said the Volt will do 40 at least miles on the EPA's city and hwy cycle tests using their 8kwh discharge window. Most predictions are that this will turn out to be about 36 miles, real world. So, for very low power hungry vehicle like the Volt we're looking at roughly .222kwh/mile of battery output. Figure about 10% losses after the wall socket, so the Volt achieves about .244kwh/m (24.4 kwh per 100m) real world grid energy. Ambulator's 25kwh per 100miles seems pretty accurate for first gen EVs real world grid draw. Down the road, there will be some component efficiency gains but vehicle size will offset this and the EV fleet average consumption will rise.

I've been looking into this method of determining the power consumption of electric vehicles and the official figures I have came across indicate that the
tesla roadster has an efficiency of 275wh/mile at 65mph it weighs 1238kg
think city 377wh/mile and weighs 1203kg with 2 passengers
and from info from the makers of tango which weighs 1428.8kg but does 250wh/mile
so im figuring that the aerodynamics could be playing a role here with these figures else the think city figures have been carried out whilst the car has had the heating and the lights on what do you think?

think city 377wh/mile and weighs 1203kg with 2 passengers
I see the Think City being said to have a 28.3, 27, 19, or 18 kWh battery pack, and a range of 112 (18 kWh) or 125 miles. The energy use implied would be less than 227 Wh/mile, and probably quite a bit less. This would be on a low speed cycle, which is all the City is really designed for. If you could get it to go 65 mph it would probably be rather inefficient.