OK Gus here we go again,
If I build a build a unipolar cell in this configuration []+ - + - + [] + - + - + [] + - + - + [] + - + - + [] + - + - + [] + - + - + [] + - + - + [] with 9 square inches of emmisive surface area on one side of one plate running at 13.8 to 14.2 volts. And assuming that I am running full strength electrolyte. I should be making approximatly 9.03 liters of gas at 18 amps (assuming 14 amps per liter) and from around 1.97 to 2.03 volts per group.
I hope these numbers correct.