Hydrogen Generator - Plans, Forum & Blog  There are many websites that promote their hydrogen generators for the automobiles.  A business associate recently asked our opinion on a certain company's lower than usual cost product.  We told him to ask the company the following question, "Are you using a single cell hydrogen generator or a multi cell because we heard a single cell hydrogen generator has many heat problems."  The sales person told him that they were in fact selling a single cell hydrogen generator and that they were in fact having heat problems and their solution was to later send out a radiator for the hydrogen generator.  Single cell hydrogen generators do not give enough electrical path so all of the amps turn into heat which causes a runaway reaction.  The more heat, the more amps drawn down which more amps are turned into more heat which draw down more amps, etc.  Learn more about hydrogen generators for your automobile. Homemade Hydrogen Generator Homemade hydrogen gas generators can be as simple as tying stainless steel plates together and electrifying them and as advanaced as a multi-cell stainless steel hydroxy generator that can produce a liter or two of gas per minute.  There are many options available on the internet.  The biggest question that needs to be answered is what will you be using the hydrogen generator for and how much gas is needed?  One of the best documents Umpua Energy, Inc. has seen on the internet is the Tero cell - and we have actually built one.  It is a fun project and the cell produces nearly two liters per minute of hydroxy gas.  Note: To avoid a run away reaction, it is recommended that you control the amperage to the hydrogen generator by using a PWM circuit that you can buy from several sources within Ebay. Cornish Hydrogen Generator The Cornish Hydrogen Generator is an interesting proposition, but not energy effecient from a cradle to grave standpoint.  The premise is that scrap aluminum is combined with sodium hydroxide and water which actually causes a chemical reaction strong enough to break apart the water into hydroxy gas.  Alumina Oxide remains which could be smelted and turned back into aluminum.  At face value it looks like a great recycling scheme but after measuring the amount of electricity it take to get the alumina back into aluminum.  In addition, the process is very dangerous as the chemical reaction is difficult to control.  The more heat the more reactive which emits more heat and so on.  While the Cornish Hydrogen Generator is a fun (but dangerous) experiment, we do not see any commercial viability for the technology.  Note:  If your kids start buying a lot of Red Devil Lye, be advised that they could do serious damage and no one likes a homeland security raid on a sunny afternoon.