Can I use an earth battery to run ultra-low-power devices? I made a simple battery with soil, coppertube and a zincplate. The cell voltage is 0.9V and a short circuit makes 200 microAmp. The pendulum consumes about 20 microAmp. A supercap of 10F is buffering battery. Duration tests have still to be done. Also soilcell improvement is part of the project.
The Non-Stop Solar Devices are running for month's and some for years.
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