Budget by quantity
| Quantity | Draw | Recommended budget |
|---|---|---|
| 12 | 185 W | 231 W |
| 24 | 370 W | 462 W |
| 48 | 739 W | 924 W |
Values are the class maximum on the switch side (PSE). Real draw is usually lower, but the switch reserves the class power.
How many PoE watts do I need for 24 IP cameras?
Answer
370 W at the switch (class 3 (802.3af))
24 IP cameras on class 3 (802.3af) (15.4 W per port at the switch) add up to 370 W. Using the 80% rule, pick a switch with a PoE budget of at least 462 W.
More questions like this
Frequently asked questions
Do cameras really draw that much?
Not always: a typical dome camera draws 4–8 W, but IR and heaters push it up. Size by class so you don't fall short.
How far does PoE reach?
Up to 100 m of twisted pair (Cat5e or better). Beyond that, use a PoE extender or fiber.