When an inverter in a photovoltaic (PV) system is switched off, the input power effectively becomes zero because the current (I) produced by the PV panels drops to zero, regardless of the voltage (V) remaining relatively stable. This indicates that when the inverter is off, it does not draw power from the panels, leading to no power output (P=VI=0). The discussion raises questions about the inverter's disconnection from its source and the implications of resistance changes, but ultimately, the key point is that power production halts when the inverter is not operational. The inverter's operational state directly affects the system's ability to generate usable power from solar energy. Understanding these dynamics is crucial for optimizing PV system performance.