# RE: Geek Group Cap mod

```Original poster: "Bert Pool by way of Terry Fritz <twftesla-at-qwest-dot-net>" <txsharpie-at-prodigy-dot-net>

Regardless of how many bottles there are, if they are in parallel, as in the
photo at the posted web site, then the rated voltage is the voltage of one
bottle.  Tesla himself had great difficulty operating thick champagne bottles
at 20kv (CSN, 08-11-99) - no mere beer bottle is going to withstand 80kv.
6,600 volts would be a good estimate of a voltage one bottle might withstand.
If you expect to get 80kv, you'll have to wire 12 or 13 bottles in series, not
parallel.  And by putting 12 or 13 of them in series to get the higher voltage
rating, your capacitance will be 1/12th or 1/13th that of one bottle.  You are
going to need 144+ bottles to get 0.014 at 80 kv.
Bert

At 12:39 PM 5/4/2002 -0600, you wrote:
>
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <jim-at-jlproduction-dot-com>
>
> Hi Bert
> I'm confused. If 12 bottles are rated 80KV/.0125MFD then how can 14
> bottles be only 6,600?
> Jim
>
>
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Friday, May 03, 2002 10:40 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: Geek Group Cap mod
>
> Original poster: "Bert Pool by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <txsharpie-at-prodigy-dot-net>
>
>
> >[snip]
>
> >  The GG page says it is
> >rated at. 0125 MFD -at- 80KV. I divided these numbers by the 12 bottles
> >.00104 MFD for EACH bottle and 6,666 volts EACH. I then multiplied
> these
> >numbers by my 14 bottles and got-
> >.01456 MFD and 93,324 volts.
> [snip]
>
> Jim Layton
> >http://www.jlproduction-dot-com/Tesla.html
>
> Jim, this will be painful news, but your capacitors are in parallel,
> which
> means that the voltage rating on your cap as it is constructed is 6,666
> volts - NOT 93, 324 volts.
>
> Bert

```