Methods of operation of a self-powered power sensor (SPPS) are provided for the measurement of the likes of current, power, power factor, and other parameters related to the power consumption, at points of interest, such as circuit breakers, machines, and the like. Each SPPS is enabled to communicate its respective data, in an environment of a plurality of such apparatuses, to a management unit which may further process the data sent thereto, as well as communicate back to the SPPS for the purpose of synchronization of, for example, clocks of the SPPS and the management unit.