Electrical device that converts direct current (DC) to alternating current (AC).
From Wikipedia: An inverter is a power electronic device or circuitry that changes direct current (DC) to alternating current (AC). The resulting AC frequency depends on the particular device employed. The input voltage, output voltage and frequency, and overall power handling depend on the design of the specific device or circuitry.
Solid-state inverters have no moving parts and are used in a wide range of applications, from small switching power supplies in computers to large electric utility high-voltage direct current applications that transport bulk power. Inverters are commonly used to supply AC power from DC sources such as solar panels or batteries.