Tripp Lite SU20KRTHW SmartOnline 20,000VA / 20kVA / 18,000 watt online, double-conversion UPS system offers complete power protection for critical server, network and telecommunications equipment in a 12U rack/tower configuration. This system delivers complete N+1 redundancy when used at loads up to 10kVA, and non-redundant operation at loads between 10 and 20kVA. Fault-tolerant auto-bypass prevents unexpected service interruptions during UPS overload or internal fault conditions. Included parallel PDU with manual bypass switching enables hot-swappable replacement of all major UPS system components in both N+1 and combined operating modes. Enhanced availability, fault tolerance and simple hot-swap replacement options make this UPS ideal for advanced networking applications in data centers, computer rooms, network closets and rugged industrial locations.
Tripp Lite SU20KRTHW SmartOnline UPS Features,

Highly efficient economy mode option
Battery independent restart
Tripp Lite SU20KRTHW 20kVA, 20,000VA / 18,000 watt on-line, double-conversion UPS system in 12U total rack/tower configuration
Front panel LEDs and LCD readout with scroll controls
Included Parallel PDU with manual bypass switch enables hot-swap replacement power modules at any supported load level
Hardwire input (3 wire) and hardwire output (3 wire) connections
Optional SU6000XFMR2U transformer offers 120v output in North American 208/240V (L1,L2,G) input configurations
Maintains full-time sine wave output within 2% of selectable 200/208/220/230/240V nominal
Supports 50/60Hz operation for worldwide frequency compatibility
Expandable runtime with optional external battery packs
Applications utilizing the optional network communications card require two accessories (install one per included power module)
Also compatible with RELAYIOMINI module (RELAYIOMINI requires removal of USB interface module)
Optional 2POSTRMKITHD supports installation in 2 post 19 inch racks (4 required)
Optional 2-9USTAND supports upright tower placement (2 required)
Supports Emergency Power Off (EPO) via built-in interface
LED / LCD display panel rotates for viewing in rackmount or tower configurations
External battery packs are field replaceable and hot swappable
Frequency conversion mode enables conversion of 60Hz to 50Hz or 50Hz to 60Hz (no de-rating)
Compatible with Tripp Lite UPS management card options TLNETCARD, WEBCARDLX, SNMPWEBCARD, MODBUSCARD and RELAYIOCARD
Intelligent battery management system with temperature-compensated charging extends battery life
Some external battery configurations require the use of Tripp Lite’s External Battery Configuration Software (see manual)
Unique configuration offers 20kVA non-redundant operation and automatic N+1 redundancy at load levels of 10kVA and under
Supports North American (L1,L2,G) 208/240v hardwire input / output, plus International 230/220/240v (L,N,PE) hardwire input / output