A power inverter is a device that converts direct current (DC) electricity from sources like batteries or solar panels into alternating current (AC) electricity, commonly used in household appliances and electronic devices. This enables the operation of AC-powered equipment when only DC power is available, providing a versatile solution for off-grid or emergency power situations. A common type of power inverter is used in cars, converting the 12-volt DC system in a car, and outputs sufficient power for laptops, USB ports and other types of devices.