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How to Choose the Correct Power Supply for Your CCTV Camera

February 2, 2024



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The importance of a power supply for your video security cameras cannot be overstated. Installers and users should use a high-quality CCTV power supply box to ensure the stability and reliability of their video surveillance system. Image distortion, flickering, and even security camera hardware damage can all be caused by a poor power supply. Outdoor security cameras typically use a 12V DC power source, while PTZ cameras use a 24V AC power supply. Some security cameras may use 220V AC power, and inside security cameras commonly use a 5V DC power supply. You’ll learn how to choose the right power source for your security camera in this post.

Security Camera Power Supply

The most common power supply voltage for security cameras is 12V DC. It isn’t, however, the sole option. Wireless security cameras that are powered by batteries or solar energy are also available.

Inexperienced installers discover that the power capacity is insufficient in real-world installations, necessitating the inclusion of extra power supplies. Because the security camera requires a substantial amount of electricity when it initially turns on, as well as for transmission, calculating the total required power supply does not entail simply adding the rated power of each camera together. The correct way is to multiply the rated power by 1.3 to get the real required power supply for security cameras. You must also account for cable power usage and power budget.

The AC24V power source was chosen since the greater the voltage, the lower the consumption over the same transmission distance. High voltage can provide enough power to the camera. Meanwhile, while debugging security cameras with AC 24V, you can use a sync power supply to sync image vertical frequency across several devices.

power supply
Source: Pinterest

How to calculate Power Outage For a Group of Cameras

For optimal results, consider employing a distribution box if you require additional cameras or 8 or 16 channel CCTV camera systems. A security camera power supply distribution box enables you to elegantly route power cables and connect and control the power wire of each CCTV camera without the use of several power adapters. As a result, power supply distribution boxes or splitters would be a better choice for organizing your cameras.

Assuming we have 16 cameras to place in a DVR and that the source will only be used for the cameras because the recorder has its source, we perform the following calculations:

16 cameras at 0.35A (350mA) each: 

16 x 0.35 = 5,6A

Considering the maximum 80% capacity:

5,6 / 0,80 = 7A

Repeat the method for the remaining cameras, dividing the connectors that haven’t been used yet. Each pair of connectors (V- V+) in the example above would contain eight cameras. In practice, it’s advisable to buy a power supply with a larger number of connectors to make the installation go more smoothly.

Selecting Between AC and DC Power Supplies

Choosing the correct type of power supply, AC (Alternating Current) or DC (Direct Current), is a critical decision in setting up a CCTV system. Each has its unique characteristics and suitability for different camera types.

Differences Between AC and DC Power Supplies

  • AC Power Supplies: AC power is known for its ability to travel longer distances without significant power loss, making it ideal for large installations where cameras are spread out. It’s commonly used in commercial and industrial settings.
  • DC Power Supplies: DC power is typically used for smaller, more localized installations. It’s favored for its simplicity and ease of integration with a wide range of CCTV cameras, especially in residential or small business environments.

Pros and Cons of AC24V and DC12V Power Sources

AC24V Power Sources:


  • Better for long-distance power transmission.
  • It can handle varying power demands, which is beneficial for PTZ cameras.
  • Less likely to experience voltage drop over extended distances.


  • Typically, it is more complex to install.
  • It may require additional components like transformers.

DC12V Power Sources:


  • It is ideal for most standard CCTV cameras, especially in smaller setups.
  • More straightforward installation.
  • Generally more cost-effective and readily available.


  • It is not suitable for long cable runs due to voltage drop.
  • Limited suitability for high-power-demand cameras.

When choosing between AC and DC power supplies, consider the layout of your CCTV system, the distance between cameras and power sources, and the specific power requirements of your cameras. AC24V is often chosen for expansive, complex systems with high-power needs, while DC12V is typically sufficient for smaller, more straightforward installations.

How to Provide Sufficient Power to Security Cameras?

Many cctv camera installers discover that the power capacity is insufficient during actual installation and must add additional power. Because the security camera requires a substantial amount of electricity when it initially turns on, as well as for transmission, calculating the total required power supply does not entail simply adding the rated power of each camera together. CctvThe correct way is to multiply the rated power by 1.3 to get the real required power supply for security cameras. You must also account for cable power usage and power budget.

Consider the following scenario:

If 100 security cameras are installed in a business building, the security camera’s rated power usage is 4W. How do you figure out how much power you’ll need?

Power consumption of security cameras: 4W × 100 units x 1.3 = 520W

The required power rating is after consumption. 520W x 1.3 = 676W 

Cable consumption and power budget 676W x 1.3 = 878W

Power Adapter or Power Boxes

Power supply boxes
Source: Eabel

A power supply is required for all security cameras. In most security camera systems, power boxes and power converters are employed. Most installers will utilize a power adapter and splitter if installing four or fewer cameras, but a power distribution box from a reliable enclosure manufacturer if installing more than four cameras. When purchasing a power adapter, make sure it meets the voltage and amperage requirements for your cameras.

Security camera installers can use a CCTV power supply box, also known as a security power
distribution unit, to concentrate the power source of several cameras to a single location. Wiring becomes neater and easier to manage when used with RG59U siamese cable or video baluns. Instead of having a separate power source for each camera, all of them can be connected to a single power supply box.

The CCTV power supply box is simple to use; simply run your cabling and attach the 2-wire leads from the power part of your Siamese cable to the screw-terminal panel inside the power supply box. After that, connect the power box to a conventional 110V AC power outlet to complete the installation. There’s no reason to keep an outlet close to your cameras. For power distribution boxes, CCTV Camera World offers two output voltages and a wide range of amperage options; please select the one that best fits your cameras.

Battery and Solar Power Supply

Solar powered outdoor Cctv camera
Source: Pinterest

Other options for CCTV camera power include non-rechargeable batteries, rechargeable batteries, and solar energy. This group of CCTV cameras has wireless capabilities. As a result, they’re more adaptable than wired cameras that rely on power adapters.

Battery-operated security cameras save you the trouble of drilling a hole in the wall to install a socket and a tangle of wires. Meanwhile, you don’t have to be concerned about security cameras that aren’t powered or finding custom electrical enclosures. We help protect our property and the environment by using solar energy as a security camera’s power source.

What Should Be Avoided When Setting up Power Supply?

CCTV power supply box
Source: Pinterest

When connecting security cameras to a power supply, don’t connect long-distance connected security cameras to the same power supply as near-distance connected security cameras. If connected to the same power source, a high power supply voltage can harm near-distance security cameras, while a low power supply voltage will cause long-distance security cameras to fail. All near-distance security cameras should be connected to a single power source, while long-distance security cameras should be connected to a separate power supply.

Users may utilize higher voltage power supplies, such as 30V, 36V, 48V, or even 220V AC power supplies if the installation distance of security cameras is too long.

Users should avoid using a single or centralized source of electricity. Because of the following reasons:

To fix a video camera system, turn the power supply on and off. All security cameras begin to boot, requiring a large amount of boot current. This will have a significant influence on the power supply, possibly causing damage.

If all of the security cameras are powered by the same power source. When the power source fails, all of the video security cameras will switch off. Especially for some critical access points that you are unable to monitor.

Tips for Long-Distance and Diverse Camera Installations

  • Use Appropriate Cabling: Use thicker cables or active power/video baluns for long distances to minimize voltage drop.
  • Centralized Power Management: Utilize power distribution units to manage multiple cameras efficiently.
  • Consider Environmental Factors: Ensure your power supply and cabling are suitably protected against the elements in outdoor or harsh environments.
  • Plan for Expansion: Design your power supply system with future expansion in mind to avoid costly overhauls later.


The importance of a power supply guaranteed by electrical enclosure manufacturers for your security cameras cannot be emphasized enough. But look no further, Eabel has got you covered; contact us for high-quality distribution box supplies.

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