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Development of wearable sensor node for continuous monitoring of respiratory sounds presents several research challenges. In this article we analysed power consumption of such node in scenarios of on-node signal processing, and compressive sampling with low frequency data streaming. Onset of requirements defined by each scenario, we reviewed state of the art of recent commercial off-the-shelf (COTS) components for implementation of the sensor node. Power consumption on component scale was modelled by their spreadsheet data, and on scale of sensor node by behavioural diagrams. As a result, we estimated total sensor node power consumption and compared consumption shares of each subsystem. Total power consumption was estimated to 1.2-1.4 mW for continuously operating node.