Originally Posted by
keiththevp
As an hho cell runs it generates heat and warms the electrolyte. This causes a lower resistance in the water therefore allowing a higher draw of current. So if you start your cell at say 10 amps after eight hours it could easily hit 18-20 amps. So the PWM basically turns the power on and off at a high frequency in order to keep the average amp draw at your desired setting. So in the same previous scenario you could set the PWM for 10 amps and it will stay there, instead of slowly increasing to 18-20 amps. Hope that helps that is about as basic of a description as I can make.