
So now being a little older I come across the concept of the Earth Battery. This is pretty much the same as the potato battery except that you just stick some copper and galvanized steel in the ground somewhere and get about 0.5 volts of power with very low amperage. I also now know that you can increase the voltage by putting several in series or increase the amperage by wiring them in parallel... or increase both by doing a combination of the two.
There is also a little gadget called a joule thief http://en.wikipedia.org/wiki/Joule_thief that will boost the voltage at the cost of amperage. You can apparently run over 100 led's or even a florescent tube with a single earth battery cell using one of these.



Now 0.096 watts is not much power, a AA batter is about 1.5 volts at 4 amps or about 6 watts, so it would take about 60 of my buckets of dirt to generate the same current as a AA battery. However, there are a lot of low power appliances that can make use of this, such as small lights, radios, telegraphs and fans to name a few. These are not that important here, but are vital in most third world countries, and may become important in a SHTF scenario here someday.
For comparison, I have a 50 watt solar panel worth about $250. So it would take about 2600 buckets (or cans) of dirt to accomplish the same thing, except that they work 24 hours a day instead of about 6 for solar so really it would only take 650 cans of dirt to accomplish the same thing as a $250 solar panel.

I will post more after I try a few more combinations and see how they work over time. I also found some similar methods of generating electricity from static, radio, and cosmic rays... basically from the air, that I intend to try out. For more information start here: http://en.wikipedia.org/wiki/Earth_battery and then do a youtube search on "earth battery".
My parents were missionaries in Kenya, E. Africa when I was a kid. Perhaps that is why it seems so strange to me that such a basic technology that we have known about since 1841 has not been utilized where it could make a huge difference. For the average person living in a third-world country the day is only as long as there is daylight, and most of that is spent working to try to stay alive. If they want to go to school they often have to do it in the evening, usually using a campfire or a kerosene lantern for light. Both of these are really hard to read by, are expensive, produce lots of toxic fumes and sometimes burn their house down. Fires cause all kinds of lung and eye problems, and babies often roll into the fire when someone is not paying attention and spend the rest of their lives covered in burn scars. Often the solutions to this such as solar panels are too expensive to buy and then require rechargeable batteries to maintain. However the problem can apparently be solved with six empty aluminum cans some lumps of charcoal, dirt, water and about 2 feet of small wire. If you know people helping in third world countries please let them know.
part 2 here