Direct current (DC) electricity from a battery or other comparable source is converted into alternating current (AC) power, which can be utilised to run electrical equipment, using inverters. When the electrical grid is down, inverters can be a useful source of AC power in vehicles, recreational vehicles, boats, off-grid systems, and backup power systems. A number of electronic devices can be powered and recharged using the USB connectors, charging ports, and AC outlets found on some types of inverters.