KA
Tool

UPS calculator

Pick what has to keep running through a power cut and for how long — see the size and battery capacity you need.

1What are you protecting
2Devices

The wattages are typical values. For an exact figure, take it from the device label or its datasheet.

NVR / DVR recorder ≈ 25 WWithout disks
Hard disk ≈ 8 WIn the recorder or server, each
PoE camera ≈ 8 WPowered from the PoE switch
PoE switch ≈ 15 WThe switch itself, without cameras
Plain switch ≈ 10 WNo PoE
Router / firewall ≈ 12 W
ONT / modem ≈ 8 WYour provider box
Wi-Fi AP ≈ 15 WAccess point
Server (tower) ≈ 250 WSmall office server
Server (rack) ≈ 350 W1U–2U, in a cabinet
NAS ≈ 50 W2–4 bays
Desktop PC ≈ 150 WWithout the monitor
Monitor ≈ 25 W
Checkout terminal ≈ 60 WWith printer and screen
Access controller ≈ 20 WWith locks and readers
Other deviceEnter its power in watts
W×
3How long it has to run
4UPS type

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