Yes it is possible, but consider the consumption and Costs.
How much electricity does it take to power your iPhone for a year?
The answer: 1 kWh.
This is the amount of electricity you’d need to power ten 100-watt incandescent light-bulbs for an hour.
Far from anything worth being sheepish over, 1 kwh costs about 12 cents.
To be specific, your iPhone battery holds a charge of 1,440 mAh, or about 5.45 watt hours. If you fully drained and recharged your phone everyday, then over the course of a year you would have to feed it about 2,000 watt hours, or 2kWh = 25 Cents per Year.
As for your iPad, keeping it fed costs just $1.36 a year, according to the Electric Power Research Institute.
Your average laptop, with its far bigger screen, uses about 72 kWh, costing some $8 a year.
There is your challenge:
Make a power station that has a ROI such to recover the cost using the 25 cents per Year returns.
Answer: if it cost you $20 to make the power station- it will take about 40 Years before you see benefit.
Best Answer
They are the only options as of now. They are slow because of your internet.
Even USB have speed limitation.
And using a USB cable 6 or 12 feet long would defeat the purpose (you are to close to the Mac for any benefit).
Your WiFi speed should be good enough to watch streaming Videos without delay showing > 200kb/s.
To check, click on the WiFi while holding the alt key, that will open more detailed information on your WiFi.
In there it should say
MCS index >10