6kVA Scalable UPS 200V Double Conversion Online

M90S-2S 6kVA Scalable UPS

The M90S-2S 6kVA Scalable UPS is a flexible solution that combines continuous power availability and the highest efficiency for mission critical applications.

M90S provides unity power factor output (kVA = kW) providing maximum usable power and avoids any need to oversize the UPS. Maintenance bypass and output
distribution within the UPS frame eliminates the need for external component connections, reducing installation costs.

The flexible M90S easily installs into a standard rack enclosure with optional rail kit. Output receptacles can be customized to meet your specific needs.

  • The Double Conversion Online technology, protects attached critical equipment by providing stabilization and power conditioning to incoming electrical power.
  • Dual inverter design which provides selectable output voltages of 208/120V, 240/120V,230/115V, or 200/100V without the need for transformers.
  • Future proof expansions, connect up to EIGHT battery modules for increased backup run-times now or in the future!
  • Purchase with confidence!  The M90S-2S 6kVA UPS is backed by an industry leading 3-year product warranty and a $50,000 Load Protection Policy.
  • For product configuration support and quotations please contact us via Chat, Phone or email at sales@republicpowersystems.com  
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Product description

Features of the M90S-2S 6kVA Scalable UPS include:

The M90S 6kVA Scalable UPS is a modular, flexible solution that combines continuous power availability and the highest efficiency for mission critical applications.

  • POWER CAPACITY: 6kVA / 6000 VA / 6000 Watt capacity                                CLICK HERE TO CALCULATE YOUR BACKUP POWER REQUIREMENTS 
  • INPUT VOLTAGE: 120/208V or 120/240V & 50/60Hz auto-sensing (2PH+N+G)
  • RUN TIMES: 9min. @ 100% full load, 21min. @ 50% (UPS + 1 Battery Module)
  • SCALABLE RUNTIME: Support for up to EIGHT additional battery packs for extended runtimes up to 133min. @ 100% full load, 220min. @ 50%
  • OUTPUT VOLTAGE: 120/208V or 120/240V & 50/60Hz ± 0.1Hz; (2PH+N)
  • UPS TOPOLOGY: Double Conversion Online
  • EFFICIENCY: Up to 98% ECO mode, 93% online mode
  • COMMUNICATIONS INTERFACE: RS-232, USB, EPO, intelligent slot for optional cards (Web/SNMP, Relay, Modbus)
  • WARRANTY: 3 years electronics, 3 years battery warranty, optional 5 year warranty available (USA and Canada)
  • OPTIONS: L14-30P line cord, receptacle panel, extended battery cabinet, 5 year extended warranty, 4-post rail kit

Benefits of the M90S-2S UPS include:

Reduce power consumption and increase end to end efficiency with this powerful single-phase uninterruptible power supply.  Designed for high density critical loads, the M90S-2S delivers industry leading reliability, efficiency and flexibility. Output voltage and frequency are programmable to meet a wide range of US and international requirements.  M90S-2S has a high capacity internal charger model available for connection to matching hot swappable batteries or large external battery systems.

HIGHLY CONFIGURABLE Hardwired input and output with terminal block connections or optional input cord and output receptacles

LCD DISPLAY LCD display of power metering for individual phases and system summary6kva scalable ups

LONGER RUN TIMES Modular battery packs are available for extended battery runtimes

DUAL VOLTAGE OUTPUT 240/120V or 208/120V supports mixed voltage loads and receptacle types

HOT SWAPPABLE COMPONENTS Integrated maintenance bypass allows UPS electronics and replacement of the batteries to be serviced or replaced without interruption to critical load

RACKMOUNT KIT Up to 6kW of power handling capability in a rack mount configuration

REDUCE ENERGY COST Best-in-class energy efficiency provides lowest energy consumption and heat output

$50,000 LOAD PROTECTION POLICY Offers protection against damaged connected equipment

Power Protection offered by the M90S-2S UPS:

  • Power conditions such as electrical surges and sags
  • Total loss of electrical power or hard power “re-boots”
  • Unstable incoming power caused from outdated or faulty electrical wiring and or power distribution equipment
  • Harmonic interference from neighboring “high power draw” equipment
  • Severe weather events such as lighting storms, ice and snow storms and downed power lines
  • Unstable power generation from local utilities or on-site generation

Click here to learn more about the TOP 10 POWER ISSUES and UPS power protection features

Wide Power Input

The M90S-2S 6000VA Scalable UPS supports incoming wide AC power input. The automatic voltage regulator (AVR), protects the UPS and connected equipment from adverse voltage conditions. This wide AC input capability can offer sag and surge protection without engaging the backup batteries of the UPS. This will reduce the stress on connected critical equipment and extends the battery life of the UPS.

Double Conversion Topology

Double Conversion Technology

Double Conversion Technology

The M90S-2S 6kVA Tower UPS is a true online double conversion uninterruptible power supply.  Incoming AC utility power is fed to the UPS’ rectifier converting it from AC to DC power. The converted DC power routes to a battery charging circuit and to the inverter for conversion back to AC power. The resulting “double converted” electrical power is pure sine wave output providing near perfect electrical power for connected equipment.

To ensure 7/24 up time the double conversion UPS topology utilizes a static “automatic internal bypass switch” within its circuity design. If the M90S-2S 6kVA UPS detects a system failure, audible alarms will sound as the bypass switch is engages. This routes power around the failed UPS and ensures critical load power to target equipment.  This very important feature allows for 100% up time for critical equipment during repair or module replacement.

In the event of total power failure, the UPS will power off the rectifier when the loss of power is detected. The UPS’ internal backup batteries will continue to supply DC power to the inverter. There is no transfer time as the transition to battery power is instantaneous. This feature provides true uninterruptible power to mission critical equipment.

Technical Specifications



Rated Power Capacity (Apparent/Active)


Voltage/frequency nominal

120/208V or 120/240V & 50/60Hz auto-sensing (2PH+N+G)

Voltage/frequency range

152-269VAC* (L-L) / 40–70Hz


120/208V or 120/240V & 50/60Hz ± 0.1Hz; (2PH+N)

Rated Frequency

50/60 ± 0.05Hz

THD (full load)

<=2% (Linear Load); <=3% (None-linear Load)

Efficiency (Maximum%)

98% ECO mode, ≥ 93% online mode

Overload Capacity

> 150% for 200ms
100% – 110% for 30 min
110% – 130% for 5min
130% – 150% for 10s

Nominal voltage


Max charging (adjustable)


Optional Battery Enclosure

7 Slots for additional battery modules

Battery Enclosure

17.4”W x 33.7”D x 45.5”H (24U) / 162 lbs

Power Module

16.3”W x 24” D x 5.2”H (3U) / 49.6 lbs

Battery Module

16.3”W x 24”D x 5.2”H (3U) / 115 lbs

Operating Temperature

0–40°C (32–104°F)**

Operating Elevation

5,200 ft above sea level**

Acoustic Noise

< 58dBA at 1m


UL-1778 (TUV)


RS-232, USB, EPO, intelligent slot for optional cards (Web/SNMP, Relay/dry contact, Modbus)


3 years battery warranty (USA and Canada)
3 years electronics

Whats in the box

RS-232 Communication Cable
USB cable
User Manual x1
ViewPower Software

Available Options

2-post Shelf Kit
4-post Rail Kit
5 year extended warranty
Extended Battery Cabinet
L14-30P Line Cord (6kVA)
output distribution
Receptacle Panel

Estimated Run-Time

Battery Run Time Graph