Today I did some successful trials with energy harvesting from a hot water  tap. This post is just a teaser, because it is almost midnight and I have to get up early. The photo below presents a bathroom battery with a TEG attached to and a multimeter (mV). The Peltier module is without load in the picture. When it is connected to LTC harvester chip and hot water runs from the tap, the voltage is about 55 mV.

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As Victor stated and I also agree, energy harvesting is very tricky. You have to use unconventional ways and think outside of the box. However, I believe I have found the harvesting solution for my project and I will use this method in my batteryless carbon monoxide detector.

Stay tuned for my next post, in which I will describe in details this experiment, give some measurements data and energy estimation for my project.