RelayPoint Technologies · Norfolk County, Ontario
PoE Budget Calculator
Add up what your cameras, access points, door readers and phones actually draw, then see which UniFi switch has the power to run them. Built by the people who get called out when the cameras start rebooting at 2 a.m.
1 · What are you powering?
Example load2 · How much room to leave
Headroom for the devices you will add later, and for cold nights when infrared and heaters all pull at once.
Recorder, desktops, printer, TV, anything that needs a port but brings its own power. One uplink port is added for you.
Only some UniFi switches accept a second power supply. Choose this if the cameras or door hardware cannot go down.
How the maths works
A switch has to put more power into the cable than the device takes out of it. The gap is heat lost in the copper, and the standards build it in: a switch reserves 15.4 W at the port to deliver 12.95 W of 802.3af, and 30 W to deliver 25.5 W of PoE+.
So this tool adds up the maximum draw Ubiquiti publishes for each device, adds about 18% for that cable loss, then adds your spare capacity on top. The result is the switch budget you should be shopping for, not the number on the back of the cameras.
Class-reserved figure: some switches hold back a full port class for every device that asks for one, whatever it actually uses. Where that matters we show it, and it is the safer number for a fixed-allocation setup.
What this cannot see
- Cable length and quality. A 90 m run of thin unshielded cable loses more than the standards assume.
- Voltage drop on outdoor runs in a Norfolk County January, which is when camera heaters draw hardest.
- In-wall access points and door hubs that pass power through to something else. Add those downstream devices to the list too.
- Whether the switch can breathe. A switch delivering 300 W in a sealed cupboard in July will throttle or fail early.
Power needed
0 devices- PoE ports
- 0
- Total ports
- 0
- Highest class
- —
Switches that fit
UniFi, in stock in CanadaGet it quoted
Every job is quoted in writing before any work starts. Send us this build and we will confirm the switch, the cable runs and the labour for your site.
The switch we point to has the PoE budget to run your devices with headroom to grow. We quote the hardware in writing at the current Canadian price when you order, since that moves with Ubiquiti's own pricing and stock. Installation, mounting, cable runs and configuration are quoted separately: technician labour is $150 an hour. Every job is quoted in writing before work starts. Device wattages are the maximum figures Ubiquiti publishes on techspecs.ui.com; switch PoE budgets come from the same place. Standards figures follow IEEE 802.3af/at/bt as summarised by Ubiquiti's own PoE guide. This is a planning tool, not a design. We check the real numbers on site.