Aar bee enterprises manufactures on line ups .These are based on spwm technology .They come with following features:
On-line dual conversion design
Three phase in, three phase out
Igbt inverter design
Generator compatible
Ups can carry 100% un-balanced load
Extendable run time
Load/battery capacity display
Overload, on-line, battery status led/lcd display
Superior battery management
Rs-232
Cold start
Optional snmp card
