A method for achieving power shut down or disconnect at the individual photovoltaic panel level for multiple photovoltaic panels, the method comprising: generating a low voltage high-frequency current source signal; transmitting the low voltage high-frequency current source signal concurrently with DC power to junction boxes of the multiple photovoltaic panels of a photovoltaic panel array; passing the low voltage high-frequency current source signal through an inductor of each respective junction box to a band pass filter of each respective junction box which is configured to pass a band of frequencies including the frequency of the low voltage high-frequency current source signal and to block frequencies outside of the frequency band of the filter, thereby isolating the low voltage high-frequency current source signal from the DC power; transmitting output of the band pass filter to a precision amplitude detector which detects the amplitude of the low voltage high-frequency current source signal received from the band pass filter; comparing the value of the amplitude of the low voltage high-frequency current source signal detected by the amplitude detector to a voltage threshold to determine if the voltage threshold value has been exceeded; and short circuiting output terminals (54, 56) of respective photovoltaic panels and disconnecting the respective photovoltaic panels from the output terminals (54, 56) in response to the low voltage high-frequency current source signal, to remove output power from at least one respective photovoltaic panel associated with a respective junction box if the value of the amplitude of the low voltage high-frequency current source signal is less than the voltage threshold value, wherein the short-circuit between the output terminals (54, 56) is formed by the inductor connected in series with a first switch that is closed when the value of the amplitude of the low voltage high-frequency current source signal is less than the voltage threshold value, wherein the disconnecting of the respective photovoltaic panel from the output terminals (54, 56) is done by opening a second switch; and wherein switching circuits for the first and second switches include timing elements causing the closing of the first switch for the short-circuiting to occur before the opening of the second switch for the disconnecting. generating a low voltage high-frequency current source signal; transmitting the low voltage high-frequency current source signal concurrently with DC power to junction boxes of the multiple photovoltaic panels of a photovoltaic panel array; passing the low voltage high-frequency current source signal through an inductor of each respective junction box to a band pass filter of each respective junction box which is configured to pass a band of frequencies including the frequency of the low voltage high-frequency current source signal and to block frequencies outside of the frequency band of the filter, thereby isolating the low voltage high-frequency current source signal from the DC power; transmitting output of the band pass filter to a precision amplitude detector which detects the amplitude of the low voltage high-frequency current source signal received from the band pass filter; comparing the value of the amplitude of the low voltage high-frequency current source signal detected by the amplitude detector to a voltage threshold to determine if the voltage threshold value has been exceeded; and short circuiting output terminals (54, 56) of respective photovoltaic panels and disconnecting the respective photovoltaic panels from the output terminals (54, 56) in response to the low voltage high-frequency current source signal, to remove output power from at least one respective photovoltaic panel associated with a respective junction box if the value of the amplitude of the low voltage high-frequency current source signal is less than the voltage threshold value, wherein the short-circuit between the output terminals (54, 56) is formed by the inductor connected in series with a first switch that is closed when the value of the amplitude of the low voltage high-frequency current source signal is less than the voltage threshold value, wherein the disconnecting of the respective photovoltaic panel from the output terminals (54, 56) is done by opening a second switch; and wherein switching circuits for the first and second switches include timing elements causing the closing of the first switch for the short-circuiting to occur before the opening of the second switch for the disconnecting.