[ausev] Fwd: Good sources to get started?

[Josh Handel]

I think I understand BUT I as much as I think I get it, I think I don't
:-P... So let me perpose an "example" of what I am hearning, and someone can
correct (sumorized example below word example) :-P

Lets say I start with 12, 12v Batterys all rated for 40ah (at 20 hours to
make the math easy) running in serial.

If I understand you correctly, what I have is 144v rated at 40 amp hours. OR
5.76kWh's of battery. (stop me here if I am totally wrong here)..

Now continuing on, I make a "perfect" car and it gets 28.8 wh/m at 60mph..
so if everything above is "correct" and I understand what you are saying
then I have would have a 200 mile range (5760 watt hours / 28.8 watts
hours).

12 - 12volt/40Ah batteries in serial = 144volts at 40Ahs = 5760 Wh

5760 wh (from above) / 28.8 wh (consumption per mile) = 200 miles

(yes these are totally bogus numbers, but I wanted to get
the forumla/concept right first :-)..)

So did I "get it" or am I completely wrong?

Thanks
Josh "Not an EE" Handel


On 11/27/07, Sarah & Erik <electricbasset at gmail.com> wrote:
>
> A well built EV will take less than 250 WH/mile, a more common number
> is probably higher than that, say 300-350. This is probably
> appropriate numbers for around town use. Depending on aerodynamics
> your highway energy consumption could be much higher, maybe twice that
> at 60 mph.
>
> To take a stab at whether lead acid batteries will work, look at the
> total capacity which will be given at the 20 Hour rate, and multiply
> by .57 to get how much energy you can count on at the 1 Hour rate.
> Generally with Lead acid, aim for 50-60 % discharge on your normal
> run. Sorry for the short email, feel free to ask questions if this
> doesn't make sense.
>
> Please feel free to pipe up if you think my numbers are bogus.
>
> Erik
>
> On Nov 27, 2007 9:28 AM, Josh Handel <jhandel at ktomics.net> wrote:
> >
> > (Sorry for the duplicate if this shows up twice, I sent the first one
> from
> > the wrong address, and I figure MailMan will probably bounce it so I am
> > sending it again, this time from the right address)
> >
> >
> > Howdy all,
> >
> >    I'm just starting the "investigation" stage of making an ev roadster.
> The
> > goal would be to have something I could commute with (currently its a 50
> > mile round trip from lake travis into town (so Hill country + highway)..
> The
> > idea I am playing with is building roadster based on a locost
> design.  If
> > you want to know what a locost sports car is just google locost :-P but
> the
> > short description is its a lotus 7 clone that is home grown.
> >
> >  Anyways before I can go to far I need to find out more about using an
> EV
> > power plant (transmission concerns, power needs, battery capacity,
> etc..)
> > and while I can read lots of different websites (and have been for the
> last
> > few weeks). I figured I would be better off dropping a line and seeing
> what
> > "starter" sources you guys suggest.. (yes I have read austinEV's getting
> > started and EV America's getting started and a few others as well.. What
> Im
> > am looking for is more detail about calculating performance, range, and
> > power, motor requirements, etc...
> >
> > Thanks
> > Josh
> > _______________________________________________
> > AusEV mailing list
> > AusEV at austinev.org
> > http://www.austinev.org/mailman/listinfo/ausev
> >
> >
> _______________________________________________
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>
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