An uninterruptible power supply (UPS), or sometimes called an Inverter with battery backup is a device which is inserted between the source of power (typically commercial utility power) and the load connected to it. When a power failure or abnormality occurs, the UPS will effectively switch from utility power to its own power source almost instantaneously.

An uninterruptible power supply (UPS), or sometimes called an Inverter with battery backup is a device which is inserted between the source of power (typically commercial utility power) and the load connected to it. When a power failure or abnormality occurs, the UPS will effectively switch from utility power to its own power source almost instantaneously.