Re: (ET) PV powered ET more questions

["RJ Kanary" <rjkanary nauticom net>]

      Both the meters can go to ground, especially if they have ever gotten
wet. It would not pass much current, until another item goes to ground, 
with
the resultant arcing.
  Other prime suspects are the armature contactors,  {The bushings around
the large terminals.} , the traction motor armature terminals, and that
perennial favorite, the Delco® lift motor.

----- Original Message ----- 
From: "daveb" <daveb seanet com>
To: "Chris Zach" <czach computer org>; "Markus Lorch" <mlorch vt edu>
Cc: <Elec-trak cosmos phy tufts edu>
Sent: Monday, May 03, 2004 9:33 PM
Subject: Re: (ET) PV powered ET more questions


> over the wkend I finally got the chance to start the conversion of my 
> E12S
to
> the alltrax controller.  I'm not nearly finished yet as I am taking this
> opportunity to thoroughly check out the wiring for shorts, clean things 
> up
> etc.
>
> so far I've removed and re-installed the rear batteries after painting 
> the
> box and installing the plastic battery bags from Bill G.  Before I 
> started
I
> was getting 5v between the pack and the frame.  with the batteries 
> cleaned
up
> in the new bags and connected together but not to the wiring harness I
read
> 0volts.  when connecting the cable that runs to the shunt I read 4.8v
again.
> Ok I reason even though I inspected the wires in and out of the box
something
> is grounded but where.  So I get the bright of idea of using the ohm 
> meter
> but find nothing!  No continuity anywhere between the cable and the frame
and
> yet I read 4.8v.  How can that be?  is it because my ohm meter's battery
is
> only 9v, old and probably needs replacing?
>
> The next time I'm at the farm I'll disconnect the cable from the shunt 
> and
> measure voltage to the frame and proceed downstream
> disconnecting/checking/reconnecting as I go.
>
> oh and I measure 15.8ohms across the motor's field.  is that within 
> range?
I
> seem to remember someone not long ago mentioned field resistance but I
don't
> remember what the correct amt was.
>
> any other ideas or comments would be greatly appreciated.
> thanks,
> dave
> seattle
>
> --
> Open WebMail Project (http://openwebmail.org)
>
>
> ---------- Original Message -----------
> From: Chris Zach <czach computer org>
> To: Markus Lorch <mlorch vt edu>
> Cc: Elec-trak cosmos phy tufts edu
> Sent: Thu, 29 Apr 2004 22:25:25 -0400
> Subject: Re: (ET) PV powered ET more questions
>
> > Um no.
> >
> > If the higher capacity batteries are in series with the low capacity
> > ones and you run the charger, what will happen? Either you will boil
> > and overcharge the lower ones to charge up the higher ones, or you will
> > never fully charge the higher capacity batteries.
> >
> > The "right" solution is a 36 volt inverter. If you're only going to use
> > a little bit of power, then a 24 volt (better) or a 12 volt could *do*.
> > However two of your batteries will be out of sync on charging, and
> > you'll still wind up overcharging some batteries on the pack to get
> > everything back in sync.
> >
> > Get a Trace DR3624. You'll have 3,600 watts of power, and it will
> > pull the pack down evenly. With that you should be able to run 
> > anything.
> > Chainsaw, etc.
> >
> > Chris
> >
> > Markus Lorch wrote:
> >
> > >>This is so I can use Solar PV to charge my batteries,
> > >>carry a small inverter on the ET to run a small
> > >>commercial inverter for string trimmers and electric
> > >>chain saws (Price Club/CostoCo had a nice deal on
> > >>1.75kw Xantrex inverters)
> > >>(and run the fridge, a radio and a couple of lights in
> > >>a pinch.) (There are a LOT of trees hanging over a LOT
> > >>of electric lines anywhere I drive, many more than
> > >>10-15 degrees past vertical)
> > >
> > >
> > > The previous owner of my E20 has put two larger (higher capacity)
> > > batteries in my elec-trak. These drive the 12V components. I also
> > > have a 300W inverter hooked up (cheap $20) to which I connect my
> > > small electric trimmer. It worked fine all afternoon yesterday.
> > >
> > > Maybe you can also have two batteries be larger?
> > >
> > > see my other post on chargers.
> > >
> > > Markus
> > >
> > >
> > > _______________________________________________
> > > Elec-trak mailing list
> > > Elec-trak cosmos phy tufts edu
> > > https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> > >
> > >
> >
> > _______________________________________________
> > Elec-trak mailing list
> > Elec-trak cosmos phy tufts edu
> > https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> ------- End of Original Message -------
>
>
> _______________________________________________
> Elec-trak mailing list
> Elec-trak cosmos phy tufts edu
> https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
>