A wireless monitoring system and method of using the same is provided. The monitoring system includes a controller, wireless node assembly (WNA), and light emitting means. The controller is connected to the light emitting means for controlling its operation in response to messages received from the WNA. The messages may include information identifying the location of the WNA, and the power remaining in its power source. In response to the received message, the controller is configured to determine whether the power remaining is below a predetermined value requiring the power source to be recharged. Upon determining that the power source needs recharging, the controller activates the light emitting means such that a light energy is emitted and is in the line-of-sight of a sensor power adapter connected to the power source. The sensor power adapter is configured to convert the light energy into electricity for recharging the power source.