#Deal: power supply 5V / 3A (3000mA) micro USB for Raspberry Pi 3 (or Raspberry Pi Zero)
A good power supply is essential for the proper operation of the Raspberry Pi 3 or the Raspberry Pi Zero W. The power consumption of the Raspberry Pi is very low but it is advisable to have at least 2A (10W). If you use USB devices or your projects use actuators or sensors on the GPIO connector, it is best to opt for a 3A (15W) power supply. If the operating system freezes or the Raspberry Pi is unstable (unexplained restart), it is probably because of a power supply too low or poor quality.
Even with a quality SD card and power supply, remember to backup your data regularly or clone your SD card by following this tutorial.