A power management system for a dispenser that includes a passive infrared radiation sensor arranged along the dispenser and configured to detect infrared radiation emitted by one or more users within a prescribed detection range, area, or zone of the dispenser. When the passive infrared radiation sensor does not capture infrared radiation within the prescribed detection range, area, or zone, the dispenser is placed in a low power state with the passive infrared sensor remaining connected to a power source and a controller, a dispensing mechanism, and/or the proximity sensor being disconnected from the power source. Other aspects also are described.