1. Power Supply Capacity: The power supply unit (PSU) will have a specified power output capacity, typically measured in watts (W) or amperes (A). This capacity determines the total amount of power it can provide to the connected devices, including the cameras. The higher the capacity of the power supply, the more cameras it can support.
2. Power Consumption of Cameras: Each CCTV camera has its power consumption rating, usually specified in watts or milliamperes (mA). This rating indicates the amount of power required for the camera to operate correctly. To determine the number of cameras a power supply can support, you need to consider the power consumption of each camera and ensure that the total power consumption of all the cameras does not exceed the capacity of the power supply.
3. Power Splitting: In many cases, a power splitter or distribution box is used to distribute power from the power supply to multiple cameras. The power splitter splits the power output from the power supply into multiple outputs, allowing you to connect multiple cameras to a single power supply. The number of cameras that can be connected to a power supply through a power splitter depends on the power supply's capacity and the power consumption of the cameras.
It's important to consult the specifications of the power supply and the power consumption ratings of the cameras to determine the maximum number of cameras that can be supported. Additionally, it's recommended to consider factors such as voltage drop over long cable runs and the need for additional power supplies if the total power consumption exceeds the capacity of a single power supply.