HHO dry cell with PWM problem

[popolibero]

Hi all,


I have a 25 plate HHO dry cell generator hooked in double series for 24V operation. ( -NNNNNNNNNNN+NNNNNNNNNNN- )Since I need to be able to make the output variable I built a PWM controller.


Here's the problem. What I've noticed is that as soon as I lower the power with the PWM, the voltages across the neutral plates go way lower in voltage than the plates closer to the outer plates, the middle neutral being the lowest in voltage. The result is that the outer neg. plates and the pos. plate in the middle got black as they were almost the only ones working. The electrolyzer got really hot! Like 80 degrees celsius.


Since the electrolyzer acts a bit like a cap, lowering PWM duty cycle is like lowering the voltage across it, which when lower than 2V per cell results in a very uneven voltage distribution across the neutral cells. This surprised me a lot as I thought since the same current goes through all the cells, the voltages would be distributed accordingly, which happes but only above a threshold voltage of about 2V per cell.


I know there are many people using HHO cells with PWM but I have never read about this problem, am I the only one to notice this? Is there a way around it? (wouldn't know what though..)


Since my time is very limited I ask only HHO experienced people to respond, people who know what I'm talking about and most of all what they are talking about!


thank you for your time,


Mario

[popolibero]

Hmmmm... looks like nobody is playing with HHO generators anymore here?!


Mario

[kolbacict]

Maybe the concentration of dissolved alkali (PH) was redistributed in the volume of the electrolyzer?
In the middle, the concentration is higher, the electrical resistance is lower. IMHO.

[popolibero]

Hi, no, the water/KOH solution was well mixed before pouring it into the generator.


regards,
Mario

[kolbacict]

Hi. Concentration could divided in process work electrolyzer. 
For some reason . reasons I don't understand.