[sdiy] inverter

[bill bigrig]

Howdy,

 Now that's mighty odd. In all my years of wrench
turnin and wirin, i've seen many a low baterry cell
come back up to full charge and survive quite well.
The dumptruck or Caterpillar battery is so you can
play for more than a few minutes amplified. If you're
just using headphones then that'a a different story.
In fact, I did a movie project in 2000 where we used a
battery/inverter to power the mixer and phantom mics.
It worked great until the AD asked if he could plug
the camera heat blanket into my power strip. when I
told him "no" he exploded(he WAS an AD afterall). It
worked real good with a mackie 8 channel board. No
noise problems at all. Except for AD noise. I think
the secret is to get an inverter of good quality, and
buy abut 40 to 50% more capacity than you need. It
seems that they want to get noisier the closer they
are to full output.
Rig
--- "Roy J. Tellason" <rtellason at verizon.net> wrote:

> On Wednesday 12 July 2006 01:09 pm, bill bigrig
> wrote:
> > howdy,
> >
> >  Come to think of it, get yourself a BIG dumptruck
> or Caterpillar battery.
> > If the cell connectors are not exposed, you can
> drill one hole EXACTLY
> > halfway between the posts on the opposite side of
> them. About 1/8" to 1/4"
> > down, you will hit lead or some other metal. Put
> in a screw and there is
> > your 6 volt tap. Now, on the post side you will
> find 2 cell connectors about
> > 1/3 of the length from each post. these are your 2
> and 10 volt taps. Go back
> > to the side with the screw in the center of the
> length of the battery and
> > measure out 1/3 of the length and this is where
> you'll find your 4 and 8
> > volt taps. If you draw 6 equal cells on the top of
> the battery this will be
> > easier to see. If you don't find the cell
> connectors, just seal the hole
> > back up with silicone. 9 volt stuff will do fine
> with either 8 or 10 volts.
> > Casio and Yamaha at 7.5 should do fine on the 8
> volt post. A car stereo
> > amplifer will give you your volume. As I said
> before, for bipolar, use 2
> > batteries. Anything that runs 15 volt bipolar
> should do OK with 12V. After
> > your done, unhook the batteries, wire them in
> parallel and AFTER you start
> > your vehicle, hook them up to the vehicle battery.
> They will charge merrily
> > all the way home.
> 
> Not recommended,  for a couple of reasons...
> 
> First,  you don't want to discharge portions of a
> battery to different levels, 
> they'll never charge up equally afterwards.
> 
> Second,  newer batteries (most of them anyhow) won't
> have cell-to-cell 
> connectors that you can get to,  they go _through_
> the cell walls because the 
> shortest connections give the lowest resistance, 
> and are therefore below the 
> level of the electrolyte.  You drill a hole that has
> the effect of allowing 
> connection between two cells and you've just
> effectively removed one whole 
> set of plates from the battery,  losing a cell in
> the process,  and trashed 
> it.
> 
> Not to mention this voiding any warranty you might
> have.
> 
> -- 
> Member of the toughest, meanest, deadliest, most
> unrelenting -- and
> ablest -- form of life in this section of space,  a
> critter that can
> be killed but can't be tamed.  --Robert A. Heinlein,
> "The Puppet Masters"
> -
> Information is more dangerous than cannon to a
> society ruled by lies. --James 
> M Dakin
> 
> 


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