Re: (ET) PV powered ET more questions

["daveb" <daveb seanet com>]

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

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---------- 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
> >
> >
> > _______________________________________________
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> > Elec-trak cosmos phy tufts edu
> > https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak
> >
> >
> 
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------- End of Original Message -------