Reviewing power supply requirements
One of the outstanding things about the Raspberry Pi Zero is its low power requirement, even compared to its siblings. The power is received through the second micro-USB slot on the board, and it should never need greater than a 5-V/1 A power supply. A well-configured Raspberry Pi in idle state can draw as little as 30 mA, and even under stress, it has not been shown to use more than 350 mA! Your Raspberry Pi Zero could run for free with a small solar panel and rechargeable battery pack. The Raspberry Pi 2 and 3, while more powerful, generally use from two to five times as much power to run.
How to do it...
You can also power your Raspberry Pi Zero over the GPIO ports, though it is important to be careful to have ...
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