Guy's I've been researching Step Up and Down DC to DC converters, messing with the PWM and the cell and let me tell you this! There is something there I can assure you this for a fact!
I would like to also add, Before stan ever started his water fuel cell research he was put a giant magafine glass at the top of a silo and tried to heat water in a pipe! He was trying to provide a small town with hot water then something happened and he stoped and started on hydrogen. Let me point out stan was searching for Green energy and I think he ran across the DC to DC being he was already interested in solar power and green energy.
I am telling you all, I think the heart of this technology is in the DC to DC and frequencies. I've seen it work both ways, stepped up and down. I've produced hydrogen with a coil wrapped only a few times at radio frequencies and also lots of times.
The PWM, it should be better understood why he was using a PWM, if you look at these DC to DC devices, you will See why the PWM matters.