The standards, the real per-device draw of every device that publishes one, and how to size a switch so it still works on the coldest night of the year.

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1. The standards

Power over Ethernet is an IEEE standard, not a Ubiquiti feature. The figures below are from the IEEE 802.3 standards themselves — they are not Ubiquiti specs and we mark them as such. Ubiquiti’s marketing names sit alongside them.

IEEE standard	Common name	Ubiquiti’s name	Power at the switch port (PSE)	Power guaranteed at the device (PD)
802.3af	PoE	PoE	15.4W	12.95W
802.3at	PoE+	PoE+	30W	25.5W
802.3bt Type 3	PoE++ / 60W	PoE++	60W	51W
802.3bt Type 4	PoE++ / 90W	PoE+++	90W	71.3W

Why the two power columns differ: the gap is cable loss. The standard assumes up to 100 m of cable and budgets for the heat it throws away. The switch commits the bigger number; the device is only ever promised the smaller one.

What Ubiquiti actually publishes per port

Ubiquiti publishes its own per-port ceilings, and they do not all match each other:

Switch	Published max PoE per port
USW-Pro-24-PoE	PoE 15.4W; PoE+ 30W; PoE++ 64W
USW-Flex-2.5G-8-PoE	PoE 15.4W; PoE+ 32W; PoE++ 64W
USW-Ultra / USW-Ultra-210W	PoE+ 30W — and that is the ceiling
UDB-Switch	PoE+ 30W
UCG-Industrial (a gateway)	PoE+: 30W; PoE+++: 90W

Note the 64W. That is Ubiquiti’s figure, above the 60W of 802.3bt Type 3. And note that the Flex publishes 32W for PoE+ where the Pro 24 publishes 30W — Ubiquiti is not internally consistent here, and we reproduce each page’s own figure rather than reconciling them.

Those five rows are the only per-port figures published anywhere in this catalogue. Every other switch publishes a class (“Up to PoE++”) and no watts. Where we don’t have the number, we say so — including for the 48-port PoE+++ switch, which publishes neither a per-port figure nor a total budget.

The UCG-Industrial’s 90W PoE+++ ports are the highest per-port figure Ubiquiti publishes — and it is a gateway, not a switch.

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2. The rule everyone gets backwards

A switch can have hundreds of watts spare and still be unable to power a single device — because budget is a pool and port class is a gate.

The worked example: a USW-Ultra-210W on its included 210W adapter has 202W of budget. A UA-Hub-Door draws 50W. 50 is comfortably less than 202.

It will not work. The USW-Ultra’s ports are PoE+, max 30W. The door hub is a PoE++ device. The port cannot negotiate the class, so the hub never powers on. The 152W of spare budget is irrelevant — it was never the constraint.

The order of checks, and it is not negotiable:

1. Port class. Can this port deliver this device’s class? PoE+ port + PoE++ device = no, at any budget.
2. Watts. Does the sum of maximum draws fit the budget — for the input source you are actually using?
3. Port count. Are there enough PoE ports? This is very often the real constraint. Chimes, hubs, viewers and readers all eat ports while barely touching the budget.
4. Headroom. Target ≤ 70% loaded. Headroom is the expansion path.

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3. Full per-device draw tables

Every figure is max_power_consumption_w from techspecs.ui.com. These are maximums, not typical draw — what the device pulls with everything on. Budget against them anyway: the whole point of a budget is that it holds on the worst night, which is exactly the night you need the footage.

The spec file holds 122 device rows; 114 publish a max draw figure. The rest publish nothing and appear here as “Not published”.

Cameras — all 30, lightest to heaviest

Max draw	SKU	Name	Power method
4W	UVC-G5-Turret-Ultra	G5 Turret Ultra	PoE
4W	UVC-G5-Flex	G5 Flex	PoE
4.2W	UVC-G5-Dome-Ultra	G5 Dome Ultra	PoE
5W	UVC-G5-Dome	G5 Dome	PoE
7W	UVC-G6-INS	G6 Instant	5V, 2A USB power adapter (Included); PoE to USB-C adapter (Not included)
8W	UVC-Doorbell-Lite	Doorbell Lite	PoE
8.64W	UVC-AI-360	AI 360	PoE
9W	UVC-G6-Mini-Dome	G6 Mini Dome	PoE
9.25W	UVC-G6-Dome	G6 Dome	PoE
9.9W	UVC-G6-Bullet	G6 Bullet	PoE
10W	UVC-AI-Dome	AI Dome	PoE
10W	UVC-G4 Doorbell Pro	G4 Doorbell Pro	16–24V AC, 1.25A Max., 50/60 Hz; USB-C power cable, 5V DC, 2A
11W	UVC-AI-Pro	AI Pro	PoE
12.5W	UVC-G6-Turret	G6 Turret	PoE
13.5W	UVC-G6-Pro-360	G6 Pro 360	PoE+
15W	UVC-G6-Pro-Dome	G6 Pro Dome	PoE+
15W	UVC-G6-Pro-Turret	G6 Pro Turret	PoE+
15W	UVC-G6-Edge-Dome	G6 Edge Dome	PoE+
15W	UVC-G6-180	G6 180	PoE+
15W	UVC-G6-Pro-Bullet	G6 Pro Bullet	PoE+
16W	UVC-G6-Entry	G6 Entry	PoE+
18W	UVC-G6-Pro-Entry	G6 Pro Entry	PoE+
20W	UVC-AI-Turret	AI Turret	PoE+
24.5W	UVC-G6-PTZ	G6 PTZ	PoE+
25W	UVC-G6-Edge-Turret	G6 Edge Turret	PoE+
25W	UVC-G6-Edge-Bullet	G6 Edge Bullet	PoE+
25W	UVC-AI-MS-2	AI Multi Sensor 2	PoE+
25.5W	UVC-AI-LPR	AI LPR	PoE+
34.6W	UVC-AI-MS-4	AI Multi Sensor 4	PoE++
51W	UVC-AI-PTZ	AI PTZ Industrial	PoE++

Access points — all 28

These rows are power, PoE and uplink only. Ubiquiti publishes no radio data, no transmit power, no antenna gain and no per-AP client count in this spec set. Anyone quoting you “this AP handles 200 clients” is quoting a guess. AP density is a site survey, not a table.

And it is not that the data doesn’t exist. Ubiquiti publishes antenna gain, TX power, spatial streams and data rates in full for its bridging devices — see gateways and switches. It just doesn’t publish them for the products you are actually choosing between.

SKU	Name	Max draw	PoE mode	Networking interface
UK-Ultra	Swiss Army Knife	8W	PoE	(1) GbE RJ45 port
U6+	U6+	9W	PoE	(1) GbE RJ45 port
U6-Mesh-Pro	U6 Mesh Pro	9W	PoE	(2) GbE RJ45 ports
U6-Extender-US	U6 Extender	11W	Not published	Not published
U7-Lite	U7 Lite	13W	PoE	(1) 2.5 GbE RJ45 port
U7-IW	U7 In-Wall	13W	PoE	(3) 2.5 GbE RJ45 ports
U7-Mesh	U7 Mesh	13W	PoE	(1) 2.5 GbE RJ45 port
U6-Pro	U6 Pro	13W	PoE	(1) GbE RJ45 port
U6-IW	U6 In-Wall	13W	PoE	(1) Data-in: GbE RJ45 port; (4) Data-out: GbE RJ45 ports
U6-Mesh	U6 Mesh	13W	PoE	(1) GbE RJ45 port
U7-LR	U7 Long-Range	14W	PoE	(1) 2.5 GbE RJ45 port
U6-LR	U6 Long-Range	18.5W	PoE+	(1) GbE RJ45 port
U7-Outdoor	U7 Outdoor	19W	PoE+	(1) 1/2.5 GbE RJ45 port
U7-Pro	U7 Pro	21W	PoE+	(1) 1/2.5 GbE RJ45 port
U7-Pro-Outdoor-US	U7 Pro Outdoor	21W	PoE+	(1) 1/2.5 GbE RJ45 port
U6-Enterprise-IW	U6 Enterprise In-Wall	21W	PoE+	(1) Data in: 1/2.5 GbE RJ45 port; (4) Data out: GbE RJ45 ports
U7-Pro-XG	U7 Pro XG	22W	PoE+	(1) 10 GbE RJ45 port
U7-Pro-XG-Wall	U7 Pro XG Wall	22W	PoE+	(1) 10 GbE RJ45 port
U7-Pro-Wall	U7 Pro Wall	22W	PoE+	(1) 1/2.5 GbE RJ45 port
U6-Enterprise	U6 Enterprise	22W	PoE+	(1) 1/2.5 GbE RJ45 port
U7-Pro-Max	U7 Pro Max	25W	PoE+	(1) 1/2.5 GbE RJ45 port
U7-Pro-XGS	U7 Pro XGS	29W	PoE++	(1) 10 GbE RJ45 port
UWB-XG	WiFi BaseStation XG	31W	PoE++	(1) GbE RJ45 port; (1) 1/10 GbE ICM Ethernet port
E7	E7	43W	PoE++	(1) 10 GbE RJ45 port; (1) 1 GbE RJ45 port
E7-Campus-US	E7 Campus	44W	PoE++	(1) 10 GbE RJ45 port; (1) GbE RJ45 port
E7-Campus-Indoor	E7 Campus Indoor	44W	PoE++	(1) 10 GbE RJ45 port; (1) GbE RJ45 port
E7-Audience-US	E7 Audience	51W	PoE++	(1) 10 GbE RJ45 port; (1) GbE RJ45 port
E7-Audience-Indoor	E7 Audience Indoor	51W	PoE++	(1) 10 GbE RJ45 port; (1) GbE RJ45 port

UniFi Access — doors, readers, intercoms

Max draw	SKU	Name	Power method / PoE mode
5W	UA-G3	G3 Reader	PoE
5W	UA-G3-Fingerprint	G3 Reader Fingerprint	PoE
5W	UA-G3-Flex	Reader Flex	PoE
5W	UA-Intercom-Viewer	Intercom Viewer	PoE
6W	UA-G3-Pro	G3 Reader Pro	PoE
6W	UA-Reader Lite	Reader Lite	PoE
13W	UA-Intercom	Intercom	PoE
18W	UA-Ultra	Access Ultra	PoE+
50W	UA-Hub-Door	Door Hub	PoE++
50W	UA-Hub-Door-Mini	Door Hub Mini	PoE++
50W	UA-Retrofit-Hub-2	Retrofit Hub	12/24V DC
60W	UA-Hub-Gate	Gate Hub	PoE++
240W	EAH-8	Enterprise Access Hub	Universal input, 100–240V AC, Max. 4.4A, 50/60 Hz; 32–48V DC Lead Acid Battery, Max. 7.5A @32V

Sensors, chimes and accessories

Max draw	SKU	Name	Power method / PoE mode
0.0226W	USL-Motion	Motion Sensor	Lithium battery CR123A
0.0277W	USL-Entry	Entry Sensor	Lithium battery CR123A
3W	UACC-Chime-PoE	PoE Smart Chime	PoE
3.7W	UP-Chime	WiFi Smart Chime	AC
5W	UP-Siren-PoE	Siren PoE	PoE

Bridging, 5G and connectivity

Max draw	SKU	Name	Power method / PoE mode
2.3W	UDB-IoT	Device Bridge IoT	USB Type-C (5V DC, 1A); 4-pin DC (9–30V DC)
5W	UTR	UniFi Travel Router	USB-C
9W	UDB-Pro	Device Bridge Pro	PoE; PoE+ (Required for PoE output)
14.5W	U5G-Max	UniFi 5G Max	PoE
14.5W	U5G-Max-Outdoor	UniFi 5G Max Outdoor	PoE
18W	U-AirWire	AirWire	USB-C
25W	UDB-Switch	Device Bridge Switch	DC jack (54V DC/1.1A)

Two of these are PoE loads you might not think to budget for: the UDB-Pro bridge at 9W (and it needs PoE+ input if you want to use its passive PoE output), and the U5G-Max / U5G-Max-Outdoor modems at 14.5W each on PoE input. The U5G publishes no max draw at all — it is a PoE device with no published wattage, which is a genuine gap and we will not fill it.

The battery devices — Entry Sensor at 0.0277W and Motion Sensor at 0.0226W — are published in watts on a CR123A lithium cell. They are on no PoE budget. They are in this table because Ubiquiti published the figure and the whole point of this page is that we don’t drop rows.

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4. Worked budget calculations

Example A — an eight-camera commercial job with two controlled doors

Qty	Device	Each	Class	Subtotal
2	G6 Pro 360	13.5W	PoE+	27.0W
2	G6 180	15W	PoE+	30.0W
4	G6 Turret	12.5W	PoE	50.0W
2	U7 Pro	21W	PoE+	42.0W
2	UA-Hub-Door	50W	PoE++	100.0W
2	UA-G3-Flex reader	5W	PoE	10.0W
2	Intercom Viewer	5W	PoE	10.0W
2	PoE Smart Chime	3W	PoE	6.0W
	Total worst-case draw			275W
	PoE ports needed			18

Now size it:

Candidate	Budget	Verdict
USW-Pro-48-PoE	600W	Fits. 275W = 46% loaded. 48 ports leaves room for workstation drops.
USW-Pro-24-PoE	400W	Fits on power (69%), and has the 8 × PoE++ ports the door hubs need. Port count is the constraint here, not watts.
USW-Pro-Max-16-PoE	180W	Fails. 275W > 180W.
USW-Ultra-210W	202W with adapter	Fails twice. Over budget, and its PoE+ ports max at 30W — it cannot power a 50W PoE++ door hub at all.

What this example demonstrates: the door hubs are 36% of the total load on two ports, and they are the reason three of the four candidates are wrong. Cameras were never the problem.

Example B — a four-camera house, and why the cheap switch is genuinely fine

Qty	Device	Each	Class	Subtotal
4	G6 Turret	12.5W	PoE	50.0W
1	Doorbell Lite	8W	PoE	8.0W
2	U7 Pro	21W	PoE+	42.0W
	Total worst-case draw			100W
	PoE ports needed			7

Candidate	Budget	Verdict
USW-Ultra-210W (on its included 210W adapter)	202W	Fits. 100W = 50% loaded. All devices are PoE or PoE+; nothing needs PoE++. Exactly 7 PoE ports — zero spare.
USW-Ultra (adapter excluded, PoE++ input)	42W	Fails. 100W > 42W. Same switch, different box contents.
USW-Ultra (adapter excluded, PoE+ input)	16W	Fails badly. 16W will not run two G6 Turrets.

Example C — one camera that changes everything

Add a single AI Multi Sensor 4 (34.6W, PoE++) to Example B.

• New total: 134.6W. Still under 202W. The budget is fine.
• The USW-Ultra-210W still fails, because its ports are PoE+ and the MS-4 is PoE++.
• The fix is not a bigger budget. It is a different switch class. USW-Pro-24-PoE (8 × PoE++ ports) or USW-Flex-2.5G-8-PoE with an adapter.

One PoE++ device re-opens the entire switch decision. This is why port class is check number one.

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5. Standing rules

1. Check port class before budget. A PoE+ switch cannot power a PoE++ device no matter how much headroom it has.
2. Then check watts — summed from maximums, against the budget for the input source you are actually using.
3. Then check port count. It is very often the real constraint.
4. Target ≤ 70% loaded.
5. A budget without an input source is not a number. USW-Ultra, USW-Ultra-210W, USW-Flex-2.5G-8-PoE.
6. Never invent a PoE figure. Not published by Ubiquiti means not published by us.
7. On someone else’s switch, you have no budget — you have a question.

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Related

• Switches and PoE — the simple version
• Gateways and switches: full tables — the conditional budgets in full
• Cameras: the full spec matrix — every camera’s draw in context
• Power and thermal — the other half of the power story
• Glossary — PSE, PD, 802.3bt, defined once

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Device draws from techspecs.ui.com, captured 2026-07-16. IEEE figures from the 802.3 standards and labelled as such. AVNFi, Calgary.