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Updated
When it comes to providing power backup to heavy volume servers (600-1000W power margin,) this UPS offers unbeaten price efficiency. You can even expand its battery capacity by attaching external batteries to the unit. This unit is available in 2U rack and tower form factors.
SpecsUpdate
Pros
Pro Substantially expandable battery life
The default three minute battery life of this UPS (at full load) can be extended using external battery modules. A single battery module can triple the unit’s battery life from three to nine minutes on-battery lifetime at full load. Up to 10 of these modules can be attached for a total of 63 minutes at full load. The modules can also be installed even while the system is running.
Pro Has a removable LCD control panel
You can use the LCD control panel to control and view the UPS’s settings. The fact that it’s removable is quite helpful, since UPSs are often installed in inconvenient places such as crowded IT closets, at the bottom of a rack or even on the floor. The LCD panel can be placed up to 10 feet away from the UPS itself, though you’ll need a DB26 cable (not included) to connect it.
Pro Can be placed outside the network rack
This unit comes with the tabs and screws necessary for mounting it on a U rack or a tower stand. This means you can opt to save precious space in a server enclosure by placing the UPS somewhere outside the network rack. Since the UPS has a large form factor (2U rack), this can be helpful.
Cons
Con External batteries are large and expensive
A single external battery module costs $413.88 and has a 2U rack form factor. Doubling the on-battery lifespan of a single unit would cost about ⅔ of the price of the UPS. Also, space in a server rack is usually very limited, therefore, expensive. The external battery module would also take up 2U rack height, same as the UPS itself.