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I have 3 Raspberry Pi zero but limited electric sockets. Is it possible to connect and power them using a USB wall charger? Any 220V model recommendation?

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In theory YES, you can use a USB wall charger... and here comes the BUT:

  • Make sure they have an appropriate rating. 5V 1A should be sufficient for Pi Zero.
  • Make sure those are not too old ones that came with a mobile phone (I think of 2007 and prior). (The problem is, some of them provide even more than 6V. While this is fine for charging a battery, it will burn your Pi)

If you don't have the equipment to verify yours than have a look here: Power adapters

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