Define which equipment truly cannot switch off
A business may need a router and point-of-sale system running for a short outage but not a full kitchen, printing room or air conditioning system. We start with the list of essential devices, their electrical ratings and how long they must operate during an interruption. Servers and networking equipment may also have manufacturer shutdown and restart requirements. This prevents an expensive unit being specified for loads that should stay on normal supply, and avoids false confidence from a nameplate capacity that ignores run time.

