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RE: Re: (ET) PV powered ET more questions
thanks all. yes this all helps. it's better than school!
to clear up the confusion about the 1v per battery...
I have the four batteries in the back wired together in series total
voltage
right about 30.something... I have only the cable coming off the last
battery going to the shunt connected. I then check voltage between
battery
one and the frame and get a voltage reading 1.2something volts, go to
battery two and get a reading of 2.4 etc until I get to the last battery
and
get a reading of 4.8v I think it was.
that's when I unhooked the cable from the pack that goes to the shunt and
checked it with the ohmeter expecting to get a reading and didn't.
from one of the previous posts I think I should try this with an analog
meter
next time I'm on the farm.
thanks all, I'm going to print off all responses and take with me this
wkend.
dave
seattle
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Open WebMail Project (http://openwebmail.org)
---------- Original Message -----------
From: JAKrug EBAerospaceAndDefense com
To: daveb seanet com, rmurcek geisinger edu
Cc: Elec-trak cosmos phy tufts edu
Sent: Wed, 5 May 2004 09:25:28 -0400
Subject: RE: Re: (ET) PV powered ET more questions
> Really really.
> It got me once.
>
> I am a little confused about the 1 volt per batt statement.
> If you check different points in the battery pack to ground you will
> see were the short is in relation the the pack. Another way to check
> if it is a real short or just dirt is check the current that flows
> from the pack to the frame. Use a limiting resistor in series with
> the meter so that you don't blow the fuse in your meter. You won't
> get much current flow though dirt. If you have the batteries
> disconnected you can use an ohm meter between the battery cable and
> the frame. Readings in the megohm range and higher are usually dirt
> or contamination. hope this helps. Jeff
>
> Sincerely,
> Jeffrey A. Krug
> Test Engineer I
> The Ensign-Bickford Aerospace & Defense Co.
> 640 Hopmeadow Street
> P.O. Box 429
> Simsbury, CT 06070
> Phone: 860-843-2072
> Fax: 860-843-2069
> E-Mail: jakrug EBA-D com
> Pager 860-802-4153 numeric
>
>
>
> -----Original Message-----
> From: daveb [mailto:daveb seanet com]
> Sent: Tuesday, May 04, 2004 7:26 PM
> To: rmurcek
> Cc: daveb; Elec-trak
> Subject: Re: (ET) PV powered ET more questions
>
> really? maybe that explains why the my digital meter seems
> schizophrenic at times. It wasn't damp at all when I was doing the
> metering though, and I got a zero reading before hooking the pack
> up to the harness. after hooking up to the harness I'd get just a
> little over 1v per batt and a total of about 4.8v from all four.
> I don't think that could be dust. could it?
>
> thanks,
>
> dave
>
> --
> Open WebMail Project ( http://openwebmail.org)
>
> ---------- Original Message -----------
> From: "Bob Murcek" <rmurcek geisinger edu>
> To: <daveb seanet com>
> Cc: <Elec-trak cosmos phy tufts edu>
> Sent: Mon, 03 May 2004 23:49:29 -0400
> Subject: Re: (ET) PV powered ET more questions
>
> > If you're using a meter with really high input resistance, like
> a digital meter, it would take nothing more than damp dust in the right
> place to get a voltage reading to the frame....
> >
> > >>> "RJ Kanary" <rjkanary nauticom net> 5/3/2004 9:32:54 PM >>>
> > 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 > > >
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