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Raymo
If your laptop is powered off there will be no voltage at your USB ports for charging or other requirements ( unless yours is different? )
Once powered on the USB ports provide the following -
USB2 5V DC max 500mA or 0.5 amp
USB3 5V DC max 900mA or 0.9 amp
I assume these specs are for continuous rated load not transient load caused by a motor or transformer or the like
Nano tracker has a stepper motor but do not know it’s current draw as the voltage would fluctuate between 3.5 to 4.8 volts during operation
Don’t know if this helps at all
Cheers
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