I'm currently using a 5V 2A power supply; not sure if it is appropriate because some answers say that the max safe current is 1.2 amps. I'm a little confused about this. Is it safe to use my current power supply?

  • 3
    With a "voltage source" as a power supply (which is the kind all of those supplies are) there is simply no such thing as "too much current"! related (if not dupe) raspberrypi.stackexchange.com/questions/26083/…
    – Ghanima
    Commented Jan 23, 2016 at 9:09
  • 1
    As Ghanima points out, if the voltage is fixed, then the current is determined by the (resistance of the) pi itself: I = V/R. If you reduce the voltage, the current will also drop and the pi won't work. If you increase the voltage, then the over current can damage it . Your household circuits are probably 15 or 20 A @ 120V, but they do not burn out low wattage (high resistance) light bulbs instantaneously.
    – goldilocks
    Commented Jan 23, 2016 at 12:41
  • Unfortunately that seems to be a very common misconception...
    – Ghanima
    Commented Jan 23, 2016 at 13:38
  • Whatever you do do not use a fast charger Commented Oct 30, 2019 at 7:20

3 Answers 3


Yes it is safe. The raspberry pi will only draw the current it requires. I use a 1.2A power supply and my raspberry pi draws only 0.53A while running a stereo vision algorithm in the background. This is what i used to test it:

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A higher ampere rating on a charger would give you more flexibility such as when adding more usb type peripherals such as a Mouse, Keyboard and Hardrive. The official raspberry pi charger itself is rated at 2A. I am using both chargers, one each for Pi (I have 2 Pi's).

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  • 1
    You should flip the first image so people can read the text.
    – akaltar
    Commented Jan 23, 2016 at 14:54
  • @akaltar Neck exercise.
    – Aloha
    Commented Mar 23, 2016 at 2:18
  • It's reading 4.84V :)) Commented Mar 23, 2016 at 3:51

It is absolutely safe, though you might not need 2A all the time. It depends on number of external devices you have attached to the pi. For example, when I was running pi headlessly along with 2 wifi adapters, I could see current drop intermittently on any one of the adapter. I was using 1A or 1.2A power adapter then. The problem got resolved when I used 2A power adapter.


The big issue mostly is people trying to run peripheral USB devices that try to draw a lot of power thru the RPi....solution is to use a powered USB hub which will provide power thru its' own power bus and not the RPi....the creator of wall warts should be tried for crimes against humanity :)

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