To get to just a million volts BennyF would need a series string of 50 of those large 20KV capacitors. The string would be a would have only 0.02 fraction of the capacity one of the capacitors in the string, which I would guess is not more than 20 microfarads. (I used quite similar capacitors for 15 years when working on the controlled fusion problem.) If that guess is correct, he would with 50 units have a 0.4 microfarad / million volt capacitor in which he could store the staggering quantity of 0.2 joules! Please Register or Log in to view the hidden image! (Note 0.2J could sustain a 100W light bulb for 2 milli seconds! If the filament were cold and 0.2J were dumped into it, I doubt it would even get hot enough to emit any light. BennyF is going to disconnect entire office buildings from the grid with his invention! We should move this thread to "jokes and funny stories" thread. Great ignorance can be amusing.) Most high voltage capacitors are used in a fast discharge mode to get very high powers. Thus they are also designed to keep the internal inductance as low as possible as it is the LC time constant that determines how fast you can dump the stored energy. This makes these capacitors more expensive. You did not tell the price, but I would guess at least $400 each.* If that is correct, he would pay $20,000 to store 0.2J at in at a million volts. The 1.25 J stored at 5 V in the 1 Farad capacitors of post 53 photo is 6.5 times more energy than 0.2J so if he wanted to store the same 1.25J at a million volts, and my guesses are about correct, it would cost him 6.5x20,000 = $1.25 million dollars - nearly what I calcualted before in post 54 but less as only 50, not a million subunits to buy and wire up. These near identical results tend to confirm my guesses. PS one reason why high voltage capacitors with rating above about 20KV are not common is that is about the limit of Hg vapor ignatron switches - You don't dischage these 20KV capacitors with a knife switch especially in a string with a million volt charge. -------- * I would not be the least surprized if a low inductance, 20 microfarad, 20KV capacitor cost $1000 now. If that is the case, then BennyF string would cost more than 3 million dollars to store the same energy as the $5, low-voltage capacitor of the post 53 photo! And that does not include the oil filled room they operate in to avoid air breakdown discharge.