For fun, I am designing a electrical generator powered from natural gas.
I have ordered 20 count of these devices: https://www.ebay.co.uk/itm/Thermoelectric-Power-Generator-Peltier-Module-TEG-40x40mm-High-Temperature-150-/172159882510
- 20 degree temperature difference: open-circuit voltage 0.97V, generated current: 225MA
- 40 degree temperature difference: open circuit voltage 1.8V, generated current: 368MA
- 60 degree temperature difference: open circuit voltage 2.4V, generated current: 469MA
- 80 degree temperature difference: the open circuit voltage 3.6V, generated current: 558MA
- 100 degree temperature difference: open circuit voltage 4.8V, generated current: 669MA
My intended design is a stack over a natural gas flame on the stovetop, with a cast iron heat sink, copper plate, TEG array, and then topped with a copper plate with a heat exchanger for cold water flow from the tap.
The max rated temperature on the TEGs is 150˚C and I expect the wintertime tap water to come in around 5˚C.
Here is my question: Assuming I will achieve 150˚C / 5˚C, can I expect even more power than 4.8V * 669MA? Or a different result?