Engineering notes
Rack UPS in a plant room
Size rack UPS from real load and required minutes, not the no-load price-list watt. PDU, bypass, BMS contacts.
Minutes follow the real load
A 3 kVA nameplate is not 3 kW of servers. Add the measured or nameplate watts, apply power factor, then pick minutes the shift actually needs. Batteries, bypass and a dry contact into the BMS belong on the schedule.