Abstract: Devices, methods, and systems for non-invasive energy consumption monitoring are described herein. One or more device embodiments include a transformer configured to couple the device to a circuit conductor that is coupled to an additional device, a detection module configured to detect a change in a power signal over the circuit conductor, and a transmission module configured to transmit a unique signal associated with the additional device over the circuit conductor if the change in the power signal meets or exceeds a particular threshold.

Abstract: A process includes measuring internal variables and external variables in a commercial refrigeration system, and calculating a daily aggregate for each of the variables. A local energy consumption model and a long term energy consumption model are created. Daily aggregates that contain an anomaly are removed from the long term energy consumption model before creating the long term energy consumption model. The energy consumption deviation estimated by the local energy consumption model is compared with the energy consumption deviation estimated by the long term energy consumption model. A temporary deviation is detected from the local energy consumption model and/or the long term energy consumption model. A continuously increasing degradation in relation to the long term energy consumption model is detected, and a long term degradation rate is calculated.