100 votes
Accepted

Raspberry Pi Power Limitations

Power requirements of the Pi Raspberry Pi Ltd. (Raspberry Pi Ltd.) has recommendations for various models which range from 700mA to 3.0A. These are quite generous, and all models will operate on a ...
Milliways's user avatar
  • 59.5k
33 votes

How can I cut power coming out of the Pi's USB ports?

You can use my tool uhubctl, it supports Raspberry Pi models B+, 2B, 3B, 3B+ and 4B - these models have hardware ability to turn USB power off and on. Use it like this: Turn off power to all USB ports ...
mvp's user avatar
  • 509
21 votes
Accepted

Can the Pi 4 power 2 external USB 3 HDDs?

Not without voiding your warranty. An RPi4 can deliver a maximum of 1.2 A to all the USB ports together. This is done to protect the USB-C connector which is rated for 3A maximum. The disks you have ...
Dmitry Grigoryev's user avatar
11 votes

Choosing a Pi4 power supply

Use a PoE Hat: Third-party USB-C charging devices can be cheaply wired, potentially destroying connected devices as well as starting fires. A safer alternative is to power your Pi using PoE which ...
F1Linux's user avatar
  • 1,667
10 votes
Accepted

Powering Raspberry PI With Broken Micro USB Connector

This qualifies under category circuit rework. The "best" solution, if the pads are still usable, is to purchase the replacement part and re-attach it. The part is about $1 USD but this does not ...
crasic's user avatar
  • 2,983
9 votes
Accepted

Choosing a Pi4 power supply

The best option is a good quality power supply, as cheap brands may say they are rated at 2.4 amps, when they don't actually supply that much. Based on the numerous bad experiences i've had with 3rd ...
nikodean2's user avatar
  • 180
8 votes

How much energy does the Raspberry Pi consume in a day?

Power Consumption Benchmarks The instrument used to measure power consumption with the Dramble and individual Raspberry Pis: PowerJive USB Power Meter In all measurement cases, nothing is plugged ...
Raghav Dinesh's user avatar
8 votes
Accepted

Can I power a Raspberry Pi 3 with a Smart TV's USB-Port?

According to the Raspberry Pi FAQ on Power requirements ( which can be found here --> https://www.raspberrypi.org/help/faqs/#powerReqs ): Maximum draw from USB = 1.2A Recommended Power Source =...
Jaxian's user avatar
  • 206
8 votes
Accepted

Is it safe to power my external hard drive with a Raspberry Pi 3 B+ USB port?

You SHOULD be able to power a USB HDD from the Pi3B+ as the USB ports can supply 1.2A. HOWEVER, I and others have found that this is often unreliable - this seems to be due to transient voltage drop ...
Milliways's user avatar
  • 59.5k
8 votes

Choosing a Pi4 power supply

The spec specifically states that: A good quality 2.5A power supply can be used if downstream USB peripherals consume less than 500mA in total. Using a 2.4A power supply with the Pi 4 and a 2.5" ...
Ghanima's user avatar
  • 15.8k
8 votes

USB Powerbank for Raspberry Pi 4

The Raspberry Pi 4 spec recommends a 3 A supply (15 W), with a minimum current of 2.5 A if downstream USB peripherals consume less than 500 mA in total. Furthermore the MagPi benchmarks a power draw ...
Ghanima's user avatar
  • 15.8k
8 votes

Can Rpi3B+ power two USB SSD drives?

Question For connecting two USB SSD/HDDs, does an Rpi USB Hub need any external power? Short Answer Update for Rpi4B buster 2020apr16 Soon after my 2019jul answer below, I upgraded from Rpi3B+ ...
tlfong01's user avatar
  • 4,665
7 votes
Accepted

Connect USB hub to RPi 4 USB C port to power the Pi and access peripherals?

The Pi4 DOES NOT have any USB-C ports. The USB-C connection is only for power (although it does support USB-2 OTG).
Milliways's user avatar
  • 59.5k
6 votes

Raspberry Pi Power Limitations

The Raspberry Pi Foundation recommendation has always been 5V plus or minus 0.25V. In practice the Pi works from just over 3.3V to just under 6V. Personally I would limit the voltage to less than 5....
joan's user avatar
  • 70.9k
6 votes

Does a USB hub work with Raspberry Pi Zero?

The internet, e.g. here, claims both that it works and that it does not at the same time. I have a Zero with an old 4-port USB 2.0 hub (that just happend to lie about) that works just fine. While ...
Ghanima's user avatar
  • 15.8k
6 votes
Accepted

Pi Zero overlay to swap power and data usb ports?

No. The micro USB ports are hard wired.
joan's user avatar
  • 70.9k
6 votes

Can Rpi3B+ power two USB SSD drives?

The Pi3B+ can supply up to 1.2A total across the 4 USB ports. See Raspberry Pi Power Limitations. This assumes the Pi power supply is adequate. Whether this would be adequate for 2 SSD drives, ...
Milliways's user avatar
  • 59.5k
6 votes
Accepted

Pi 4 - How to be sure to order a model with usb fixed?

Yes - the RPi 4 has had some "controversies" (il dibattito?). One is related to a flawed USB-C interface design. The other is not a design flaw, but rather a thermal management issue. Here ...
Seamus's user avatar
  • 21.7k
5 votes

Power usb short circuited my raspberry pi

You likely blew the polyfuse. But, pins GPIO pins +5V and ground (2 and 6) could be used to power Raspberry Pi as well. That pin is connected after polyfuse, so if you power it this way you may well ...
Nikita Kipriyanov's user avatar
5 votes

RPI4 won't boot with powered USB hub

The issue could stem from the fact that some cheap USB hubs back-power an unpowered host when those hubs are powered: essentially, the 5V circuit of the hub is directly connected to the 5V line of the ...
Dmitry Grigoryev's user avatar
5 votes
Accepted

Powered USB3 Hub vs USB3 Y Power Cable

This answer is incorrect. Depending on model & OS USB can supply 1.2A. Typical Power Requirements I doubt it would work, according to this page: USB - port power limits the Raspberry Pi USB ...
ON5MF Jurgen's user avatar
5 votes

Rpi3B+ micro USB connector got 15V power. Is it dead? Can I save it?

To restore it will cost somewhere between £5 and £55 depending on whether you buy a Zero or a RPi4B 4GB (or something in between). Connecting 15V is 100% guaranteed to let the magic blue smoke escape ...
Dougie's user avatar
  • 5,271
5 votes
Accepted

How to power a Raspberry Pi 3 for USB HDD for storage

My PSU is a 30W 3USB ports Aukey supposedly able to deliver up to 2.4A per USB port But that's not really a PSU; it's a battery charger. USB chargers are generally not intended to be (or sold as) ...
goldilocks's user avatar
  • 58.7k
5 votes
Accepted

can I use two 4 TB disk powered by USB on RPI-4? No external power supply

"My guess is that RPI-4 can't handle 2 usb powered disks. Both disks are fine, but the logs say there are problems." Your guess is correct. This is something that appears regularly on ...
Michael Harvey's user avatar
5 votes

Can I use a battery bank for raspberry pi?

Short answer: yes, you can use a battery pack. The RPi recommends a power supply of 500mA and most good battery packs can supply more current than that. As for the 20 hours of operation, you would ...
nate's user avatar
  • 191
5 votes
Accepted

Raspberry Pi random reboots (Raspi 3B+)

A charger isn't a PSU. Also the cable quality can make a big difference. In this case with a RPI3+ I would say the power supply is the most plausible cause of the reboots. Also check after some time ...
Janghou's user avatar
  • 1,446
4 votes
Accepted

How to measure battery voltage?

You will need to add external circuitry if you want to monitor the battery voltage. As a minimum you will need an ADC (Analog to Digital Converter) and a pair of resistors to convert the battery ...
joan's user avatar
  • 70.9k
4 votes
Accepted

Keyboard and mouse stops working after connecting usb hard drive

Just like most other issues with the Raspberry Pi, this is most likely a power issue. Make sure you are using a short and thick USB cable. And a supply that provides at least 5V at 1A, but I highly ...
Patrick Cook's user avatar
  • 6,365
4 votes

is it possible for the raspberry pi 2 to disable usb interface rx and tx?

Just like this question/answer suggests, there is no way to cut the power or the TX/RX on the USB ports with just software. You will need to add a transistor and do some fancy wiring, which is all ...
Patrick Cook's user avatar
  • 6,365
4 votes

What could be causing "over-current change" all the sudden?

NB: as noted in the comments below, max_usb_current=1 is deprecated and now has no effect. A lot has changed with the Raspberry Pi's firmware since this question was asked in 2016. over-current change ...
scruss's user avatar
  • 9,048

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