NOVELTY - Photovoltaic system comprises first and second connected photovoltaic modules; system-monitor (400) to detect power and, in response, to generate a system-on signal to the first and second photovoltaic modules indicative of the presence of power; switch (411) in each module to disable each individual module, where switch is activated by loss of the signal; and connector in each module, coupled to a switch in the module, to connect direct current signal produced by one photovoltaic module to the other photovoltaic module. The switch includes a MOSFET.    USE - Photovoltaic system i.e. solar photovoltaic module safety shutdown system used in case of emergencies.    ADVANTAGE - By installing a switch in each module, it is possible to deactivate each individual module to a level where the voltages will be in the order of 18-50 V or less. At these levels, it is safe to handle the modules or any components of the array. Each module receives a system-on signal, a corresponding logic component, and a switch in or near the module will perform the control of each individual module. These may take the form of simple coils and relays or optical and electronic components. The reliability or cost of these simple components does not pose a cost burden nor a reliability challenge for module manufacturing. Each module has a junction box with a few electronic components in it today (diodes), and the shutdown system can add a few more to the module. The photovoltaic system may use a system-monitor device. This function may be built into the grid-tie inverter or the off-grid battery charger to lower overall parts and costs.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) solar module junction box for photovoltaic system including connected photovoltaic modules; and    (2) solar module switch assembly for photovoltaic system.    DESCRIPTION OF DRAWING(S) - The drawing is a circuit diagram illustrating the components within the system-monitor function.    System-monitor (400)    Low voltage signal pair (402)    Manual switch (403)    Conductor (410)    Switch (411)