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PoE Switch Power Consumption: More Electricity Cost?

November 19, 2021

Nowadays, many enterprises choose PoE switch to connect power devices like IP cameras, wifi access points due to the PoE technology can support power and data transmission over the same network cables. However, when it comes to choosing a PoE switch, the limiting factor has always been power. What are the factors that affect power consumption of PoE switch? How can I reduce the power consumption of PoE switch? The above question might be sticking points for you. Keep reading to know more about PoE switch power consumption.

What Are the Factors That Affect Power Consumption of PoE Switch?

PoE Standard

PoE standard is an important factor that will affect power consumption. Because PoE, PoE+, PoE++ are different PoE standards, and they deliver different power to the PDs. It's suggested that you'd better make sure that your PoE switch can support the power that your PDs require.

The following table shows the specifications of different PoE standards. And for more information, please refer to PoE vs PoE+ vs PoE++ Switch: How to Choose.

Name IEEE Standard Power to Powered Device (PD) Max. Power per Port Supported Devices
PoE IEEE 802.3af 12.95 W 15.4 W Static surveillance cameras, VoIP phones, wireless access points
PoE+ IEEE 802.3at 25.5 W 30 W PTZ cameras, video IP phones, alarm systems
PoE++ IEEE 802.3bt (Type 3) 51 W 60 W Video conferencing equipment, multi-radio wireless access points
PoE++ IEEE 802.3bt (Type 4) 71.3 W 100 W Laptops, flat screens

Connected Numbers of PDs

The number of PD connected to the PoE switch is another factor that affects the power consumption of PoE switch. The more PDs you connect to one PoE Ethernet switch, the more power consumption is generated. For example, if 10 PoE IP cameras with its' 7W power consumption are connected to a 24 port PoE switch with 200W power budget, then the 10 PoE IP cameras are going to generate power consumption of about 70W in total; In the same way, 20 PoE IP cameras will generate about 140W in power consumption. Furthermore, in a large data center, the PDs heat up as it runs, which may require other devices such as fans and air conditioners to cool them down, resulting in a certain amount of energy consumption.

PoE Switch Power Budget

The power budget is another factor that affects the power consumption of the PoE switch. Some managed PoE network switches used in large enterprise environments may up to 400W power budget, but for a home network, it's wise to use a basic unmanaged PoE switch with just 60W power budget.

How Can I Reduce the Power Consumption of PoE Switch?

Energy Efficient Ethernet (EEE)

Energy Efficient Ethernet, short for EEE, is a technology defined as IEEE 802.3az to reduce switch power consumption during periods of low network traffic, aiming to reduce power consumption by more than 50 percent while remaining fully compatible with existing devices. It is also sometimes known as Green Ethernet. In addition to the link load power savings of Energy-Efficient Ethernet, Green Ethernet works in one of two ways. To begin with, it detects link status, allowing each port on the switch to power down into a standby state when a connected device is not active. Second, it detects cable length and adjusts the power used for transmission accordingly. Note that you have to make sure that the device port and connecting device must support 802.3az EEE when choosing a PoE switch.

                                                                            Figure: Green Ethernet for Energy Saving

Use Intelligent PoE

Using intelligent PoE is another effective way to reduce the energy consumption of switch so as to deliver better ROI for businesses. Intelligent PoE can automatically detect the power consumption status of each Power Device and supply the power the PDs require. And if the connected device is a non-PoE device, this intelligent PoE switch will not send power, which can protect the not-PoE device. By using intelligent PoE technology to minimize the waste of unused power, enterprises can save a lot of money on electricity cost.

Will PoE Switch Cost More Electricity?

Although the PoE switch is a little more expensive on the surface -- with increased equipment and power costs -- but overall, the increased productivity brought by the PoE switch outweighs the increased power costs. Because PoE network switch simplifies installation and maintenance costs. Users don't need to purchase and install additional electrical wires and outlets. In addition, good PoE switches also enable a simple network management protocol (SNMP), which provides a simpler way to supervise and manage the switch.

As a result, it's shortsighted to pay attention to only the increased power costs when choosing the right PoE switch. Given the advantages of better integration of applications, boosted productivity and free up IT resources, your wise choice of PoE switch will be beneficial to soften the blow of a higher energy bill.

FS PoE Swich: A Good Choice for A Cost-Effective Network

FS introduces various PoE switches, including PoE+, PoE++, unmanaged/fully managed/smart managed/, and 8 port/10 port/24 port/48 port network switches, to meet your different networks. The following are two 8 port PoE Ethernet switches. S2800S-8T2F-P L2+ managed network switch supports IEEE 802.3az, and S1900-8TP is an unmanaged PoE+ switch. Both of them can save power consumption. Choose one to power your IP cameras or APs.

PoE Switch S2800S-8T2F-P S1900-8TP
RJ45 Ports 8 x 10/100/1000BASE-T 8 x 10/100/1000BASE-T
PoE Ports 8 x PoE+ Ports 8 x PoE+
PoE Standard IEEE 802.3af/at IEEE 802.3af/at
PoE Budget 65W 140W
Max. Power Consumption 83W Maximum AC 165.4W (220V/50Hz)
Management Type Smart Managed Unmanaged
Energy Efficient Ethernet
Intelligent PoE
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