Ok time to step in here,
Now IF his (meyers) concept is correct then his means is logical for the components used.
Stans "modified" alternator has 1 confirmed change (the single diode) and one possible other change to remain constant. The Diode is there to block the negative voltage from coming out. In his patent he only wanted the voltage on the positive side not the negative. Hence the didoe. Now the second modifacation would be to the "arms" on the rotor, as these determin the frequency at a certain rpm these could be modified if the alternator was used simply to produce the frequency he wanted. Hit the core of the rotor with your desired power (in his patent he points out number of only a few volts). The black box as described would be an old make shift PWM (gating in his patent). This would explain why he needed the electric motor to turn the alternator, adjust the speed to adjust the frequency, keeping the input ampere low would lower the amount of force required to turn the alternator.
Now heat is not always created by amps. Heat is created by resistance. Transformers and inductors also generate a lot of heat. If the leads were made out of SS or some other conductor with a high resistance this would cause heating.
I am not advocating Stans work as true. Simply pointing out some physics and logic between observations and descriptions in his documentation.
Ultimately if true, frequency modulation now could be replaced with simple circuits and with PWM not hard to come by in these circles, energy required would be lessened even more. The hard part is knowing the frequency range. As he talks about the frequency having to do with the liquid composition itself and the size of the gap over the length and shape of the electrodes. If you are attempting to copy Stan, good luck and keep us posted.