Re: battery help

On 16 Aug 2007 at 10:29, bjstaff@... wrote:

> It is 28 miles round trip.  I should be able to charge at the halfway point as
> well.
>
> What is your suggestion on batteries?

If you can get one-third of the vehicle weight in golf car batteries, you'll
have a practical 40 mile range at moderate spees.  This should be plenty to
handle your commute even if you can't charge during the day.

Voltage is unimportant for range.  If your empty glider weighs, say, 1600
lb, figure 800-900 lb of lead.  That's 12 to 14 golf car batteries.  Then,
in an ideal world, you'd choose your controller and motor to operate on 72 -
84 volts and produce around 40kW to provide adequate acceleration
performance.  With a DC series motor, this would mean a 500 to 600 amp
controller.

Since you already have the controller and motor, your choices are more
limited.  I think 72v is too low for a 1231C.  You might consider using 15 8-
volt golf car batteries.  They're a decent compromise between 6v life and
12v voltage.  Don't draw more than 375 amps from them if you can help it.  
This would be 45kW, which should be more than enough for 1960s VW Bug
performance.

David Roden - Akron, Ohio, USA
EVDL Administrator

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