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Why to Use and Why to Avoid Using Modular UPS Systems

Modular UPS systems are recently gaining momentum due to an attractive concept to meet power protection needs as you grow. The concept enables UPS capacity or redundancy to be increased when needed by means of small, lightweight, compact, hot-swappable, low-cost modules without requiring additional floor space. The merits come with some drawbacks however, the article considers both.

The modular UPS approach has the following advantages over standard UPS solutions:

1.Lower floor space.

Most current three-phase UPS systems have scalability, which allows additional units to be added in parallel for additional power or redundancy. Modular systems are based on a rack-type enclosure that includes the battery cabinet at its bottom and small, lightweight, interchangeable modules stacked on top of each other that can be added whenever needed. This vertical scaling approach takes up about 25% of the floor space compared to standard UPS units with the same total power capacity.

2. Higher power availability.

UPS system availability is defined as the percentage of time that conditional power is available. If a UPS never failed, its availability would be 100%. Unfortunately, the UPS systems or its backup batteries fail and during the repair time there is no conditional power to protect the load. The modular approach enables repair times to be reduced to the few hours it takes for a technician to arrive and replace the faulty module, compared to the typically 24 hours or more for a service engineer to arrive and fix the system.

3. Higher efficiency.

The efficiency of the UPS reaches its maximum level when the load is at its maximum rate. The ability to increase the power of the UPS by adding small modules when needed, while maintaining a high ratio of total load to the total capacity of the UPS, provides the most efficient solution.

4. Lower probability of UPS failure during maintenance.

Reviews show that 30% of UPS failures are caused by human error during UPS repair or maintenance. The modular approach enables the replacement and isolation of the faulty module in place, which is sent to the service center for repair, reducing the possibility of UPS failure during service.

The modular UPS approach has the following disadvantages over standard UPS solutions:

1. Limited output power.

A modular approach requires a relatively high amount of small and lightweight parallel power modules. Most UPS systems are based on modules, which can be handled by a single person, placed in a 19-inch rack. For additional power, manufacturers recommend adding additional racks in parallel. The probability of failure when more modules are connected reduces the Availability advantage. In addition, the hassle and high maintenance costs will also increase as the number of modules increases, making the modular approach impractical for systems exceeding 4 to 5 modules in parallel.

2. Single high probability of failure (SOP).

Unlike conventional stand-alone UPS systems, each equipped with all the necessary UPS function blocks. A single failure in some functional component, if common to all modules in the rack, such as the common battery bank, transfer switch, control and display units, can cause total output failure.

3. High Initial Investment.

Generally, the initial installation of a modular UPS includes the Rack and all the usual components. However, this investment may pay off in the future due to higher efficiency and reduced operating costs, as well as reduced financing costs associated with the Grow as you Go approach that modular UPS architecture provides.

Conclusion In conclusion, the modular UPS approach is not always the best solution for all scalable UPS needs, but should be thought of as part of an overall UPS strategy. In addition, to see the whole picture, choosing a modular approach requires thorough knowledge of the particular UPS design, including detailed information about common items, not always provided by UPS manufacturers. .

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