My guess

Tesla (et al) L1 circuit as Bolt already described, 1/4 wave electric monopole/parallel LC (high impedance circuit) at self resonant frequency.  To capture HF magnetic disturbance from L1, use low impedance circuit receiver, like half wave magnetic loop antenna.  Series LC circuit at self resonant frequency is low impedance BUT also very high voltage between L2 & C2.  Volts & amps in circuit 2 are 90deg out of phase.

Big sparks TC is functionally the same, toroid is one half of capacitor, air is dielectric and whatever sparks hit first is other side of capacitor, to ground and circuit is completed, if you earth bottom of L2.

None of my words/phrases used, all AC circuit theory, transmission lines, standing waves, antenna theory.  All out there on web or in texts, just pick out right bits of jigsaw.  If I'm wrong, please correct.

Yes, I also see these changing day/night effects with my battery research.
The voltage depends often which time  day/night  it is.

Well I don't know what it is but that pistol shrimp cavitator eats well, no?
Spark gap into a magamp?

The goal is to cause a virtual spark gap inside the ferrous. Oh yeah.
Nuclear magnetic resonance.

http://www.overunity.com/index.php?topic=8227.msg249054#msg249054

And stop trolling! If you don't believe in this stuff which has been built, tested, documented, researched by others then go and take up knitting or gardening instead.

Clearly we are getting to close to the mark the paid saboteurs are on board! This is a good sign:)

Don't rely on others to prove all of your false talk, insolent troll!

Show me one thing you have built that works.  All it takes is knowledge of the coils and how they interact, not a lab full of equipment.

You are as far from the mark as possible and your inflated ego is attempting to lead others astray.  Stupidity loves company!

And stop trolling! If you don't believe in this stuff which has been built, tested, documented, researched by others then go and take up knitting or gardening instead.
...

Science is not a question of belief, but of knowledge about facts and observations.
The "stuff" about "electrons decaying into vitrons and solitrons" or about "UFO's glow" or "anti-gravity" or "your body embedded in the floor or ceiling" is pure irrational beliefs, they are neither tested nor documented nor duplicable: fables and pseudo-scientific blah are not to be confused with facts and logic, otherwise with the same solid "arguments" the belief in the holy pink unicorn could also be a matter of fact, "tested and documented".
Please don't demand to others to stop trolling. Stop yourself.

Science is not a question of belief, but of knowledge about facts and observations.
The "stuff" about "electrons decaying into vitrons and solitrons" or about "UFO's glow" or "anti-gravity" or "your body embedded in the floor or ceiling" is pure irrational beliefs, they are neither tested nor documented nor duplicable: fables and pseudo-scientific blah are not to be confused with facts and logic, otherwise with the same solid "arguments" the belief in the holy pink unicorn could also be a matter of fact, "tested and documented".
Please don't demand to others to stop trolling. Stop yourself.

anti-gravity effects read about sweet floyd VTA that wasn't long ago witness by many including John Bedinni. Just one example of hundreds. Also the TPU has gravitational effects.

UFO's glow documented by hundreds and part of the UFO disclosure plan. Also green haze seen in VTA witnessed by several people at Floyds house. The VTA also shorted out and froze solid. Floyd noticed the device got much lighter in fact on one test he thought it was going thru the roof so he hit the power switch.

your body embedded in the floor or ceiling - fairly well documented witnessed by many who wrote about the  Philadelphia Experiment as an excerpt - One test, on July 22, 1943, resulted in the Eldridge being rendered almost completely invisible, with some witnesses reporting a "greenish fog" appearing in its place. However, crew members supposedly complained of severe nausea afterwards. Also, it is said that when the ship reappeared, some sailors were embedded in the metal structures of the ship, including one sailor who ended up on a deck level below that where he began, and had his hand embedded in the steel hull of the ship.

Now like 9/11 you have the government version and the true witnessed by dozens version and several books about it from many sources all describing the same details.  The official version is non of this ever happened:)

Vitrons and Solitrons straignt out of wiki "a soliton is a self-reinforcing solitary wave (a wave packet or pulse) that maintains its shape while it travels at constant speed. Solitons are caused by a cancellation of nonlinear and dispersive effects in the medium. (The term "dispersive effects" refers to a property of certain systems where the speed of the waves varies according to frequency.)

The bound state of two solitons is known as a bion.

In magnets, there also exist different types of solitons and other nonlinear waves.[10]  These magnetic solitons are an exact solution of classical nonlinear differential equations — magnetic equations, e.g. the Landau-Lifshitz equation, continuum Heisenberg model, Ishimori equation, nonlinear Schrodinger equation and so on.

I could go and and on about the effects of radiant energy but whats the point when 95% still don't even know it exists or live in complete denial.

But the earth is still flat and metal planes cant fly they are too heavy.

Ooh i forgot things are only true if they are aired on CNN and Newsnight otherwise its all nonsense. You better talk to John Bedini about a few of these things. He know he was there and can tell you all about the VTA.

Almost forget when you speak to John Bedini ask him about night time radiant energy losses and why it happens. He has seen it for himself many many times.

Perhaps we could go back to the topic here?

I mentioned the marked difference in day/night performance on the Bedini because

IF this also occurs on the Kapagen replications we can surmise that we are tapping the same energy that is also occurring in many of the other devices

we can see THAT indeed there is an extraneous energy field otherwise the battery voltage would not fluctuate

we can see that the Kapagen device might be slightly or heavily OU or under unity depending on the time of day the measurement was taken.

Therefore I strongly suggest that those of you who have a working device try to measure the output during different times of the day. And do not despair if its under unity it might be different at another hour.
My HOPE is that it would be just complementary to a solar system- would it not be nice if the Kapagen could kick in when the solar panels go out?
All the UFO and other stuff should not touch this topic here IMHO. Its like religion:You are free to believe it or not. I myself try to rely on my meters and my eyesight.