The inverter serves as the critical interface between the solar array and the utility grid, converting DC electricity generated by the solar panels into AC electricity for home use. If the inverter remains off, it could indicate a fault condition triggered by internal diagnostics. These may include ground fault detection, which occurs when the insulation resistance (RISO) falls below safe levels, or grid frequency limits being exceeded, which can prevent the inverter from engaging. The inverter may also turn off if it detects insufficient sunlight or if there are anomalies in the grid voltage that could cause damage to the system.