Abstract: Methods and systems for detecting and identifying faults in air-cooled systems are provided. The systems and methods may utilize a prediction model based on an energy balance relationship. In certain methods, one or more measured parameters associated with the air-cooled system may be compared with corresponding parameters generated by the prediction model. One or more faults may be detected and identified based upon deviations between the measured and detected system parameters.

Abstract: Systems and methods of controlling an uninterruptible power supply are provided. The uninterruptible power supply includes an input configured to receive input power, one or more sensors configured to monitor one or more parameters related to the input power, an output, a power conversion circuit coupled with the input and the output, a bypass switch configured to couple the input to the output in a bypass mode of operation, and a controller coupled with the power conversion circuit, and the bypass switch. The controller is configured to receive, from the one or more sensors, values for the one or more parameters, filter the values to determine one or more quality metrics, calculate, based on the quality metrics, a quality measure of the input power, and control the bypass switch based on the quality measure.