RE: (ET) PV powered ET more questions

["Elie, Larry \(L.D.\)" <lelie ford com>]

Something will go poof.

You must break series connections before making parallel ones, and 
vise-versa.  
Isolation is important to the ET.  One does prefer to charge in parallel 
(perfect 
equalization) and run in series, but that isn't practical without some big 
100 A switches, 
and lots of wire.

The Xantrex is a 12 V in switching inverter.  It is forgiving, but not 
THAT forgiving.  
It wants to see 12 V.  You can tap off 2 batteries, and run to the 
Xantrex, which is isolated 
WITHOUT breaking the series connection that is already there.  The 
'ground' (neutral) for the 
Xantrex will be the most negative point of the most negative battery 
connected to it.

Larry Elie



-----Original Message-----
From: elec-trak-bounces cosmos phy tufts edu
[mailto:elec-trak-bounces cosmos phy tufts edu]On Behalf Of robert
winfield
Sent: Thursday, April 29, 2004 8:39 AM
To: Elec-trak cosmos phy tufts edu
Subject: (ET) PV powered ET more questions


Is this a hallucination and am I asking for an
explosion?
My Elec-trak has 6 DEKA Solar batteries in series for
36volts.

If I take 3 pairs of cables to the screw tops
(batteries are connected by the lead squeeze
connectors) and parallel them off so I have 3 sets of
12 volts, am I asking for an explosion if I run that
into a 12v charge controller or a 12v in 120v out
1.75kw Xantrex inverter?
Can I have batteries wired both in series and
parallel?
I realize dead shorts anywhere are very bad. 

I suspect I have too many paths for the electrons but
when I look at the drawing, if the charge controller
or the inverter can take it is looks ok.
I just have a queasy feeling I am missing something.

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)

(alt energy store sells 36v charge controllers i found
out, 5, 10, 20 etc amp)

--- daveb <daveb seanet com> wrote:
> last year I was able to buy a 36v CC from BZ
> products for under $70.  don't 
> know if they are still around and available though. 
> let me know if you are 
> interested and I'll make the effort to look up my
> old receipt and info.
> 
> dave
> seattle
> 
> --
> Open WebMail Project (http://openwebmail.org)
> 
> 
> ---------- Original Message -----------
> From: robert winfield <winfield100 yahoo com>
> To: elec-trak cosmos phy tufts edu
> Sent: Wed, 28 Apr 2004 13:01:52 -0700 (PDT)
> Subject: (ET) PV powered ET
> 
> > I have an E-12.
> > I am trying to figure how to use photovoltaics to
> > charge the batteries. I had this discussion before
> but
> > the info has vanished (sorry Chris)
> > Can I use a 12 and/or 24v charge controller and
> clip
> > it on either 2 or 4 of the batteries.
> > The PV I am looking at puts out probably 120 watts
> > depending on how configured I can series them to
> get
> > 12v or 24v or 36v and 1/2 or 1/3 the amps
> > 12v@10amp or 36v@3.3amp.
> > I would also like to yank the battery charger out
> for
> > more room or shoehorn bigger batteries.
> > basically advice:
> > 2 charge controllers, 1@12v and 1@24v jumpered
> across
> > 2 or 4 batteries
> > 
> > could i use 1 24v and have the electrons wander
> > towards the 2 batteries not in that circuit)
> > 
> > 1 charge controller @36v (and where to find one??)
> > comments?
> > 
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> ------- End of Original Message -------
> 



        
                
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