APC Smart-UPS On-Line systems use online double-conversion topology so the supported load is continuously supplied from the inverter rather than waiting for a transfer event when utility power fails.
APC SRT examples span rackmount and tower configurations and are used for critical servers, storage, voice/data networks, medical labs and light industrial applications. Models differ in kVA/kW, voltage, receptacles, rack height and battery expansion.
Extended-runtime SRT models can support APC external battery packs, but the number and battery model depend on the UPS. Some configurations also use step-down or isolation transformers, bypass products and network management.
Online double conversion is a strong fit for sensitive equipment, poor utility power, generator-backed systems and applications that require zero transfer time to battery operation. The topology also allows the UPS to regulate output independently from a wider range of input conditions.
For 208V systems feeding 120V loads, certain Smart-UPS On-Line configurations use an APC step-down transformer. Verify capacity, receptacles and installation height as part of the complete rack design.
The UPS rectifies incoming AC to DC and continuously inverts DC back to regulated AC for the load, which eliminates transfer time when the input source is lost.
Many SRT models support compatible external battery packs. The allowable battery system and quantity depend on the exact UPS model.
