The recommended amount is between 700ma for a raspberry pi model a and up to 2 5a for a raspberry pi 3 model b see power supply requirements in the magpi issue 56 page 39.
Raspberry pi 3 b gpio power supply.
The raspberry pi 3 model b is the latest product in the raspberry pi 3 range boasting a 64 bit quad core processor running at 1 4ghz dual band 2 4ghz and 5ghz wireless lan bluetooth 4 2 ble faster ethernet and poe capability via a separate poe hat.
An individual gpio pin can only safely draw 16ma.
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Check out our guide on helpful raspberry pi linux commands.
For raspberry pi 4 we recommend our 3a usb c supply.
Any portable battery designed to charge a smartphone over usb can be used with the raspberry pi.
The gpio pins can draw 50ma safely distributed across all the pins.
Any external power supply used with the raspberry pi 3 model b shall comply with relevant regulations and standards applicable in the country of intended use.
Would recommend that you utilise a high quality dedicated raspberry pi power supply to get the best results.
Earlier models demanded a lower draw of 5v at 1a but in practice greater amperage is usually preferable.
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For raspberry pi 0 3 we recommend our 2 5a micro usb supply.
The raspberry pi boards typically draw much lower amounts between 200 and 500ma.
The power requirements of the raspberry pi increase as you make use of the various interfaces on the raspberry pi.
Raspberry pi power supply soulbay 5v 3a micro usb ac adapter with 6feet long cord for raspberry pi 3 2 model b b pi a a zero android tablet compatible with dc5v 2 5a 2a 4 8 out of 5 stars 40 10 49 10.
Sold as a dedicated solution is the battery pack for raspberry pi 3 b from vge.
Here are 10 ways to power a raspberry pi.
Mode 2 via the gpio.
The latest versions of the raspberry pi b a 2 have a low voltage indicator icon to notify the user if there is a problem with the power.
For low power projects you can reduce the amperage quite a bit before it affects performance or stability.