Monitoring centralized power supply problems
I do the monitoring system of 26 monitoring points I used the power of two 12V8.5A with easy, do not affect the results, generally every 100 meters of line voltage drop of about 1V, I recommend a 12V8.5A about it
But we should pay attention to the power supply is relatively good brand (such as: Taiwan meanwell, Chaoyang) are good, the price is not high, the power of your 4A is that its total power is 4A, the number of the current from the power supply automatic for how many current with each of your camera. The 4A power supply with 3 monitoring points is sure to be ok.
It depends on what kind of camera, if the power supply is normal or bolt with 1 hemisphere 12V/1OA enough, if there is an infrared camera of high power requirements, according to each infrared camera 1.5A-2A calculation.
If you watch your camera, each camera is how much of the current name ma. You can count on it
