Need a formula to check total number of milliamperage is within tolerance range of camera power supply unit.?

I have 3 types of cameras all to be wired to a 16 camera by 8 Amp standalone power supply. 7 of the 16 are Infared Cams. I dont want the supply to dropout when all the IR emitters come on. Is there a math formula to add up the milliamps?

Answer:
The most important thing to consider is the power consumption of the cameras. If you have a 12 volt camera that consumes 10 watts with the IR emitter enabled:

Current = 10watts / 12Volts = 0.83 miliamps

0.83mA * (16 cameras) = 13.33 amps (power supply is not enough!)

This last value is just an example, assuming that all the cameras work on 12V, 10W, and are consuming maximum power. These are typical specifications of a camera with IR leds. You should check your specific camera specs for info on power consumption.
Just add. Every thousand milliamps is one amp.

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