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NERM Series 20-100 KVA Three-Phase Modular / Redundant True Online UPS Systems


  • High Input Power Factor (>0.99) With Low Input THD-i (<3%)
  • Adaptability For Linear and Non Linear Load
  • Low Audible Noise System Design (<55db)
  • Double DSP Controller For Each Individual Power Module
  • Digital Control For All Major UPS Subassemblies Including Rectifier, Inverter, Battery Charger, and Battery Discharge
  • IGBT Modules Rather Than Discrete Semiconductor Components Are Used In the Power Module For High Reliability
  • Conformal Coated Boards For Humidity Resistance
  • Available PDU With Circuit Breakers and MS Connectors
  • Built In Circuit Breakers For Cabinet AC Input, AC Output and Maintenance Bypass
  • Digital Paralleling Technology With Very Low Circulating Current Between Power Modules
  • Front Access Cabinet With Both Top and Bottom Cable Connections
  • Each Individual Module Is Configured With An Independent DSP Controller To Avoid Single Point Of Failure Risk
  • Generator-Friendly Interface
  • RS232, 485, and Dry Contacts All Standard
  • SNMP Available


Nova Electric’s Rugged NERM-Series True Online UPS provides a modular backup solution for rugged military data centers, computer systems, and any other critical equipment which demands dependable backup power in harsh environment applications. The NERM’s state of the art design combines the latest IGBT three-level technology along with modern DSP Control for maximum reliability, low THD-i, and extremely high system efficiency. Modules can be stacked from 20 KVA to 100 KVA, offering hot-swappable flexibility with the highest quality. Power expansion is very simple to achieve by adding more individual power modules to the system, which can reach 100 KVA power. Two racks can be paralleled to reach 200 KVA power. These units are the ideal choice for:

  • Shipboard
  • Shelter Mounted
  • Carrier Based Systems
  • High Shock Applications (With Shock Mounts)
  • Mobile Data Centers


Each UPS power module is designed to be hot swappable for hassle-free power expansion and system maintenance. Each module is controlled independently, thus avoiding a single point failure risk. If any individual module fails or disconnects, the system continues to operate and supply power without interruption, ensuring a high level of reliability and protection.


The modular flexibility of the NERM-Series UPS dramatically reduces technician time spent on installation and maintenance. A large touchscreen LCD panel ensures that users can quickly and easily access vital information.


Each UPS module contains a powerful 3.2 KW battery charger, and up to 4 modules can be paralleled for 12.8 KW maximum battery charging capacity. These chargers are DSP
controlled with intelligent digital algorithms designed specifically to prolong battery life.


Each individual power module and the overall system are protected by both hardware and software. Protection functions include abnormal current, incorrect input or output voltage, over temperature, and short circuit. The combination of these hardware and software protection functions results in extremely high reliability, with a very user friendly interface.


The low-loss integrated three-level IGBTs used in each NERM-Series power module result in higher efficiency and enhanced reliability due to lower heatsink temperatures.


All cabinets within this system are rugged and when shock mounted will pass the barge test specified in MIL-S-901D, as well as shock and vibration called out in MIL-STD-810F, and MIL-STD-167-1 vibration.


These units contain input Power Factor Control which allows very low input THD-i, along with high PF at the input. NERM UPS can meet MIL-STD-461 EMI requirements optionally, along with MIL-STD-1399 for input THD-i, phase balance, and other relevant characteristics.


Hot swap building block 20 KVA modules @ 120/208 VAC
• Independent control
• Designed for parallel operation with active current sharing
• Designed for (N+1) redundancy
• Capable of hot swap
• Automatic mechanical disconnection in case of failure or maintenance


An optional cabinet which provides for input and output isolation is required for any voltage without a neutral. This cabinet may also be used for applications with a neutral where
complete Input / Output isolation is desired. This cabinet can also contain a mechanical rotary manual bypass switch used to isolate the UPS electronics enclosure for safe service while maintaining power to the load. When manual bypass is used, customer AC Input / Output will be made to this cabinet. This cabinet will also contain an input circuit breaker and EMI filtering when MIL-STD-461 requirements are specified. An output PDU may be included in this enclosure. We can provide an array of output distribution with various customer specified MS connectors.


The system batteries may be housed in a separate (matching) enclosure with a protective circuit breaker, or separate racks depending on run time desired. When the batteries are housed inside the matching enclosure, multiple strings will be used in parallel for highest redundancy. The batteries may be drawer mounted or on rails within the enclosure.