Budget by quantity
| Quantity | Draw | Recommended budget |
|---|---|---|
| 8 | 123 W | 154 W |
| 16 | 246 W | 308 W |
| 32 | 493 W | 616 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 16 IP cameras?
Answer
246 W at the switch (class 3 (802.3af))
16 IP cameras on class 3 (802.3af) (15.4 W per port at the switch) add up to 246 W. Using the 80% rule, pick a switch with a PoE budget of at least 308 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.