RE: MOT 4 stack blowing 20A fuses at 50V

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Dave Halliday" <dh@xxxxxxxxxxxxxx>

What was the original ballast?  Inductive? Resistance?

You say that it limited to 4.5 Amps.  At 120 volts, that is only 540
watts. A single MOT should be good for 750 to 1,000 Watts for a few
minutes.

For a 4X stack, you can feed it a solid 20-30 amps at 120 VAC and get
good performance.

Check the archives for "ballast" -- there are lots of good designs that
will yield a lot better performance.



> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Monday, April 10, 2006 8:28 PM
> To: tesla@xxxxxxxxxx
> Subject: MOT 4 stack blowing 20A fuses at 50V
>
>
> Original poster: "Langer Giv'r" <transworldsnowboarding19@xxxxxxxxxxx>
>
> Hello, i have a MOT 4 stack that i use to power my 4" coil.  I
> origonally used a ballast to limit the input current (25 Ohm
> impedance / 4.5A current draw), but when i took the ballast off, the
> transformers drew over 20 A at as low as 50V.  I would bring the
> voltage up using my variac and the 20A fuse would blow at as low as
> 50-70V.  I did this 8 times blowing 8 fuses in a row.  I took the
> ballast off because i was only getting about 6-8" arcs from the
> topload.  So I have no idea how my transformers are drawing that much
> current, can anyone help??  That would be great, thank you!
>
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