Written 22 Aug 2026. Specs from the maker pages linked below. Prices from those stores. I haven't used these.
One injector, two injectors, or a 4-port PoE+ switch
One AP can use a small injector. Two APs is when a tiny PoE switch starts making sense. Don't buy four injectors.
Cheap PoE for two APs already crowned TL-SG1005P. This post is the injector math. A 15.4 W af injector feeds EAP613 (10.9 W), U7 Lite (~13 W), Instant On AP21/AP22, or GWN7660 (9 W). It does not feed EAP653 (15.5 W, 802.3at). One at-class puck needs a 30 W injector or a switch port that actually does at.
Two af APs fit one 64 W fanless 4-PoE+ switch. Two injectors plus a non-PoE switch is more wall warts and the same money as the switch once you buy the second brick. UniFi’s own 15 W injector is $8 if you already live there.
What to buy
| Box | What it is | Street, 22 Aug 2026 | Buy if |
|---|---|---|---|
| TP-Link TL-POE150S | 802.3af injector, 15.4 W. | Amazon $17.99 (B001PS9E5I). | One af AP. Not EAP653. |
| TP-Link TL-POE160S | 802.3at injector, 30 W. | Amazon $22.99 (B08LZZRX5N). | One at AP (EAP653, EAP670, EAP723, Cudy AP3000). |
| UniFi U-PoE 15W (U-POE-AF) | 48 V / 0.32 A. 15 W. | $8 UI store. | One U7 Lite off a non-PoE switch. |
| TP-Link TL-SG108PE | 8× 1G, 4× PoE+ / 64 W, fanless, smart managed. | Amazon $51.49–$60.85 (B01BW0AD1W). List $69.99. | Two APs now, maybe a camera. No 2.5G. Quiet closet. |
If the APs are 2.5G (U7 Lite, Cudy AP3000, EAP670), the injector still works: the uplink is only as fast as the injector’s gigabit jack. For 2.5G end to end you want 8-port 2.5G PoE. Match class in af / at / bt. Don't feed any of these from a 24 V passive brick.
Skip
Skip a second 150S when the next AP is at-class. Skip SG2210MP for two APs, 150 W and a fan you will hear; fan note. Skip treating two $18 injectors as cheaper than a $52 fanless switch if you already know camera three is coming.
Sources
Amazon TL-POE150S. Amazon TL-POE160S. UI U-PoE-AF. Amazon TL-SG108PE.