On Wed, Jun 22, 2011 at 02:24:48PM -0000, r.ramjet@ymail.com wrote:
>
> Last year we experimented with the batteries. A battery recycler
> suggessted that I use 4 12v deep cell batteries to get the 48v I
> needed to drive the 36v 4.5 HP motor. I actually went with 3 8v Golf
> Cart batteries and 2 12v #27 deep cell. BIG MISTAKE.
This is the area where I'm trying to figure out what's reasonable. E.g.,
the proposed system from ElectricYacht was their ibl360 motor and a
400AH@72v bank. For a motor that draws 360A at max output, that seems
woefully inadequate; given the Peukert effect, heat issues, etc., that
sounds like about 20 minutes at WOT.
I realize that looking at max draw is not really reasonable - the thing
that matters the most is where the breakover point in the curve is
(i.e., where you get a good product of speed vs. time, a.k.a. reasonably
efficient usage.) The big question is, what is the best approach for
getting the greatest effect within, say, 1800 lbs. of batteries + motor?
Or is this still an inexact science, and all you can do is take a good
guess?
I'm not rich by any means, but given the price of a new diesel plus the
hassle (or the cost) of installing it, I'd be quite happy to spend at
least that amount for a good electrical drive system. Cheaper would be
even better, of course. :)
Ben
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