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All replies
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Helpful answers
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Aug 31, 2013 6:42 AM in response to Fidelityby jeremy_v,Hi Fidelity,
Thanks for visiting Apple Support Communities.
See this article for some information about high power USB ports on a Mac:
Apple Computers and Displays: Powering peripherals through USB
http://support.apple.com/kb/HT4049
Best,
Jeremy
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Aug 31, 2013 8:11 AM in response to Fidelityby Eustace Mendis,"needs minimal current - likely ~ 8-12w"
Watts = amps x volts.
So to draw 8 to 12 watts of power from a 12 volt supply means a current of 2/3 to 1 amp. That's 667 to 1000 milliamps.
You should confirm that your MBP can provide that current. I believe that built-in USB2 ports peak at 500 milliamps.
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Aug 31, 2013 8:29 AM in response to Fidelityby Lexiepex,The output of the USB ports is 5Volts and 500-1000mAmps (max 5W at 5 volt), a device that needs 12 Volts and then 8-12 Watt should not be connected: it is much too heavy for the USB port and it will not work because the USB port is only 5V.
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Aug 31, 2013 8:37 AM in response to Fidelityby Allan Eckert,My suggestion would be to see if you can find a powered USB hub that is capable of delivering that amount of power.
I am skeptical of you finding it because I believe the 5V and 500 mA is in the USB spec.
No matter what the Mac can't do it.
The only other alternative I can think of is to talk to the vendor of the device to see if they can supply with something that provides that amount of power.
Allan
