How To Power Supply Cameras (And 3 Best PoE Injectors)

Wired cameras are superior to wireless in many ways but not for the ease of installation. PoE (Power over Ethernet) technology makes it simpler by putting network connection and power supply in one cable. This means fewer cords and easier installation. We tested the devices that you can use to inject electricity into Ethernet cable to give you the recommendation on the best PoE Injectors, best PoE switches and Best PoE NVRs on the market.

This article aims to help you choose the best PoE injector. For a well-informed decision, we will provide a brief theory on basics of PoE technology and five factors that you need to consider when choosing PoE power supply. We tested dozens of products and selected three that we can recommend. The best PoE Injector is TL-PoE150S ($15) for the outstanding value and simplicity. NETGEAR GS305P ($50) is our choice for the best PoE switch and not only a has a great price but also combines reliability and robustness. When using PoE only to power cameras, you should look into Amcrest NV2108E ($160). Based on our review it is the best PoE NVR around with good NVR functionality and quality power supply at a reasonable price.

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What is PoE?

PoE (Power over Ethernet) is a technology for ethernet wired networks (LANs) that allows the electrical supply to be carried by the same data cables opposed to using separate ones. This significantly simplifies the cabling (only need one cable) and installation processes (simple plug and play).

The illustration below shows how PoE works, but in principle, any camera requires two things to function:

  • Network – connection through which the camera sends the video and audio feeds to your phone, NVR or smart hub. You can use wifi to connect wirelessly or Ethernet cable for wired connection
  • Power – can be delivered to a camera through a wire and depending on the model you need 12 or 24 Volts current

PoE power supply devices work by injecting the electricity into Ethernet cables. This can be done by doing midspan (above) or at a switch point (below)

A number of devices can be powered through PoE including VoIP phones, IP cameras, and Wireless Access Points. Recent development in PoE technology also extends its use to LCD displays, Thin clients, LED lighting, Video conference equipment and even TVs and laptops.

The benefits of PoE are not only in the simplified cabling, fast deployment, and repositioning but also in the additional functionality like remote power control

There three main types of PoE power supplies you can use:

  • PoE injector is a small device that uses existing Ethernet cabling and injects power into it. The injector is used between a camera and a router
  • PoE switch is a network switch that can power 4 and more PoE devices. It is connected to your router to integrate PoE devices into your network
  • PoE-enabled NRV is a network recording device that would also have 4 or more ports to power the PoE cameras. NVRs would normally have simpler PoE functionality comparing to the above

What type of PoE power supply to choose?

  • For a single or two cameras, PoE injectors are the best option. They would be cheaper compared to a PoE switch. An additional advantage of using injector is additional resilience in maintenance as in you will have downtime only for one camera case of a power outage
  • If PoE is only needed to power cameras and you need NVR for video storage, an NVR with PoE ports will be most practical and affordable solution.
  • For everything else, especially if you require to advance PoE functionality (see the factors below), PoE switch would work the best for you

5 Factors When Buying PoE Power Injectors

Five simple factors below will help you to choose the best PoE injector, PoE switch or PoE NVR for your needs

  1. Number of cameras: PoE injectors can usually power up to two devices while PoE switches and PoE NVRs can power up to 32 devices. We recommend to plan for additional capacity and buy at least couple of more ports in case you will decide to expand your setup. For than two cameras it becomes cost inefficient to use PoE injectors with PoE switch or PoE enabled NVR being a better choice.
  2. PoE for other devices: A number other devices can be powered by PoE such as wireless access points and VoIP phones, but if you are only planning to use it for cameras PoE NVR might be a more suitable option for you. This is a more cost-efficient solution (as you will not need to buy both NVR and PoE switch) but will make the cameras dependent on NVR for both recording and power supply.
  3. Power supply – PoE vs PoE+: There are two main PoE standards – PoE and PoE+. They are also called 802.3af and 802.3at respectively. The main difference is the maximum watts the device could provide with PoE+ power suppliers capable of twice more watts compared to conventional PoE. The majority of bullet and dome cameras consume as little as 3 or 4 watts (like our favorite bullet camera Amcrest HDSeries IPM-743E – $40). You will usually only require PoE+ with PTZ (pan-tilt-zoom) cameras. As an example, our recommended PTZ camera (Reolink RLC-423 – $249) could draw up to 20 Watt as it requires extra power to move the camera around. Note that Type 3 and Type 4 PoE standards are also being developed and will be capable of 60W and 90W output.
  4. Power supply voltage (12V vs 24V): Security PoE cameras use 12 or 24 Volts and getting the power right avoids overloads or operating issues (signal loss or outages). For example, if a 12V camera is powered by a 24V power source the camera is likely to be burnt out. You should always check the specification of your power supply (injector, switch or NVR) to match the ones in your cameras. It might be a good idea to check if your power supply has the functionality to automatically adjust the voltage to the consumer (which becomes a standard nowadays)
  5. Gigabit or not: Gigabit port became a marketing vehicle for some PoE devices, but is it really important? Gigabit connection usually refers to the connection of your PoE injector / switch / NVR to the router. The differentiating point is that Gigabit networks have much higher bandwidths comparing to 100MB switches. The former is capable of 8.192MBps bandwidth is at the very top, while Gigabit networks are capable of 125MBps. Having a Gigabit connection between your router to NRV or PoE switch is a nice functionality for future-proofing. NVRs for up to 4-8 cameras, on the other hand, unlikely ever to reach the 100MB network thresholds. As the example, if you ever decided to watch simultaneously the feed from 8 1080p cameras at 3 FPS you will require a bandwidth of 6.5 MBps. On the other hand, Gigabit uplink is almost a mandatory feature as you require significant bandwidth when connecting to your NVR through the switch for constant recording.

Best PoE Injector: TP-Link TL-PoE150S

Selecting PoE injectors is a relatively simple business. There are three main factors you should look at: the price, speed, and a number of ports.

Our universal recommendation for the best PoE injector is TL-PoE150S by TP-Link. If you need to power a normal PoE bullet or dome camera (i.e. non-PTZ no PoE+ cameras) it has the best balance of price and quality. The device is extremely easy to use and has two 10/100/1000Mb Ethernet ports. Some users reported that the power adapter is quite big, but we do not think it would be a major issue.

  • If you only want a maximum of 100Mb Ethernet bandwidth, you can spend twice less and get Y-Axis Wall Plug PoE ($8). It has a single port but would be sufficient the majority of PoE cameras.
  • For the PoE+ cameras, we recommend TRENDnet TPE-115GI ($28), which has a single PoE+/PoE port and works with both 802.3 at and 802.3af protocols. It also has a relatively high operating temperature so it would work great for installations in attics or other areas with high average temperatures.

Best PoE Switch: NETGEAR (GS305P)

Our overall top PoE power supply only pick is NETGEAR (GS305P). It is slightly more expensive comparing to BV-Tech POE-SW501 ($34) but based our test offers better reliability and we are liking the sturdiness and robustness of the device. All of the ports are gigabit which is also a plus. Another thing that distinguishes it from the competition is lower latency. This allows your networks to have better overall performance and is important for security cameras. A metal exterior also works better compared to plastic for overall robustness.

Reasons to buy

  • Fanless and works fast
  • Metal chassis (not plastic)
  • Works without long set-up process

Be mindful of

  • No real cons unless you are bothered by multiple blinky LED lights.

Vs competition

  • 8 Port PoE – you should look into BV-Tech 8 port switch ($64) which is a very strong and reliable switch, but it only offers 10/100M ports.
  • Gigabit ports – the best option would be NETGEAR (GS108PP) ($124) although it is more expensive

If you are looking into PoE+ devices, we recommend the following options:

  • 4 port PoE+ ports – BV-Tech POE-SW501G ($47) which is has a nice aluminum housing and doesn’t feel cheap like some other switches we have seen. The switch will automatically figure out what PoE power the device needs. The only negative that has been reported is that the power connectors are on the opposite sides of the box and more room is needed to install. Also, the Ethernet jacks do not have link status lights, but there is a separate LED panel which sometimes more difficult to read.
  • For a slightly more expensive price, you can get even more bandwidth. TRENDnet TPE-TG50g($64) has four 10 Gigabit ports to future-proof your network connection needs.
  • If you have more than 4 PoE+ cameras or devices to connect, you should consider BV-Tech 8 Port Gigabit PoE+ POE-SW800G($79) or slightly less expensive Amcrest AGPS9E8P-AT-96($78) with up to 100M ports. Both been commented on delivering great value for money with reliable services and autodetection functionality.
  • If you need more than 8 devices, we recommend BV-Tech 18 Port PoE+ Switch (16 PoE+ Ports | 2 Gigabit uplink) ($110) it is a strong unmanaged switch working well for devices required only 100MB ports
  • Managed PoE switches give you more controls over each port. This is not necessarily needed for the home setups and also considerably more expensive. NETGEAR 16-Port Gigabit PoE/PD Managed Switch (GS516TP-100NAS) is a good choice for 16 port setups with the excellent user and professional feedback on reliability and build quality.

When PoE NVR is a good option?

PoE NVRs can power your cameras and at the same time record the feed from them. It is usually a good option if you are not using any other PoE devices like access points or VoIP phones. The main disadvantage of having a combined device is less resilience in your setup. A single device for recording, connecting and powering devices means any outages has greater impact as you lose all of those three functions.

If you want to learn more about NVRs, have a look at our comprehensive guide on What is NVR and Best Network Video Recorders 

Best PoE NVR: Amcrest NV2108E

Amcrest NV2108E is the best PoE NVR in the market. It is a solid 8-Channel POE NVR that supports up to 6-Megapixel and up to 6TB HDD storage. It comes with the standards functions and provides easy setup and access applications.

Reasons to buy

  • Great value for money – affordable NVR with good functionality
  • Connects well with other brands
  • Very high tech and high quality
  • Live 2-way audio works well
  • Good post-sales support

Be mindful of

  • Some descriptions in Amcrest website and manuals are inconsistent and confusing
  • The user manual is generic and not model specific

Installation and use 

To get started you need to install HDD (standard 3.5″ drive). We recommend WD Purple 4TB ($117) disk but any 3.5″ SATA drive should work. Next, connect your PoE camera into one of the ports.

Plug NVR into your router using ethernet and connect a monitor using RGB / HDMI and a mouse. Plug the NVR into the power plug and follow the relatively simple onscreen instructions to start watching/recording your security videos

Be mindful of the storage drives (HDDs) that you will need to install and calculate the capacity you would need. Very crude calculations put a recording rate to about 500 MB / Hour / Megapixel. So, the 4MP camera would require approximately 2 GB of data per hour on a constant recording mode.

Alternative Pick for PoE NVR: Reolink RLN8-410 

Reolink RLN8-410 is a bit more expensive version and you will get considerably more polished mobile and android applications. It also has pre-installed 2TB hard drive.

Reasons to buy

  • Great quality desktop app
  • Good Android app
  • Can be used at any port you like (not only port 80)
  • Reliable motion detection

Be mindful of

  • Noisy Fan, which might be an issue for quite rooms. You can replace it with the alternative fan (like Noctua NF-A4x10 FLX) under 3 minutes
  • Browser Streaming only in IE

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