All,
I'm not trying to be an ass about this, but based on some things that have been said, I'm NOT sure everyone here has a real understanding of potential based systems, so I am going to take you through "Potential Based Systems 101." You may already know all this. If so, I apologize, but I am sure it will benefit SOMEONE.

First, let me throw out MY two bit theory of electricity as it specifically pertains to DC power from a battery. I believe the power comes out of the battery, goes through the load with absolutely MINIMAL losses, and back into the other side of the battery where that power DIES. It isn't the load that "kills" the power, it is the battery itself. If you can keep from sending that power into the ground on the battery to die, you can use it over and over and over. Hence my attraction to potential based systems.

Imagine you have four batteries you have charged up to MAX with your charger. It couldn't possibly raise the voltage in any of those batteries by .01 volts if you left the charger on for days. (TRY THIS...I have)

Is the charge that is in each battery going to be exactly the same as the charge in all the other batteries? I doubt it. They will probably ALL be different. Now if you connect all the positives together and all the negatives together and let the batteries sit overnight, what will happen? You will come out the next morning and all four batteries will have EXACTLY the same charge in them. WHY? Because that energy flows like water and wants to equalize. And here is the interesting part. The batteries that were high went DOWN but the batteries that were lower went UP, EVEN THOUGH YOUR CHARGER HAD CHARGED THEM TO THE MAX. You actually increased the POTENTIAL of these batteries to receive energy by doing this. Some batteries went "down" but did you "lose" this energy, or did it just transfer over to the batteries that were lower and went up? Try it and YOU tell ME.

Take two of these batteries and put them in series to make one big battery that has a positive and a negative. You now have a 24 volt "big" battery. For purposes of something I will talk about later, I want you to remember that this is the "HIGH VOLTAGE SIDE". Now connect your other two batteries in parallel with the "big" battery. What you really have is a battery that is charged to 24 volts and two batteries that are at 12 volts. If you leave them set, connected in parallel, what do you think is going to happen? The "battery" that is at 24 volts is going to decrease and the two batteries at 12 volts are going to increase. Do you lose any energy, or does it just move from the battery with more energy to the battery with less energy and actually INCREASE the potential of that battery with less energy to absorb a charge? You HAVE to do the simple experiments over and over and over to understand what is going on and how to make the best use of it.

Let's try that same experiment again, but this time between the positive of the big battery and the positives of the two batteries in parallel we place a motor. Now as the energy moves from the 24 volt side to the 12 volt side, it runs the motor. Dos the motor use up this energy as it moves through? Well some is lost as heat in the wires, but mostly NO, it is not lost. It travels through the motor and out the other side and equalizes the batteries just like before, only it ran our load along the way...basically for free. TRY IT WITH and WITHOUT the motor and compare the results. This motor was not really a "LOAD" because it USED no (or very little) energy.

And it isn't the "load" that determines how much power moves through it, it is the potential difference.

For instance, if I have two batteries in series...One is charged to 12.2 and the other is charged to 12.7....Their combined voltage when wired in series is 24.9.
When you put a load between the positives of these two batteries in series and a third battery that is charged to 12.9, you have a potential difference of 12 volts. If what you are trying to run needs EXACTLY 12 volts to run, it will immediately start running. And will probably run for a while before stopping. Why will it stop? Because as battery 3 charges to greater than 12.9 and the total voltage of the two in series drops to less than 24.9, you no longer have the potential difference of 12 volts to run the load. It's that simple. Thats why a 12 volt motor is a great load. It will run on less than 12 volts, so can continue running even though the potential difference goes down. But at some point, when the batteries in series have gone down and the batteries in parallel have gone up, the potential difference is so little that the motor stops. You should have switched batteries around long before that. This change in the potential difference was the thing that Benitez fought to deal with for YEARS, because the load will no longer run.

You really need a minimum of three sets of two batteries. Two in series providing the 24 volt side. Two in parallel to be charged. And two that are resting after being charged. It would be even better, if you could afford it, to have one extra set of two. The batteries that have just been discharged could move to a rest position to recover, and two batteries that WERE in this rest position move into the position to be charged. If you follow one group of batteries through the cycle it would be
1. Provide power (in series)
2. Rest
3. Charge (in parallel)
4. Rest

Now the boost circuit assures that the voltage that is hitting the charging batteries is HIGH enough to assure proper charging, and it EXTENDS the time that this happens. Because it accepts a "range of voltages" and puts it out at 16 volts (when you set it to) it continues to hit the charging batteries with 16 volts even when the potential difference has gone down below 12 volts a ways.

When do you want to switch batteries around??? When the charge hitting the charge batteries drops below two volts above the charge battery voltage. Because a DC motor PULSES, the charge that hits the charging batteries is a PULSED CHARGE, and you want it to be 2 volts over the battery voltage at all times. The boost circuit takes care of this. With careful management, you can make sure your charging batteries are always being properly charged.

This is a potential based system. You are not USING the power, you are moving it around to do work without sending it to ground and destroying it.

If the motor you are running with this system is used to turn a generator you have a bit of extra power to top off your batteries from time to time, or take one generator coil and use it to cap dump charge a couple batteries to go into the rotation once in a while. No matter HOW you look at it, this is the basis of an over unity system. How FAR over unity is up to you. How big a generator can you run with that motor? How efficient it it? How much power will it put out?

Oh, and then what if the output of the GENERATOR you are running becomes the HIGH VOLTAGE SIDE (remember I talked about that above) of a BIGGER potential based system. That runs a BIGGER motor that turns a BIGGER generator. Work your way up until you are running the country on your eight 12 volt batteries.

AM I crazy? Oh yeah!