[ausev] EV Calculator Script

[tomsmail]

Hi Nick,
Just a note: the rolling resistance quoted by tire
manufacturers is not the same thing as rolling resistance of
the vehilce; it doesn't include bearing pre-load torque and
other shaft resistances.  These others contribute to lost
energy.  You have at least 8 bearings on the average EV
conversion.  A Haynes manual which I have states that these
are anywhere from 1 to 10 ft.lbs. (paraphrase).
(I know this is probably nit-picking, but) are you looking
for ultimate accuracy in the model?  You might want to look
into this.

Tom

> Hi all,
>
> I know that there are a handful of sites already online
> with scripts  that attempt to calculate things such as
> range and top speed for EVs.  However, I've been
> under-impressed with all the ones I've seen so far,
> because their user-interfaces tend to be counter-intuitive
> and all the  results I've gotten were very to extremely
> inaccurate/inapplicable to  what my EV can achieve in real
> life.
>
> So I've been playing around with writing my own calculator
> script I call  the Electric Vehicle Range, Acceleration,
> and Top Speed calculator (aka  EV-RATS). My main goals for
> this calculator script is to be easy to use,  yet powerful
> and as accurate as possible for such a script. For example
> ,  *correctly* calculating Peukert's effect for a given
> battery pack and  adjusting range and run time accordingly
> is too important to ignore.
>
> EV-RATS is here:
> http://www.driveev.com/tools/evrats/index.php
>
> I'm interested to hear any thoughts, suggestions, etc.
> about it. I'm  still working on it, so there may be issues
> with it that I haven't  discovered yet. Most importantly
> I'd be cool to hear how close it comes  to predicting the
> real-world results (range, top speed, V sag, power
> consumption, etc..) you all get from your EVs after
> putting your numbers in.
>
> Thanks!
>
> --
> -Nick
> 1988 Jeep Cherokee 4x4 EV
> http://Go.DriveEV.com/
> http://www.ACEAA.org/
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