Re: Very Confused On Grounding

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Sean Taylor" <sstaylor@xxxxxxxx>

Be careful with the inverter type.  If it's not a true sine wave output, I
wouldn't use it on an NST, or any other transformer.  There are a lot of
harmonics there, even for the "modified" sine wave ones.  The harmonics
will cause a lot of core heating as well as a "spiky" HV out.

As far as the battery floating at the 120v output, it shouldn't in a
typical inverter, that's more likely in a UPS where the battery is
contained.  In any inverter designed for a car, the ground and neutral
should be connected to the negative of the battery.  Newer inverters (the
small, lightweight ones) that have a modified sine wave output use a high
frequency and a ferrite core for the stepup transformer and then rectify
the HF AC and use additional semiconductors to create the 60 Hz.

Sean Taylor
Urbana, IL

On Sun, 15 May 2005 17:11:10 -0600, Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi,
>
> The battery will be fine other than maybe having to be recharged ;-))
> Insulate it and don't touch it while hooked to the inverter since it may
> be "hot" relative to the AC output of the inverter.
>
> As to the inverter being damaged, your on your own there ;-))  but it
> "should" be ok...  Let us know if it blows up!!!
>
> It is totally unknown territory there...  Be real cool if it works fine
> which it should...  If the inverter does fail, send it to me and maybe I
> can find out why and fix it too...  Maybe "someone" else has tried
> them.....  Many uses for inverter run TC these days!!
>
> I was going to try the inverting thing myself once, but the extra
> inverted I had is running the list server's computers now ;-)))
>
> Like on Gerry's boat ;-)))
>
> Cheers,
>
>          Terry
>
>
> At 03:34 PM 5/15/2005, you wrote:
> > Hmm, great idea. I have a 1500W continous 3000W peak inverter.  I also
> > have a Diehard car battery.  I could just use those then and everything
> > should be safe, right?  Is there any risk of ruining the
> > inverter/battery or worse yet having the battery explode?  Thanks
> >
> > > From: "Tesla list" <tesla@xxxxxxxxxx>
> > > To: tesla@xxxxxxxxxx
> > > Subject: Re: Very Confused On Grounding
> > > Date: Sun, 15 May 2005 15:06:58 -0600
> > >
> > > Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
> > >
> > > Hi,
> > >
> > > I don't think anyone has done it yet???  But maybe try running off a
> > > computer UPS  backup power supply.  They go real cheap when the
> > > battery is old and dead.  You can hook a car battery to them, but be
> > > very careful since the battery may "go live" to 120VAC potentials...
> > > This would also make a coil portable...  No worries about blowing AC
> > > line stuff then ;-))
> > > They also make 12VDC to 120VDC inverters for RVs and campers...
> > >
> > > Cheers,
> > >
> > >         Terry
> > >
> > >
> > > At 01:37 PM 5/15/2005, you wrote:
> > > > Another thought that I had...if I use the RF ground for my NST case
> > > > won't there be tons of RF on the NST and NST internals?  Wouldn't
> > > > doing this defete the purpose of the Terry Filter and possibly kill
> > > > my NST?  What if I just use the RF ground for the safety gap, filter,
> > > > strike rail, and bottom of secondary?  Not using mains ground at
> > > > all.  I just can't afford anything to get damaged.  It took me nearly
> > > > 6 months to get me 12/30 Franceformer NST.  Everything in the house
> > > > is my parents and CANNOT get damaged.  Thanks
> > > >
> > > > > From: "Tesla list" <tesla@xxxxxxxxxx>
> > > > > To: tesla@xxxxxxxxxx
> > > > > Subject: Re: Very Confused On Grounding
> > > > > Date: Sun, 15 May 2005 11:19:51 -0600
> > > > >
> > > > > Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
> > > > >
> > > > > Hi,...............