The expense of HHO depends upon the cell design, and the driver used. I have a design with off the shelf materials that should present a large surface area to make the most HHO.
I will be driving it with an AC signal, to avoid electrode breakdown problems. I plan to adjust the frequency of that drive signal to peak the HHO production. It will be more efficient than the DC driven plate type cells. But there is no data on these changes all together, so I will need to run some tests for the best operating point.
Theoretically, there will be a frequency that will be best to split the water into HHO. I have not been able to find any research on what that frequency should be for top efficiency, so I will just have to vary that frequency and test it.
I plan on monitoring the current to the cell, and to look for a corresponding voltage null for the peak power point. Once I find that, I will measure the HHO flowrate. If I get enough, I will try to run a car on it.
I will post this as I go along. But I should be able to get plenty of volume to run a generator. It would be kind of fun to run my house with water as a fuel.
I have seen a number of designs for harvesting wave action, and it is a very reliable source of power. But, since I am in the middle of the country, I can't do it here.
I intend to collect Heat from the sun, for DHW (Domestic Hot Water) and I may use a Peltier Module to make electricity from solar heat. But I have to finish the conventional system first.
RE: Now they're even hacking my account to give upvotes FROM ME to people who support my main DOWNVOTER!!