[rescue] RE: Submarine batteries

[Tim H.]

Another possible source for inverters is showbiz.  I have a cousin who does audio in Calif. for all kinds of shows, and they use some pretty big stuff in some pretty remote locations.  Most of the time with generators, but not always.  Either way, they definitely use large scale power conditioning in either case.  He did audio once for some "green" event, where the goal was to run from Solar/battery bank, but the batteries couldn't supply the current and the power was clipping pretty bad, which isn't good for electronics, so he stuck a generator behind a bus and ran an extension cord and nobody was the wiser.

Tim

On Mon, 13 May 2002 08:21:46 -0700 (PDT)
James Lockwood <james at foonly.com> wrote:

> On Sun, 12 May 2002, Loomis, Rip wrote:
> 
> >  - 6 submarine-cell batteries will also (conveniently) produce
> >    ~12V, which there are plenty of inverters to turn into
> >    110VAC (okay, really more like 115-120VAC RMS, but who's
> >    counting...)
> 
> Per NEC the voltage spec is 120V, half of the split-phase 240V.  Tolerance
> is supposed to be 110V-125V.  "110V", "220V", and even "440V" are
> mislabelings unless they apply to allowable voltage ranges.
> 
> Bucking 12VDC up is relatively inefficient.  Inverters designed for
> serious use are usually designed around 24VDC at a minimum, and more
> frequently 36-48VDC.
> 
> If the original poster isn't familiar with alt.energy.homepower, READ IT.
> They've gone over off-grid living extensively and have built up a large
> repository of experience.  Reliable continuous-duty inverters are harder
> to find than you might think, Trace is the big name in the biz (the SW4024
> is great if you need to run a well pump or the like).
> 
> Forklift batteries are a favorite over at a.e.homepower, esp the
> 12V/510A-H ones.
> 
> > So it looks as though 6 submarine cells might actually
> > suffice for a backup to windmills...as long as local floor
> > loading permits (7500-9000 lbs. for 6 cells depending on
> > certain details...)
> 
> Standard residential floor loading is around 50psf (75psf for new
> construction).  Sounds to me like pouring a slab is necessary here.
> 
> -James
> _______________________________________________
> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue