I am still developing my project. It is not ready yet, but I would like to share with you two things. The first one is the plot of TEG voltage just after I turn off the hot water tap.
This data is when the TEG is under load (STK temperature demo). The board is still operational for over 15 minutes. This is how the device can still harvest and store energy after the water stops to run.
The other thing was a little bit unexpected for me. I have noticed this after some time. When hot water runs the TEG gives a little over 55 mV under load (constant conditions). When I checked the LTC efficiency plot, I realized that these 55 mV hit the efficiency sweet spot – which is always desired when using harvester chips.
