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The Benefits of UPS System Scaleability
Modular UPS systems are scaleable, making them 'future proof'. Anticipating growth of the critical load can be difficult. Purchasing a modular UPS system, for example the PowerWAVE9000DPA™ Series, offers true flexibility. It is supplied with a free-standing cabinet that accommodates up to five rack-mountable UPS modules. Initially, if the load is less than the power rating of one UPS module, the cabinet could be populated by two UPS modules to provide '1+1' parallel-redundancy.
Later, if the size of the critical load were to require it, the cabinet could be populated by up to five modules. If five modules were installed and the critical load were to demand, for example between 60% and 80% of the total capacity of the UPS system, the system would be described as operating '4+1' parallel-redundant mode. (Note: If the critical load were to demand between 80% and 100% of the total capacity of the UPS system, the system would be described as operating 5+0). Populating slots with UPS modules in single cabinets is commonly referred to as 'vertical scalability'.
If the size of the critical load were to increase beyond the capacity of a single cabinet, additional cabinet(s) that are partially (or fully) populated by UPS modules, could be connected in parallel to the first cabinet. Increasing the capacity of a UPS system in this way is commonly referred to as 'horizontal scalability'. 'Right-sizing' of a UPS system in this way has a beneficial effect on its total cost of ownership.
UPS System Redundancy
The above diagram shows how often UPS systems are loaded according to the expected capacity that will be needed in years to come. Often the actual load is less than anticipated meaning that much of the capacity of the UPS system is wasted. This is called 'over-sizing'.
With modern UPS solutions such as the PowerWAVE9000DPA™, which uses de-centralised parallel architecture, it is possible to simply add UPS modules in cost effective incremental steps as the critical load power requirement grows. Therefore it is not necessary to oversize the UPS at the time of initial installation. This 'right-sizing' reduces the system's initial cost, optimises its operating efficiency an helps reduce the total cost of ownership.
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