On-line UPS have superior voltage regulation and conditioning features than off-line and line interactive designs. They are generally considered essential for IT servers that house critical applications, for sensitive electronic equipment where mains power might be subject to fluctuation or for use with a diesel generator.
In on-line double conversion technology, incoming mains power is converted into DC power by the rectifier / charger. The DC is converted back into clean AC by the inverter and fed to the load, which is fully supported under normal conditions. When a mains failure occurs, the inverter draws DC power from the battery instead of the rectifier. As a result, on-line UPS provide a no-break transfer to battery power on mains failure.
Continuous & total power conditioning
Failsafe/overload protection with static bypass facility
No break on mains failure
Wide input voltage tolerance
Recommended with Generator sets
More expensive than other types of UPS technology