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I played around years ago with solar powered USB charging and I will connect my testing devices to the Volt and my Iphone and give you some numbers.

One thing to keep in mind is we use blue-tooth linking with cell phones in the car and that uses extra power and add in cell use will be more power.

Getting step rate of charge information from Apple even for hardware developers is not easy.
To get any charge on some older USB-2 ports the phone/pad has to be in sleep mode.

USB power available from the sockets is all over the map as well.
 

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Ok here are some NUMBERS:

The std Apple Iphone wall charger is max of 5 Watts ( 5 Volts -1 amp) for ref the Ipad wall charger is 10 watts ( max of 2 amps)

The Chevy Volt is outputting 4.57 Volt at 0.48 amps which is 2.1 watts at the USB port
As you can see you are getting less then 1/2 the charging of the normal 120v wall charger.

Using a common 2 inch long Belkin power port USB charger I got 5.01 Volt at 0.92 amps or 4.6 watts.

I have seen some power port chargers that go to 2 amps ( 10 watts)

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I think we can now say that 2.1 watts charging may not keep up with a smart phone doing too many functions.
Blue-tooth and cell calls and GPS and I guess the normal music function.
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I can run some more test on I-Phone 4s doing these function after it completely charges.

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Testing using the watts-up inline meter:
http://www.powerwerx.com/digital-meters/watts-up-meter-dc-inline.html
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