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Windowsill non-stop solar machines.

My experiments cover ultra-low power pulse motors or pendulums, on solar energy with supercap buffer. They are made to fit on the windowsill.
Sometimes weeks of cloudy sky must be bridged. Daylight supplies enough energy from the small solar panel. A supercap has to buffer the ‘dark times’. Also energy harvesting is subject of my research. See the atmospheric energy post and the soilurine battery post.