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Experiments showed me the following:
Kinect can actually handle a small voltage swing pretty well. I had no problems with 11 to 13.5V although I would advice against it. Using a typical 7812 or LM1084-12 is the best option. Also a ATX output provides a stable 12V (sometimes they do need a minimal load). The kinect PSU is rated for 1 or 1.5A, but using the Kinect with camera + pointcloud only, I never got it above 500mA. However the current peaks can bring the robot down. (both lowering the battery voltage and draining the battery faster) This was not tested on an Create but on a Roomba. This is why we choose to sell our Turtlebots with a battery connection.
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