I thought I would include a page that describes how to configure a typical electrolyzer. I have received a lot of questions from people about how they should setup their electrolyzer. Please keep in mind that I don't profess to have all the answers. I believe that HHO is constantly evolving, and the topics on this page may change in time. Perhaps this page will help give you a starting point. I will limit my comments to Dry Cell configurations. These types of electrolyzers are currently the most efficient designs.

Plate Gap Voltage (PGV)
Voltage ÷ # Electrodes = PGV
or
Voltage ÷ PGV = # Electrodes
or
# Electrodes * PGV = Voltage

In most cases, you should try to maintain between 2 - 2.4 volts per plate gap. All cells vary due to the following variables: voltage, amperage, electrolyte, plate material and temperature. So, your PGV could vary somewhat.

How many neutrals, again... and why?
You should be aware that applying voltage to two pieces of metal in an electrically conductive solution of water will produce HHO. The negative electrode will produce the Hydrogen, and the postive will produce Oxygen. Electrolysis will begin to occur at around 1.67 volts DC. Most supply voltages are based on current available battery voltages. Let's use 12 volts. By applying that voltage to only 2 plates, the voltage between those plates will be equal to the total input voltage. The problem with this setup is that 12 volts is too high. You want to maintain between 2 to 2.4 volts. This minimizes wasted energy in the form of heat. In order to reduce the 12 volt supply voltage to the desired 2 to 2.4 volts you need to add additional plates that are not electrically connected. These are called neutral plates.

LVHA
If you are adhering to an LVHA (Low Voltage/High Amperage) configuration, then you will first want to determine your desired PGV. Then, verify your supply voltage with a good electrical meter. I will use 13.6 volts supply (typical automotive battery) as an example. Divide the supply by what you want your PGV to be. Let's say we want our PGV to be 2.4 volts. You should get a total of 6 (rounded up from 5.7) plates per complete cell. This means your single cell configuration would be as follows:
+ N N N N -
If you wanted more than one cell in your configuration then you would have the following configurations:
2 cells: - NNNN + NNNN -
3 cells: - NNNN + NNNN - NNNN +
4 cells: - NNNN + NNNN - NNNN + NNNN -
You could continue adding cells accordingly as long as your supply voltage was 13.6 volts and still maintain your desired 2.4 volt PGV! Because HHO production depends on the total amount of surface area within the total cell, the more HHO you can produce.

HVLA
If you have decided to use a HVLA (High Voltage/Low Amperage) configuration, then things get even simpler. Of course, verify your supply voltage with a good electrical meter. Let's use 110 volts (typical wall voltage) as our supply this time. We will refer to RMS(Root Mean Square) voltage, rather than actual voltage, because wall current varies. Also, we are assuming you have built a good bridge rectified power supply that plugs into the wall for power. Electrolysis won't occur with Alternating Current. You need Direct Current. If we divide the 110 volts by the desired 2.4v PGV then you get 46 plates (rounded up from 45.83). You would need a total of 46 plates for this cell configuration. Here are some configurations for a cell using HVLA 110 volts and a PGV of 2.4v:
1 Cell w/ 46 plates: - (44 neutrals ) +
2 Cells w/ 100 plates: - (44 neutrals) + (44 Neutrals) -
Remember, that production depends a great deal on the
surface area of the electrodes. With a cell this large, even a little amperage can produce large quantities of HHO. Make sure you have a well developed Safety Plan!

Verifying your PGV without the math
You can verify your PGV by placing the probes of an electrical meter on two adjoining electrodes, as shown in the following picture:

Always place the positive lead on an electrode that is on the same side as a positive elecrode. Place your negative lead on an electrode that is on the same side as the negative electrode. EXAMPLE: If you were to measure from the middle neutral electrodes, then the negative would be on the left and the positive would be on the right as shown above. This will keep your polarity correct on your meter. You can measure the voltage from any two adjoining electrodes in this way to determine your PGV. You should have the same voltage for each plate gap.

More Coming!