Measure the protected load
Use watts where possible and include servers, storage, switches, firewalls, monitors and any startup peaks.
Power guide
How to Size a UPS for Servers, Networks and Office Equipment
UPS sizing requires actual load, power factor, runtime, voltage, redundancy and future growth.
Choose the required runtime
Short runtime may support safe shutdown, while longer runtime requires additional battery capacity.
Confirm voltage and connections
Input/output voltage, plug type, phase, outlets, rack or tower format and bypass requirements must match the site.
Plan maintenance and growth
Batteries, service access, monitoring, redundancy and future equipment should be considered.
Frequently asked questions
Is VA the same as watts?
No. Both ratings matter, and the supported watt load must be checked.
Can a UPS be expanded later?
Some systems support external battery packs or parallel operation, while others do not.