Abstract: The present disclosure provides systems, devices, and methods of utilizing signal-processing techniques to detect at least one degrading component of a power conversion unit located in an energy generation or storage unit. The systems, devices, and methods of the present disclosure are applicable to a wide range of energy generation and energy storage units, from commercial power plants to residential solar applications to electric vehicles. The present disclosure provides a real-time data-acquisition system that extracts actual performance data during the operation of the unit, and compares its performance with historic performance (especially changes over time or derivative performance information) in order to predict device performance or failure.