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Compact Emergency Inverter Systems

IOTA IISC Series 1.0KVA to 2.8KVA 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 IISC Series will supply 1.0KVA to 2.8KVA of emergency power from the battery supply at 2ms transfer time. The IOTA IISC 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 IISC Series is ideal for providing emergency power to extensive 120V, 208V, 240V, or 277V lighting arrangements that utilize multiple lamp and fixture types. The IISC Series conducts monthly and annual tests for operation readiness and logs the test results for reference as needed. The IISC Series features a durable front-access steel compact cabinet designed for increased space savings. Covered by IOTA’s standard one-year warranty.

Input Voltage

Single phase 120V, 208V, 240V, or 277V

Output Voltage

Single phase 120V, 208V, 240V, or 277V



Output Power

1.0kVA - 2.8kVA

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

System Short Circuit


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

380% for 16 line cycles, 125% for 10 minutes

Crest Factor


Operating Temp (inverter)

0° to 40° C

Operating Temp (battery)

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
  • 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/IGBT inverter design for optimal switching 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 Circuit Breaker and Battery Protection
  • User Programmable / Password Protected Interface
  • High-Contrast VFD display screen
  • Includes RS232 Serial Communications port
  • Durable steel compact cabinet design with white finish
  • Forced air cooling only while in the emergency mode with no filter requirement
  • 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