Rackmount UPS vs. Standalone Central UPS Unit

Uninterruptible Power Supply (UPS) is an essential component of any electronics and data-driven device or system. Be it in the comfort of your bedroom, or working in a large corporation, you can see an Eaton UPS present in every device or room. Rackmount UPS’s are a common sight at data centers, but you can find Standalone Central UPS units on almost all major private or government corporations and institutions.  Which has a more practical advantage?


Rackmount UPS

These are decentralized or distributed UPS. Servers and networking applications commonly use them. Each unit can be mounted safely on a standard 19” rack. They are installed together with the hardware.


Standalone Central UPS

It is a centralized standby set-up consisting of one or two large UPS’s. You can find it alongside the perimeter of the server room, or in a separate site within the vicinity.


Advantages :

The initial cost of investment for Rackmount UPS is considerably low. You do not need an electrician to install it, and it’s easier to operate. You can do the maintenance of your facility. It is lightweight and portable. These are great for small companies or organizations.

They designed the Standalone Central UPS for high availability environments. It means it is effortlessly scalable from more than 10 kW. It has a longer battery life, which goes from 5-6 years. It has higher efficiency and can maximize three power phases. The batteries are hot-swappable. These are great for large companies with critical-missions operations.



Rackmount UPS’s are not for mission-critical equipment. It takes up valuable rack space. It has limited back-up time and limited battery life, ranging from two (2) to three (3) years only. It is not as effective as 3-phase UPS. Batteries may not be hot-swappable. It is also very difficult to manage the system because of the inefficiency of the design.

Standalone Central UPS has a higher upfront investment. It requires a contractor to guarantee apt installation. It also needs a large area for the standalone unit. Scheduled maintenance is also essential and mandatory. Its biggest drawback is its energy inefficiency.