EL
BG
DE
ES
FR
ITGlossary · UPS technology
Scalability
The ability of a UPS system to expand capacity by adding additional modules or batteries.
Technical level:Intermediate
The needs of a server room or a business change over the years. A scalable UPS lets you increase power or runtime without replacing it: power grows by adding power modules in modular systems or by connecting units in parallel, while runtime grows by adding external battery modules.
Scalability lowers the initial cost, since you buy only what you need today, and protects your investment. It is often combined with N+1 redundancy in the same frame.
A practical tip: before choosing, check the frame's maximum expansion limit, whether modules can be added while running (hot-swap), and whether the electrical installation and breakers are sized for the final capacity, not just the initial one.
Related terms
- Capacity SystemParallel UPS units that share the load with no spare unit (N configuration), so the failure of one unit overloads the rest.
- Modular UPSA UPS design where independent modules can be combined to meet power and redundancy needs.
- AutonomyThe time a battery-powered system (like a UPS) can continue operating critical loads after a power failure.
- Auto RestartA UPS feature that automatically restarts the system after utility power returns following a shutdown.
- Cold Start FunctionA feature that allows a UPS to be started directly from the battery without utility power.
- Cooling FanA built-in fan in UPS or batteries used to dissipate heat during operation.