Re: (ET) ryobi

["Christopher Zach" <czach computer org>]

Well, the Prizm's running voltage is 300 volts at 52 amp-hours. Thus the
batteries are run in two strings of 25, connected at the ends by 
contactors.

Pretty high voltage. However the car can *move* since the batteries can
deliver 4C without sagging too much (200amp max draw at 300 volts is a lot
of power).

The Hawker Genesis batteries are probably the best in the business. They
will crank a V-8 motor without trouble, and I have used one on my garden
tractor for a year with no trouble. I think the max current you can draw on
them is something like a thousand amps. And they weigh only 24 pounds each.
Small, compact, high power.

I am thinking of wiring up three of the old ones together and seeing how 
far
they take the Elec-trak (loaded with 6 volt batteries of course :-) Based 
on
my calculations, six of them (two strings of 3) should provide enough power
to run the tractor for 30 minutes or so.

Chris



----- Original Message ----- 
From: "Dave & Debbie Barden" <daveb seanet com>
To: <czach computer org>; <wombat dssinternet net>;
<elec-trak cosmos phy tufts edu>
Sent: Monday, May 19, 2003 2:26 AM
Subject: Re: (ET) ryobi


> 54?!  how did you wire them, what's the pack voltage?
>
> this wkend I just got a sears cordless mower running that I rescued from
the
> dump.  The 24v charger came in the mail friday, the 12v sealed batts
measured
> 2.2volts each!  but after 2 days on the charger came up to 12.7v.  I ran
it but
> only for a coupla seconds.  my charger did the same thing only the green
> "ready" led ever lit up.  the red "charging" led never has come on.
>
> there's not much grass here in my neighborhood here in town to test it on
so
> I'll have to wait till next wkend when I bring it the farm.  I plan to 
> use
it
> for the lawn in close to the house and flower beds and the E-trac on the
other
> 1/2 ac of lawn.
>
> dave
>
> > Could also be that after sitting for years the battery is fully
sulfated.
> >
> > If it's a 12 volt 26amp/hour battery then they cost $50 new from
> > www.surplusev.com. I just bought 54 of them for my electric car; really
nice
> > batteries. Have been thinking of trying to run the E20 with a set of 
> > six
of
> > them :-)
> >
> > Chris
> >
> > ----- Original Message ----- 
> > From: "Neil Dennis" <wombat dssinternet net>
> > To: "Elec-trak" <elec-trak cosmos phy tufts edu>
> > Sent: Monday, May 19, 2003 8:42 AM
> > Subject: (ET) ryobi
> >
> >
> > > I've got probably the same model, the battery indicated "charged'
after
> > > running the charger for several hours but wouldn't start the mower.
If
> > > I remember, I found an open connection somewhere, after fixing, the
> > > mower would run with the charger plugged in but about a minute on the
> > > batt.
> > >
> > > It sits in my garage, too cheap to try and find a new batt, wonder
what
> > > they cost.
> > >
> > > wombat
> > >
> > >
> > >
> >
> >
> >
>
>
>
>
>