I use an MBeat seven port powered hub, which has three USB2 and four USB 3 ports, and a USB3 cable to the laptop. It has individual port switches. I have it mounted by velcro to my tripod leg when at the dark site, and velcro mounted to my pier in the observatory. Excellent piece of gear, never any problems. However, it is powered by a 5V DC plug pack that converts from AC. In the field that means i carry a small inverter to run it off my battery, but i now have a DC-DC converter which i am going to use to step down from 12V to 5V DC. In the Obs it runs off AC of course,
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