many usb hub are not powerful enough and cheap made to sell in the market.
i use RAZORFISH SOLUTIONS usb hub stable quality, multi ports charging same time.
USB HUB fast charger tablet ipod ipad phone USB BITCOIN Razorfish
Razorfish Solutions manufacturers
USB HUB fast charger 19 Port USB Hub with Integral power supply and Steel/Aluminum case
This is a 19 port hub With an integral power supply capable of
reliably supplying MORE that 500mA per port without overheating or becoming a fire hazard.
16 Front facing Standard A USB ports 3 Side facing Standard A 1 Master hub connection
Standard B for connection to Computing Equipment or other hubs Fully fused internally via multiple poly-fuse resettable fuses both on each individual port and on the main power feed to the Ports.
Unlike may of the cheaper USB ports that only implement links at 1.0 12mb/s speeds
(but state they are 'compatible' with USB 2.0)
this is a professional FULL 480 Mb/s port that complies and implements the full 2.0 USB standard,
it may also be used to connect to generic USB 1.0 equipment.
