The micro iUSB 3.0 is limited by mainly by the power supply that powers it.
Using the 9v iPower to operate it, the micro iUSB 3.0 can offer full 1.5A per USB port pair, so 3A in total.
Please note that the USB specifications are as follows:
- USB 2.0 – 100mA/500mA max.
- USB 3.0 – 900mA max.
- BC1.2 – 1500mA max.
