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Of course fluids can leak, freeze or degrade/decompose. You can also measure the power generation by using the panel's current to heat something and get on the roof every 15 minutes to read the mercury thermometer and write it in your little black lab book with a nice sharp pencil (you can still get these if you know where to look). The heater will only lower the system's efficiency by about 50%. All of this require complex pipework. But hey, if you want all such complexity, be my guest! The whole point with arduino/esp is that it is so much easier. Eco, I think yours is a job well done! Congrats! BTW, your English is much better than most people's Finnish.
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