PWM = Pulse Width Modulation.
I think the idea is that gas production capacity is somewhat limited by the speed the bubbles rise off the plates, so applying power during the times that the gas cannot form just wastes power and puts heat in the cell... ergo chopping the power into intervals long enough to produce a bubble and chopping it off again to give it time to float off the plate gives some efficiency savings.... also there's some theories about cell resonance snowballing the output, and some suggestion that the voltage and current peaks at the edge of the square wave can approach extremely high values which creates effects not otherwise observed in steady state operation.
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I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
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