A good power supply is essential for the proper operation of the Raspberry Pi. A power supply of at least 3A (3000mA) of USB-C type is necessary for the new Raspberry Pi 4 (2GB, 4GB or 8GB). 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.

Warning. Some power supplies have a switch. Never use this switch to shut down the Raspberry Pi. You must stop the operating system from the menu bar or with the sudo halt command from the Command Terminal. Disconnecting the power supply when the Raspberry Pi is operating is the primary cause of data loss or deterioration of the Raspbian operating system.

Even with a quality SD board and power supply, remember to backup your data regularly or clone your SD board by following this tutorial.

5V / 3A micro USB power supply for Raspberry Pi or other nano-PC

This power supply may also be suitable for supplying your projects with connected objects based on ESP32 or ESP8266. Some generic Arduino development boards also use a micro-USB connector

NorthPada Raspberry Pi 3 Model B Power Supply Charger AC Adapter 5V 3A PSU Micro USB 5 Feet with...

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Power Supply 5V 3A with Switch UL 2.5A 2A 1.5A 1A Fast Rapid Charge AC Adapter w/ 1.5m Extra Long...

$10.99

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5V / 3A USB-C power supply for new Raspberry Pi 4

The new models of Raspberry Pi 4 are equipped with a USB-C type connector. A power of at least 3A is necessary to power the new models of Raspberry Pi 4.

5V 3A Type-C USB AC/DC Wall Charger Adapter Power Supply Cord For Raspberry Pi 4 Model B Power...

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With Switch Data Power Supply Durable Digital Charger Cable Wire 5V 3A USB To Type C Adapter...

$2.59

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Power Adapter for Raspberry Pi 4 Generation 4B 5V 3A Type-C Charger EU US Plug Power Supply for...

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5V 3A USB Type C Power Supply Adapter with ON/Off Switch for Raspberry Pi 4 Model B (1G,2G,3G)

$6.25

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CanaKit 3.5A Raspberry Pi 4 Power Supply (USB-C)

$9.99

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Enokay Raspberry Pi 4 b Power Supply 5V 3A USB C Charger Adapter (UL Listed)

$9.99

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UPS HAT for Raspberry Pi

Expansion board (HAT) equipped with one or more high capacity batteries (18650) to power the Raspberry Pi 4 (or old models) in the event of a power failure (inverter or UPS system). The HAT UPS also makes it easy to develop mobile projects requiring battery operation. For example robotics, RC, autonomous navigation, data logger.