Why are backup AC generators included in many commercial AC UPS and DC power systems?

Backup AC generators are included in many commercial AC uninterruptible power supply (UPS) and DC power systems primarily to provide AC power during extended utility interruptions. These generators ensure that critical systems can maintain operation when there is a prolonged outage of primary power.

When utility power is lost, a UPS system typically takes over immediately to supply temporary power, but its capability to sustain power is limited by battery life. In the event of a longer downtime, backup generators kick in to provide a reliable source of electricity, allowing systems to run continuously without significant interruption. This is particularly vital for businesses and facilities that rely heavily on continuous power for operations, data integrity, and safety systems.

Incorporating backup generators into power systems not only enhances reliability but also ensures that operations can continue seamlessly, reducing the risk of data loss or service interruption. This makes the backup generator a critical component in facilities where uptime is essential.