LIEBERT 02-791950-00 Emerson

( Brand: Liebert ), ( Manufacturer Part Number: 02-791950-00 )

Review LIEBERT Emerson 0279195000 Used

The **Liebert 02-791950-00 (Emerson 0279195000)** is a high-performance, precision-engineered uninterruptible power supply (UPS) designed to deliver reliable, clean power protection for critical IT infrastructure, data centers, and mission-critical applications. Part of Emerson s trusted Liebert brand, this UPS combines robust power conditioning with advanced battery management to ensure seamless operation during electrical disturbances, outages, or voltage fluctuations. Built with a **double-conversion online topology**, it provides continuous, pure sine wave output, eliminating harmonics and transients that could otherwise damage sensitive electronic equipment. The system s **scalable design** allows for easy expansion, accommodating growing power demands without sacrificing performance, making it an ideal solution for environments where uptime is non-negotiable.

Under the hood, the **02-791950-00** features a **high-efficiency, permanent magnet synchronous motor** that operates with minimal heat generation, reducing cooling requirements and improving overall reliability. Its **intelligent battery management system** ensures optimal battery health, extending lifespan while maintaining peak performance during runtime. The UPS is equipped with **advanced monitoring and control capabilities**, including **SNMP (Simple Network Management Protocol) support**, remote management via **Liebert iQ** or third-party software, and **automatic load shedding** to prevent overload conditions. This level of integration allows IT administrators to proactively manage power distribution, receive real-time alerts, and implement failover strategies with ease.

Designed for **high-density environments**, the **02-791950-00** offers a compact yet robust form factor, making it suitable for both rack-mounted and freestanding installations. Its **hot-swappable batteries** minimize downtime during maintenance, while the **redundant fan design** ensures continuous airflow even if one component fails. The system also incorporates **emergency power-off (EPO) functionality**, allowing for controlled shutdowns in the event of a catastrophic power failure, thereby protecting data and equipment from sudden surges or spikes. With **input voltage ranges spanning 100 240V**, this UPS accommodates global power standards, ensuring compatibility in diverse operational environments.

Beyond its technical specifications, the **Liebert 02-791950-00** embodies Emerson s commitment to **enterprise-grade reliability**, offering **24/7/365 support** and **field-proven durability** to withstand the demands of critical infrastructure. Whether deployed in a small business server room, a healthcare facility, or a financial services data center, this UPS serves as a silent guardian, ensuring that power interruptions never disrupt operations. Its **modular architecture** also allows for future upgrades, making it a cost-effective investment that grows with evolving power needs. For organizations prioritizing **data integrity, equipment longevity, and operational continuity**, the **Liebert 02-791950-00** stands as a dependable, high-performance solution engineered to deliver peace of mind in an unpredictable electrical landscape.

### **Pros and Cons of buying a Liebert/Emerson 02-791950-00 (UPS 2000VA/1500W, Single-Phase, 120V)**

The **Liebert/Emerson 02-791950-00** is a 2000VA (1500W) single-phase uninterruptible power supply (UPS) designed for small to medium business or home office use. Below is a detailed analysis of its advantages and disadvantages, followed by a conclusion and recommendation.

---

### **Pros**

1. **Reliable Backup Power**

- Provides clean, stable power during outages, protecting sensitive electronics from surges, spikes, and brownouts.

- Sufficient capacity (2000VA) for basic office equipment like desktops, monitors, routers, and small servers.

2. **Online Double-Conversion Design**

- Operates in **online mode** by default, meaning it continuously converts AC to DC and back to AC, providing **pure sine wave output** (critical for sensitive devices like medical equipment, servers, or audio/video gear).

- Eliminates harmonics and noise, reducing risk to connected devices.

3. **Modular & Scalable**

- Can be **rack-mounted** (optional rack kit available) or placed on a table, making it versatile for different setups.

- Some models in this series support **battery expansion**, allowing for longer runtime if needed (though this specific model may have limitations verify compatibility).

4. **Network & Management Features**

- Includes **SNMP (Simple Network Management Protocol)** support for remote monitoring via network management systems.

- **USB and serial ports** for advanced configuration and logging.

- Some models offer **USB connectivity for software monitoring** (check documentation for this specific unit).

5. **Good Runtime for Basic Needs**

- With standard batteries, it provides ** 5 10 minutes of runtime** at full load (varies based on connected load and battery health).

- While not ideal for extended outages, it serves as a **short-term safeguard** against brief power interruptions.

6. **Brand Reputation**

- Liebert/Emerson is a well-known brand in critical power solutions, offering **durable construction** and **good customer support**.

- Many users report **reliability** in commercial and industrial applications.

7. **Quiet Operation**

- Designed to run **quietly** compared to some larger UPS systems, making it suitable for office environments.

8. **Surge & Voltage Regulation**

- Protects connected devices from **voltage spikes, sags, and transients**, extending their lifespan.

---

### **Cons**

1. **Limited Runtime**

- The **2000VA/1500W rating** means it can only fully power a small load before shutting down.

- **Example:** A single desktop PC (500W) monitor (100W) router (30W) UPS itself ( 200W) totals ** 830W**, leaving little room for additional devices.

- For **longer runtimes**, you d need **external battery packs** (if supported) or a larger UPS.

2. **No Built-in Battery Expansion (May Require Additional Costs)**

- Some Liebert/Emerson UPS models support **battery expansion**, but this specific model (**02-791950-00**) may **not** have this feature out of the box.

- If expansion is needed, you may have to **purchase additional batteries separately**, increasing total cost.

3. **Single-Phase Only**

- Not suitable for **three-phase equipment** (e.g., industrial machinery, large servers, or high-power tools).

- If you have **three-phase devices**, you ll need a **three-phase UPS** instead.

4. **Higher Upfront Cost Compared to Standby (Line-Interactive) UPS**

- Online double-conversion UPS systems are **more expensive** than **standby (Sine Wave) or line-interactive** models.

- If your needs are **basic surge protection short backup**, a cheaper **standby UPS** (e.g., CyberPower, APC) might suffice.

5. **Battery Replacement Costs**

- UPS batteries degrade over time (**3 5 years** for standard lead-acid batteries).

- Replacing batteries can be **costly** (typically **$300 $600** for a full battery pack).

- Some users report **difficulty finding replacement batteries** for older Liebert models.

6. **Bulkiness & Space Requirements**

- While not extremely large, it still takes up **significant desk or rack space**.

- If space is limited, a **compact UPS** (e.g., APC Back-UPS) might be a better fit.

7. **Potential Overload Risks**

- If connected load exceeds **1500W**, the UPS may **shut down prematurely** or damage the battery.

- Always **check wattage** of connected devices to avoid overloading.

8. **Limited Advanced Features in Basic Model**

- Some **higher-end Liebert models** include **automatic shutdown, advanced logging, or cloud monitoring**, but this model may lack these unless upgraded via software.

---

### **Conclusion**

The **Liebert/Emerson 02-791950-00** is a **high-quality, online double-conversion UPS** that excels in **providing clean, stable power** for sensitive equipment. It is best suited for:

- **Small offices** needing **surge protection short backup**.

- **Home offices** with **critical devices** (e.g., PCs, routers, NAS drives).

- **Environments where power quality is a concern** (e.g., areas with frequent brownouts or poor grid stability).

- **Long-duration outages** (e.g., >10 minutes).

- **High-power loads** (e.g., servers, workstations, or three-phase equipment).

- **Budget-conscious buyers** who can opt for a **standby UPS** instead.

If you **prioritize reliability and power quality** and can **accept its limitations in runtime and cost**, this UPS is a **solid choice**. If you need **longer backup or higher capacity**, consider a **larger UPS model** or **battery expansion** (if supported).

---

### **Recommendation**

You need **clean, uninterrupted power** for **sensitive electronics**.

Your **connected load is under 1500W** (preferably much lower for safe operation).

You **value brand reliability** and **network management features**.

You **won t need extended runtime** (supplement with a **generator or larger UPS** if required).

You need **longer backup power** (look for a **UPS with battery expansion** or a **larger capacity model**).

Your budget is tight (a **CyberPower or APC online UPS** may offer similar features at a lower cost).

You have **three-phase equipment** (a **three-phase UPS** is necessary).

You **don t need double-conversion** (a **standby or line-interactive UPS** could suffice).

This UPS is a **premium choice for critical power protection** but may not be the most **cost-effective** for all users. If your requirements align with its strengths, it is a **reliable investment**. Otherwise, evaluate **lower-cost alternatives** or **larger-capacity models** to better fit your needs.

Details:

Packaging and Handling: Items are safely ESD packaged in custom shipping cartons for protection. All products are guaranteed to be working but may show signs of use. Call to use a shipping service other than the ones listed. The product is used surplus.

part #: 0279195000 price

• $131.25

specifications automationjack:

• brand: Liebert
• mpn: 02-791950-00

offer automationjack:

• sold: 0
• quantity: 2
• started: February 2, 2026
• options: Ship-to-home
• availability: In Stock

general automationjack:

• condition: Used
• Business Industrial > Industrial Automation Motion Controls > Other Automation Equipment

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• city: 1 Millennium Dr, Willingboro, NJ 08046
• # reviews: 188470
• rating: 99.5%

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• other
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• service: Standard
• type: Fixed
• cost: $12.90
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returns automationjack:

• paid by: Buyer
• time: 30 Days
• policy: Returns Accepted
• method: Money back

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