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Modular Emergency Inverter Systems

IOTA IISM Series 1.0KVA to 2.0KVA Inverter Systems are UL Listed single-phase sine wave output inverters designed to provide power to designated emergency lighting fixtures in the event of a loss of normal power. In a power loss situation, the IOTA IISM Series will supply 1.0KVA to 2.0KVA of emergency power from the battery supply at 2ms transfer time. The IOTA IISM Series works in conjunction with any lighting load type and is capable of operating normally-on or normally-off designated fixtures in the emergency mode. The IISM Series is ideal for providing emergency power to extensive 120V or 277V lighting arrangements that utilize multiple lamp and fixture types. The IISM Series conducts monthly and annual tests for operation readiness and logs the test results for reference as needed. The IISM Series features a modular design with electronics and batteries in separate durable, steel cabinets, allowing for versatile mounting and expandable load capability. Covered by IOTA’s standard one-year warranty.

Input Voltage

Single phase 120V or 277V

Output Voltage

Single phase 120V or 277V



Output Power

1.0kVA - 2.0kVA

Transfer Time


Emergency Operation

90 minutes

Load Power Factor Range

.5 lagging to .5 leading

THD (input/output)

<10% / <3%

Input Power Walk-in

Limiting inrush current to <125%,
10 times for 1 line cycle

Synchronizing Slew Rate

1Hz per second nominal

Static Voltage

+/- 2% (Load current change)
+/- 12.5% (Battery discharge)

Dynamic Voltage

+/- 2% (+/- 25% load step change)
+/- 3% (+/- 50% load step change)
recovery within 3 cycles

Inverter Overload Threshold

125% for 10 minutes

Operating Temp

20° to 30° C

Storage Temp (electronics only)

-20° to 70° C

Relative Humidity

< 95%


Maintenance-free Valve Regulated Lead Acid (VRLA)

Audible Noise (standby mode)

45 dba @ 1m


UL 924 Listed
find the UL Mark on this product

*Input +/- 3%, Output in emergency +/- 0.05Hz

Advantages and Features

Product Advantages

  • Single-phase emergency system with exceptional 98% power efficiency
  • Modular design allows for upgrading load size capability as needed
  • Fast transfer speed for compatibility with all lighting load types
  • Provides full light output in the emergency mode
  • Conducts required monthly and annual tests for operational readiness and logs test, event, and alarm data


  • PWM/MOSFET inverter design delivers high efficiency, low THD, and fast transfer speed
  • Micro-processor controlled, temperature compensating charger
  • 120 to 277 Input/Output Voltage Options
  • Valve Regulated Lead Acid (VRLA) batteries provide long life and are maintenance free
  • Low Battery Voltage Disconnect protects batteries against deep discharge
  • Includes Input and Output Circuit Breaker Protection
  • User Programmable / Password Protected Interface
  • High-Contrast VFD display screen
  • Durable steel compact cabinet design with white finish
  • Meets or exceeds all National Electrical Code and Life Safety Code Emergency Lighting Requirements
  • Covered by IOTA’s standard 1-Year Warranty on all electronic components and pro-rated warranty on batteries
  • Factory Startup and Training available