sir this is accurate for me.
---MATH---
12V x 10A = 120watts
so we have 10 ports @ 5V each
120watts/10 ports = 12watts each port
so 12watts/5V = 2.4amps per port
they put 2.1amp per port to be safe +/- 20%
from that calculation you are right, what i meant is that the psu itself draws some power.
It converts from 220 V or 110V to the 5V.
Usually the PSU will draw ~ 20% of the input power to generate the desired output.
Since the 120 is from the wall, i thought the power at the port cannot be 12 Watt.
With 80% eff we have 9,6 Watt per port. Maybe i am missing something.
@jstefanop Was 1.9 A enough when you tested it the last time ?
