High availability of modular UPS system

Power supply and distribution system as an important part of the information system, the basic requirement is that the system must be able to work continuously. In order to achieve the purpose of continuous work, the first is that the system should have high reliability, and secondly the system must be able to quickly repair. If it can not be repaired quickly , you may face second failures leading to the risk of paralysis of the entire system, can not guarantee the load continuous work.
In terms of rapid repair, modular UPS has a natural advantage. First of all, in the repair time, due to the characteristics of quick plug, modular UPS can complete the replacement at the scene, the average repair time in half an hour, compared to the traditional tower UPS for repair time of 24 hours, the repair speed improved significantly. Secondly, in the repair quality, repair the modular uninterruptible power supply through the fault module replacement, while the traditional tower UPS need factory to send professional engineers to the locale to locate the fault and repair the fault circuit board and disassemble, the repair cycle is long, and exist the process of communication and positioning, easily lead to repetitive work, affecting the efficiency of fault handling.
Some users may doubt that the N+1 structure of modular UPS is not as stable as the 1+1 system. Indeed, theoretically, the reliability of the 1+1 system must be the highest in the N+1 systems. But factly it is often not so simple:
First of all, this conclusion ignores the load rate, as 1+1 system, only allows one UPS down; while for the modular UPS system, taking 4+1 as example, the reliability is lower than that of 1+1 system when 100% load, but when 75% load rate, modular system becomes a 3+2, then a 2+3 when 50%, the reliability is much larger than the 1+1 system. In the common application situation, the UPS load rate is about 20~40%, in this case the modular has a very obvious advantage.
Secondly, different from the traditional single UPS, modular UPS can easily achieve the redundancy mode such as N+2, N+3, which only need to add 1-2 modules. But if tower type UPS need to achieve this mode, should not only increase 1 hosts, but also transportation, site installation, machine alignment design and the corresponding distribution, the battery needs to change, resulting in a substantial increase in investment.
In summary, the reliability of UPS modulares in the application is much higher than the traditional tower UPS; coupled with the characteristics of rapid maintenance and expansion of UPS, the availability of modular UPS is much higher than the traditional tower UPS.

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