The description below is borrowed from Patrick Kelly’s document “D9.PDF”

The current flowing through the cell determines its HHO production. This is an absolutely key factor in gas production, and one of the most difficult to control accurately and economically. The greater the current, the greater the rate of gas production. The current is controlled by the concentration of electrolyte in the water and the voltage across the cell. The voltage across the cell has limited effect as it reaches a maximum at 1.24 volts. Up to that point, an increase in voltage causes an increase in gas production rate. Once the voltage gets over this limit, increasing it further produces no further increase in the rate of gas production.

The arrangement with the three pairs (bottom right in the diagram above) has been working in my car for almost 4 months WITHOUT ANY MAINTENANCE WHATSOEVER. The devices always stay very cool, the water goes down very slowly (lost about 25% in four months), and produces a lot of HHO. With 8 teaspoons electrolyte per cell, it draws a total of 6 amps, or 2 amps per line. This means each cell consumes 6 volts x 2 amps = 12 Watt. That’s bird feed, man. Multiply that by six cells and the entire multi-cell dances on only 72 Watts! It’s like a single high power halogen headlamp. Many car stereo systems today consume more than that.

After 4 months of zero maintenance the water were not very dirty, not for such a long time; the stainless steel electrodes grade 302/304 (not the good grade 316L that I use now) did not corrode by much but I reversed the polarity just in case. Cleaned it all with toothbrush and tap water and it’s almost like new again. I like the idea of having to service the system only 3 times a year!!! What say you?

You can see some more details in the photographs below. The arrangement shown in these photographs is electrically connected in three pairs as recommended above. The HHO is fed from cell #1 to cell #2 and so forth, and finally collected with a SINGLE hose from the output of cell #6.

I’ve been asked by many about the exact advantage, in MPG, of going through the trouble to build and install this arrangement. I have made the tests and the numbers are:

  • The six, drawing only about 6 Amps total, achieved my best mileage ever, 61.13 MPG average (i.e., including uphill) at 52-53 Miles Per Hour. Compared to 51.66 MPG of the 1 cell.

  • The difference in mileage is 18% between the 6-cell and a single one. In other words the multi-cell is 18% more efficient.

Is this impressive? Depends on how important it is to you to save gasoline. As far as I can see the most significant advantage, for me, is being able to drive 4-6 months without maintenance OR refill.


Ozzie Freedom.


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    June 2018
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