Re: [EVDL] Converting from watt-hours/mi. to mi/gal & back

622 Views 0 Replies 1 Participant Last post by EVDL List, Sep 10, 2007

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Discussion Starter · Sep 10, 2007

Re: [EVDL] Converting from watt-hours/mi. to mi/gal & back

Obviously, we can kick around the whole "What about
the supertankers bringing the oil?" and "What about
the heating to separate the hydrocarbons into gasoline
in the fractional distillation process?" "oh yeah,
versus the efficiency loss of the electricity sent
over the lines?" as is done on the list all too
often. But for the sake of a down-&-dirty
comparison, it is reasonable to assert that EVs are
more efficient than ICE and say that 300 wh/mi. vs.
1100 wh/mi. means that I'm 72% more efficient. Or,
I'm at least 55 mpg gas equivalent.

--- Morgan LaMoore <[email protected]> wrote:

> Peter VanDerWal <[email protected]> wrote:
> > It's not that easy.
> >
> > It's not a this equals that formula.
> >
> > You have to take into account the efficiency of
> the ICE and the efficiency
> > of the EV drive system.
>
> No, you don't. That's the point: the comparison of
> power in per mile
> *is* a comparison of the overall efficiencies of the
> ICE vs. EV. Not
> just motor efficiency vs. engine efficiency, but
> also including drag
> and mechanical friction. Using the direct conversion
> factor, you are
> looking at how much energy you put into the car to
> travel one mile.
> Not how much of the energy is actually used by the
> car (factoring in
> efficiency), but how much you have to put in.
>
> With the ICE at 32 mpg, you put in 36 kWh and you
> travel 32 miles,
> giving you about 1100 Wh/mile.
>
> With an EV, you put in 300 Wh of electricity and you
> drive a mile. The
> EV thus takes 300 Wh/mile.
>
> -Morgan
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>

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