Thermoelectric devices generate power when one side of the device is a different temperature from the other. Instead of requiring two different temperature inputs at the same time, a new thermal resonator system takes advantage of the swings in ambient temperature that occur during the day-night cycle.
The system could enable continuous, years-long operation of remote sensing systems, for example, without requiring other power sources or batteries. The system does not need direct sunlight; it generates energy from ambient temperature changes, even in the shade. That means it is unaffected by short-term changes in cloud cover, wind conditions, or other environmental conditions, and can be located anywhere that's convenient.