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After some more measurements I see that when running on battery there are loads of USB error messages during startup. Then the voltage on the USB port becomes 4.2 V, while power from a DC/DC step down regulator fed into odroid is 5.25V. Still all other USB devices works well (WiFi, camera), but not the kinect. Current to kinect is 0 A.

After some more measurements I see that when running on battery there are loads of USB error messages during startup. Then the voltage on the USB port becomes 4.2 V, while power from a DC/DC step down regulator fed into odroid is 5.25V. Still all other USB devices works well (WiFi, camera), but not the kinect. Current to kinect is 0 A.

[Later] It didn't work with better (at least more expensive) regulators. First I thought it worked then I realized that the charging cable to the kobuki was attached. So it still doesn't work when running kobuki on battieries but it works when charging is attached. I use 2 5V/3A regulators to the 12V/5A kubuki port.

Could it be a ground problem??