Tripp Lite SU20KRTG 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 SU20KRTG SmartOnline UPS Features,

Battery independent restart
HID-compliant USB interface
Hardwire input; 8 C19 outlets
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
Some external battery configurations require the use of Tripp Lite’s External Battery Configuration Software (see manual)
Intelligent battery management system with temperature-compensated charging extends battery life
Highly efficient economy mode option
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)
Included Parallel PDU with manual bypass switch enables hot-swap replacement power modules at any supported load level
Optional 2POSTRMKITHD supports installation in 2 post 19 inch racks (4 required)
Unique configuration offers 20kVA non-redundant operation and automatic N+1 redundancy at load levels of 10kVA and under
Optional 2-9USTAND supports upright tower placement (2 required)
Supports Emergency Power Off (EPO) via built-in interface
Front panel LEDs and LCD readout with scroll controls
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)
Tripp Lite SU20KRTG 20kVA, 20,000VA / 18,000 watt on-line, double-conversion UPS system in 12U total rack/tower configuration
Compatible with Tripp Lite UPS management card options TLNETCARD, WEBCARDLX, SNMPWEBCARD, MODBUSCARD and RELAYIOCARD