Since this last post I have found out that it is the 1981 and earlier Canadian nickels that are 99.9% Nickel (subsequent Nickels are 75ish% copper) and also I have heard that nickel brazing rod is an affordable and available option (the more expensive the nickel rod, the more pure the nickel is)
http://en.wikipedia.org/wiki/Nickel_%28Canadian_coin%29
I was a mechanic on a US Navy submarine 1977-81, and I didn't pay much attention to the oxygen generator at the time. It used electrolysis to make oxygen, which was stored in a tank and bled into the boats air (the H2 was pumped overboard) I want just the opposite, which is to generate H2 and store it in an old propane tank. I've looked up the company website that contracts with the Navy, but of course, they won't post any specifics about their "proprietary technology".
I have learned from OUPower.com the reasonably efficient design specifics of electrolyzing O2/H2 (Thanks!). Since I intend on generating gasses from a simple home-built wind/water generator, any small in-efficiencies I encounter are not a problem, as I will be getting more H2 than I can use.
One of the big expenses of the "off-grid" lifestyle is the cost of the battery pack. I am currently collecting information on home-made lead-Sulfuric acid batteries, and Edisons Nickel-Iron "Alkaline" batteries. -Ron
"Electricians do it without shorts until it Hertz"