The fan with heatsink arrived (it was from local seller), I just ran it of 6 AA (actually 4AA and 2 AAA) batteries, so 9 volts are enough. I'm guessing it will run at 0.2 W since max is 0.36W. With 2% efficiency of peltiers, I need just 10W of thermal energy from compressor. This seems doable, since it consumes 80-90.
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