I was experimenting with various metals and locations for making an earth battery. By placing two different metals in the earth you can produce power.
I am looking for the best combination of metals to make an earth battery. And I am experimenting with different locations in the yard. The soil conditions and moisture levels will effect the power output of an earth battery.
So far I have tried combinations using aluminum, steel and copper. I hope to expand the experiments using different metals later.
You can connect multiple earth batteries in parallel to increase the power output. I am still in the microamp ratings yet though so I have a long way to go before I can light an LED.