Shutdown method for photovoltaic system

A method for achieving power shut down or disconnect at the individual photovoltaic panel level for multiple photovoltaic panels (15) comprises generating a low voltage high-frequency current source signal. The low voltage high-frequency current source signal is transmitted concurrently with DC power to junction boxes (14) of the multiple photovoltaic panels (15) of a photovoltaic panel array. The low voltage high-frequency current source signal is isolated from the DC power. Output terminals of respective photovoltaic panels (15) are short circuited and the respective photovoltaic panels (15) are disconnected from the output terminals in response to the low voltage high-frequency current source signal.