bowlofsalad wrote:Also, by this rationality, at around 15 cents per kwh comes out to about 5 dollars per 33.4kwh or per 'gallon' of electricity. We all talk about how cheap electricity is, perhaps were talking about how efficient our ebike setups are instead.
dogman wrote:Your calculation sounds more accurate to me. It shows the ebikes efficiency more accurately. Even my horribly inefficient longtail going 30 mph still gets 800mpg by that method. I get about 40wh/mi full boogie.
You are right, it's not that electricity is so cheap, it's that so much less of the wh is made into heat in electric motors. It's why you don't see big gas engines running stuff in factories. Big huge electric motors are much cheaper to run and maintain.
Dauntless wrote:100 miles driven x 33.7 kWh ÷ 34.0 kWh = 99 MPGe
http://www.epa.gov/otaq/carlabel/electr ... more.htm#2
Dauntless wrote:Funny you bring that up, there are those who say that we should figure how much gas is used per mile. You're using all the same caculations, just in a different order. But that's an EPA style calculation I posted.
Oh, and about having that much power in your battery pack: That's the WHOLE REASON that electric cars are a struggle. You take out a 16 gallon fuel tank and put a 370 volt/1,500 amp battery in its' place, LiFePO4 that physical size couldn't cost all THAT much, I'd say you'd be able to build your LA to SF and back on a single charge car that some people could actually afford. In fact if the Tesla Model S really can go 300 miles with the 85kW battery, we'd be talking 2,000 miles, right?
How physically large would a 550kW battery have to be? What would it weigh? (Gulp)
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