Storing Rack-Mount UPS’s and Batteries in Edge-Series Cabinets

For small offices, the total power capacity will typically range between 1 to 5kVA with the leading power consumption devices driven by the server and network switch (PoE+).  A back-up UPS and battery can be installed to ensure continuous operation of critical IT equipment and devices such as security camera’s, VoIP phones, email & internet connection.  As the size and weight of the UPS is a driving factor in the cabinet selection, the following factors need to be considered in managing the rackmount UPS:

• Total weight of the UPS and IT system – The UPS can be the heaviest item in the cabinet and is the key driver for the load capacity rating. Wall mount cabinet ratings are typically rated from 90 – 110kg, while industry practice is to de-rate the cabinet load rating by 50%.
• Total depth of the UPS and power cabling – The max depth of the UPS can vary by brand and UPS capacity. Extra cabinet space is needed to support rail positions, power cable size and bend radius.
• Total RMU and depth of the application – Most edge-computing applications require a UPS stored with IT equipment in a small cabinet where RMU availability is critical. 0U mounting of small devices can provide higher densities so the available RMU is maximized.
• Ease of access to the back of the UPS – Throughout the lifespan of the UPS, routing maintenance and servicing of the battery is recommended which requires full access to the front and rear of the UPS.

Table 1 shows a comparison of the leading UPS brands.  Notice that the weight of the battery module is significantly heavier than the UPS and is a major consideration in determining the final specification of the cabinet.

Table 1.  Physical Parameters for Leading Rackmount UPS Brands 

The Revi-Ring™ Vertical D-Ring Managers can be field-reversed to allow the greatest equipment depth in the smallest form factor.  Table 2 depicts the cable management techniques and max equipment depth.

Table 2.  Edge-Series cabinet max depth, RMU and load rating by cabinet type

ABOUT THE AUTHOR

Daniel S. James II, MSEE, MBA

Daniel is the founder of ArcTiv Technologies and currently is resides in Taipei, Taiwan and St. Louis, MO, USA.  He brings over 15 years of experience in both the data center and industrial automation industries having worked for Fortune 500 technology companies in various roles including Corporate Strategic Planning, Product Management and Business Development.  Connect with him on Linked-In.