Critical Power Supplies has pleasure in bringing you this guide on different types of UPS applications.

UPS Applications

N+1 Configuration.

In large business environments where reliability is of great importance, a single huge UPS can also be a single point of failure that can disrupt many other systems. To provide greater reliability, multiple smaller UPS modules and batteries can be integrated together to provide redundant power protection equivalent to one very large UPS. “N+1” means that If the load can be supplied by N modules, the installation will contain N+1 modules. In this way, failure of one module will not impact system operation

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Figure 1. UPS in Parrallel

Multiple redundancy




Outdoor use / Military UPS

When a UPS system is placed outdoors, it should have some specific features that guarantee that it can tolerate weather with a ‘minimal to none’ effect on performance. Factors such as temperature, humidity, rain, and snow among others should be considered by the manufacturer when designing an outdoor UPS system. Operating temperature ranges for outdoor UPS systems could be around −40 °C to +55 °C.


Military UPS designs are further enhanced to withstand the environmental pressures and stresses of continuous use or quick deployment in different environments / climates.

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Figure 2 – Military design of UPS

Internal systems

UPS systems can be designed to be placed inside a computer chassis. There are two types of internal UPS. The first type is a miniaturized regular UPS that is made small enough to fit into a 5.25-inch CD-ROM slot bay of a regular computer chassis. The other type are re-engineered switching power supplies that utilize dual power sources of AC and/or DC as power inputs and have an AC/DC built-hiswitching management control units.