A:AnswerThe amperage (amps or milliamps) can be determined using the physics equation of Power (Watts) = Voltage x Current (Amps). So theoretically this charger provides 6amp output according to the equation (30W / 5V = 6A), but I think the actual output is going to be lower than 6 amps because of resistors and other things on the tiny circuit board inside. And as far as I know, standard USB cables with an A plug on the charger end (instead of a C plug) are only rated at 5A max. Another thing to take into consideration is that the advertised power or amperage is going to be the combined total of all the ports, and if it has more than one port, then each port is less than the advertised amperage or power. For example, most chargers with 2 USB ports might claim to be 3.1 amps, but one of the ports has only 2.1 amp output and the other port has only a weak 1 amp output. It's kinda an advertising scam, in my opinion.
This answer is very technical... Sorry not sorry! Hope it helps.