testing peltier TEC1-12706 and TEC1-12715 as thermoelectric generator #2

this test is for TEC1-12715 Sorry that I dont speak - it is filmed at night and my child is sleeping in other room Test platform #2: 2 pieces of TEC1-12715 wired serially left multimeter is showing volts, right is showing Amps output is connected to red powerled coffe maker hotplate is used as heat source, two peltiers are sandwitched between hotplate and CPU heatsink. output was 2.12V and 0.39A Conclusion: seems that less powerful peltier can produce higher voltage and at least when powering this red led it makes more power. It is cheaper to buy and works better. Does it works always like that - to use peltier as TEG, should we use less powerful peltiers?