Hello Jim,
Sometimes about once a week I may have to stop when going to a shopping
center. I can travel over four miles on frontage roads off the main roads
and the roads in front of the shopping center shops which has no stop
lights.
If I have to go to many stores along this route, I just go from parking lot
to parking lot for that distance. It is sure nice to see the battery ampere
usage is only 5 to 30 ampere usage. I am normally driving in 1st gear with
a overall ratio of 19.5:1 which keeps the motor rpm up to about 4000 to 5000
rpm.
Roland
----- Original Message -----
From: "Jim L" <
[email protected]>
To: "Electric Vehicle Discussion List" <
[email protected]>
Sent: Friday, October 12, 2007 12:34 PM
Subject: Re: [EVDL] kw and mpg conversion?
> No stop lights? No traffic? Can I come live with you. I am in Vancouver BC
> Canada, rush hour(week?) across the bridge near my house almost never
> stops.
> As for stop lights. The local city planners response to anything is
> another
> traffic light.
> The idea around here seems to be if all the cars are parked in traffic
> jams
> you won't have as many injuries in auto accidents!
>
> ----- Original Message -----
> From: "Roland Wiench" <
[email protected]>
> To: "Electric Vehicle Discussion List" <
[email protected]>
> Sent: Friday, October 12, 2007 11:21 AM
> Subject: Re: [EVDL] kw and mpg conversion?
>
>
> >
> >
> >
> > ----- Original Message -----
> > From: "Jim L" <
[email protected]>
> > To: "Electric Vehicle Discussion List" <
[email protected]>
> > Sent: Friday, October 12, 2007 11:23 AM
> > Subject: Re: [EVDL] kw and mpg conversion?
> >
> >
> > > Would that 300 watts per mile be a representitive number? Or an
> > > optimum
> > > number. I mean, would the average power consumption of the vehicles
> > > that
> > > are
> > > built and talked about on this list consume about 300 watts per mile?
> > >
> > > Jim
> >
> > For me, it is about 300 watts average. If I attack a 2 mile 7 percent
> grade
> > hill at 60 mph with my 7000 lb EV, then it could be over 1000 watts per
> > mile. Coming down that hill and and doing about another 2 mile roll
> > out,
> it
> > then becomes 0 watts per mile where the motor is still rotating which
> > runs
> > the rotating inverter-alternator which is still generating power for all
> the
> > accessories.
> >
> > Most of my driving is at 10 to 25 mph on non level streets which I
> > always
> > starting a down hill run first and then roller coast up for the rest of
> the
> > distance and may have only two stops a day. One stop at the destination
> and
> > one stop at home. No stop signs, no red lights and may drive for days
> > without seeing any other cars on the road.
> >
> > In the winter, I will use twice the energy pushing through a foot of
> > snow,
> > running three heating systems, seven fans, three pumps 14 external
> > lights
> > and over 50 instrument lights.
> >
> > Roland
> > >
> > > ----- Original Message -----
> > > From: "Roland Wiench" <
[email protected]>
> > > To: "Electric Vehicle Discussion List" <
[email protected]>
> > > Sent: Friday, October 12, 2007 9:29 AM
> > > Subject: Re: [EVDL] kw and mpg conversion?
> > >
> > >
> > > > Hello Jim,
> > > >
> > > > You can use the Btu's per gallon method. The average gasoline btu's
> is
> > > > about 115,000 btu's per gallon. One kilowatt is 3412 btu's.
> > > > Engines vary in efficiency all the way down to 25% and a electric
> motor
> > > may
> > > > be as low as 80%. So if all the mechanical efficiency of both rigs
> are
> > > > equal then:
> > > >
> > > > 115,000 x 0.25 = 28,750 btus for the engine
> > > >
> > > > 28,750 / 3412 = 8.426 kilowatts.
> > > >
> > > > 8.326 kw x 0.80 = 6.66 kw for a electric motor
> > > >
> > > > 6.66 kw / 746 = 8.9 hp
> > > >
> > > >
> > > > If you take everything at 100% efficiency then:
> > > >
> > > > 115,000 btu's / 3412 = 33.7 kw
> > > >
> > > > 33.7 kw / 746 = 45 hp
> > > >
> > > >
> > > > Lets say that you vehicle is getting 300 watts per mile at 60 mph
> > > > then
> a
> > > > engine at 100% efficiency would have to get:
> > > >
> > > > 33.7 kw / 300 = 112 mpg
> > > >
> > > > Roland
> > > >
> > > >
> > > > ----- Original Message -----
> > > > From: "Jim L" <
[email protected]>
> > > > To: "Electric Vehicle Discussion List" <
[email protected]>
> > > > Sent: Friday, October 12, 2007 9:49 AM
> > > > Subject: [EVDL] kw and mpg conversion?
> > > >
> > > >
> > > > > Is there a formula for figuring out an approx energy use for a
> vehicle
> > > > > based on its mpg performance?
> > > > >
> > > > > For example, if a car got 25 mpg on average, what would be the
> amount
> > > > > of
> > > > > kw needed to maintain highway speeds?
> > > > >
> > > > > If there is no easy formula, is there a range of kw usage that
> > > > > would
> > > cover
> > > > > most typically used vehicles? i.e. 'X' kwatts for a small
> aerodynamic
> > > > > vehicle to 'Y' kwatts for say a standard 1/2 ton pickup truck?
> > > > >
> > > > > I realize that this would probably only be estimates.
> > > > >
> > > > > Any Ideas?
> > > > >
> > > > > Jim
> > > > > _______________________________________________
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> > > >
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> > >
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> > >
> >
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> >
>
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