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Re: [EVDL] Magnetic Shock Absorber & EV

On 6 Oct 2007 at 16:09, Morgan LaMoore wrote:

> There's part of how you get your range - you're murdering your
> batteries! 80V/16=5V end-of-discharge. You're discharging 6V batteries
> down to 5V! That's like discharging 12V batteries to 10V!

If that's 5v per module >under load<, it's not so bad. The usual advice is
to avoid going below 5.5v per 6v module, but once you're that far down it's
only a matter of a few more amp hours before you get to 5v. So I don't
think that's the story.

Unless he's talking about 5v OC after a rest, which is a whole 'nother
story.

However ...

Even at a steady speed on flat ground, 150 miles is darn good at 40mph in a
moderately aerodynamic vehicle such as an older Civic or Rabbit, using a
manual transmission. EAA and Tour de Sol range rallies have been won with
that kind of accomplishment in those kinds of cars.

If it were 25mph or so, then I might believe 150 miles, given careful
optimization of the suspension, rock-hard tires, and a friendly hard road
surface. But at 55mph in a minivan (brick on wheels), aerodynamics is not
on your side.

While it would help a bit to keep the motor at its most efficient RPM, I'm
pretty sure that the efficiency band of a series DC motor isn't so narrow
that a 5-speed trans can't get close enough. (Motor experts, help me out
here.) A CVT would have to have the same efficiency that a manual trans has
to gain a significant advantage. Designing such a CVT would be quite an
accomplishment, since AFAIK even Honda's CVT doesn't match its manual. And
again I'm not so sure that it would make enough difference.

Color me skeptical. I'd like to see some corroboration of this test run.

David Roden - Akron, Ohio, USA
EVDL Administrator

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