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Why do solar power systems use inverters for alternating-current appliances?

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Diagram of a solar cell showing labeled layers, including a front electrical contact grid, antireflection layer, absorber layer, back junction layer, and back electrical contact layer, with arrows indicating light entering and terminals connecting to a circuit. — solar cell A commonly used solar cell structure. In many such cells, the absorber layer and the back junction layer are both made of the same material.

Solar power systems generate electricity in the form of direct current (DC), which is a steady flow of electric charge in one direction. Because many household and commercial appliances are designed to operate using alternating current (AC)—the standard form of electricity provided by public utility power grids—an inverter is required to convert the DC output from solar panels into the AC power necessary to run these devices.12

In both stand-alone and grid-connected photovoltaic systems, inverters serve as the essential interface between the low-voltage DC produced by the solar array and the AC requirements of the load or the utility grid. Without this conversion, the electricity produced by solar cells would be incompatible with standard AC appliances and grid infrastructure.2