Over the years, data centers have used multiple high-capacity UPS systems to obtain "N + 1" redundancy and ensure high power availability for their critical systems. Recently, the trend has been to use smaller modular systems that can be expanded according to load requirements. In fact, the modular UPS system is one of the fastest growing products in the three-phase UPS industry. This article will take Kstar Modular UPS as an example to describe the characteristics and advantages of modular UPS.

Modular type UPS is a high power UPS system which divided into several sub modules in parallel, controlled by the optimized system, realize the system online expansion and maintenance, and greatly improve the system reliability, availability and energy saving effect, reduce the maintenance cost, in recent years has gradually become the mainstream choice for customers. 

Kstar modular UPS machine efficiency can be as high as 96.5%, minimizing UPS energy consumption. The modular design and the N + X parallel redundancy technology, making the expansion easier as well as reducing initial acquisition costs. 

Thanks to its advantages, Kstar modular UPS has been widely used in data processing centers, computer rooms, telecommunications, finance, securities, transportation, taxation, medical systems and other fields. 

Features of Kstar Modular UPS: 

1、Digital Control 

All components of Kstar modular UPS are digitally controlled, and the performance indicators of UPS are excellent. The system has a high degree of stability, and has self-protection and fault diagnosis functions. In addition, it can also avoid analog device failure and makes the control system more stable and reliable. 

2. Modular Design 

Kstar Modular UPS adopts modular design, and the module capacity is 20KVA / 30KVA / 40KVA / 50kVA optional The UPS system consists of 1 to 20 UPS modules connected in parallel and the number of UPS cab be flexibly increased with load. 

3.N + X Parallel Redundancy 

With N+X parallel redundancy design, users can configure different degrees of redundancy according to the importance of the load. When the number of redundant modules reaches more than two, the availability of the UPS system can reach 99.999%, and the MTBF (average fail-free time) can reach more than 250,000 hours, which can fully meet the high reliability requirements of the power supply system for critical loads. 

The amount of redundancy of UPS can be set through LCD screen. An audible alarm sounds when the load exceeds this limit. 

The product adopts the combination of decentralized control and centralized management. Each module operates independently and managed by a centralized control unit. The centralized control unit is redundant and parallel so that single failure does not affect the operation and it's hot-pluggable 

4. Centralized Bypass Power Supply 

5. Large LCD display (with touchscreen) 

KSTAR UPS adopted 7-inch LCD display，available in Chinese and English. With the screen you can track status on UPS，such as warning information, fault information and operate the LCD very intuitively through the menu. 

6.Flexible battery configuration 

The battery voltage of Kstar modular UPS can be adjusted, and the external battery pack can be selected from 30-50 12V batteries to reduce losses and improve battery utilization. The UPS module working in parallel can share the battery pack, and the number of batteries is not limited by the number of parallel machines, which greatly reduces the number of battery configurations. Users can make the battery configuration completely according to the backup time. 

7.Intelligent Charging System

Advanced three-stage charging method: the first stage of high-current constant current charging, fast recharging of about 90% of the electricity; the second stage of constant voltage charging can activate the battery characteristics and fully charge the battery; the third stage of floating charging mode . Constant current charging mode, constant voltage charging mode and floating charging mode can be automatically and smoothly switched. 

8.Easy to maintain

Kstar modular UPS provides maintenance bypass function, which allows you to switch to maintenance bypass power supply in case of emergency, and maintenance personnel can safely repair online. 

If the number of failed UPS modules is less than or equal to the number of redundant UPS modules, the failed UPS modules can be replaced online without affecting the work of other modules.If the number of faulty UPS modules is less than or equal to the number of redundant UPS modules, you can replace the faulty UPS modules online without affecting the operation of other modules. In this case, the shutdown maintenance time is zero; If the number of faulty UPS modules is greater than the number of redundant UPS modules, the maintenance time will be no more than 5 minutes due to maintenance by replacing the UPS modules.