$187.00 60A DC converter
Or build the board using a PTH12030W/L for even less money. But this would also require adding a filter circuit.
By feeding each plate with it's own voltage (+-+-+-+-+-+-) the current losses should be completely eliminated and there would be no need for neutral plates. The plate voltage can be adjusted with precision thereby maintaining peak efficiency. Current limiting protection is already incorporated into this device.
Assuming 6mmw and running this DC converter at 50A 2VDC or 100W (slightly below it's maximum rated output ) the HHO output would be 600 ml/min. If more HHO is required just add more units. More testing will have to be done to determine if better than 6mmw is possible. I have heard that 8mmw has been achieved by the EBN crew. I envision this small supply being incorporated as part of the dry cell unit, there by reducing the wire harness to a single wire input and reducing losses due to wire resistance.
I'd like to hear feedback on this idea.