PoE Switch or Power Supplies for Cameras: What Works Better

Option one: a classic 12V power supply next to each camera plus a separate power cable. Option two: PoE (Power over Ethernet, 802.3af/at) — power and data travel over one twisted pair from a PoE switch, up to 100 meters with no extra wiring or outlets.

For one or two cameras, power supplies are cheaper. But from 3–4 cameras the economics flips: every supply needs an outlet next to its camera (that means electrical work), every supply is a separate point of failure, and backing them up individually against blackouts is nearly impossible.

PoE solves all of that with one node: the switch sits in a cabinet with a single UPS — and the whole CCTV system survives a power cut. Diagnostics get easier too: a frozen camera can be rebooted remotely by cycling PoE on its port instead of driving to the site.

With supplies: 8 PSUs, 8 outlets (installation!), a basic switch, and almost nowhere to fit a UPS. With PoE: one 8+ port PoE switch, one UPS in the cabinet, zero extra outlets. Upfront cost is similar; total cost of ownership favors PoE: fewer failure points, backup in one place, remote management.

The one thing to calculate in advance is the PoE power budget: the sum of all cameras' consumption (regular — 5–7 W, PTZ and heated — 15–25 W) must fit the switch's budget with 20–30% headroom.

The main mistake is counting ports instead of watts: an '8-port PoE' switch with a 65 W budget will not carry eight cameras with IR and heaters at 12–15 W each. Always sum the maximum draw of every camera and keep 20–30% headroom — in winter illumination and heating run at the same time.

The second mistake is passive PoE instead of the standard: cheap 'PoE injectors' push voltage without negotiation and can burn the port of a camera built for 802.3af/at. The third is length: beyond 100 meters of copper you need a PoE extender or fiber with a media converter, not wishful thinking.

Up to 2–3 cameras with outlets already in place — power supplies are acceptable. From 3–4 cameras, and in any system that must survive blackouts, — PoE, no question. We will help you pick a PoE switch for your camera count and calculate the power budget — message us in chat or Telegram.