What is the power consumption of the camera day?
According to the DC power conversion efficiency of 80%, the input power = 18W / 0.8 = 22.5W
24 hours electricity consumption = 22.5WX24 hours = 540 watts = 0.54 kWh (1000 W = 1 kWh)
This power consumption is negligible. The The 10 cameras plus 24 hours can consume about once electricity