Lenovo 5594-8KX User, Installation And Maintenance Manual page 288

Appendix A. Specifications
Transfer time
Power factor
Load crest ratio
260
Online mode: 0 ms (no break); UPS operates in online-dobule conversion mode
High Efficiency mode: 10 ms maximum (due to loss of utility power)
UPS operates in line interactive mode
0.9
3 to 1
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG