101
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 ...
- 61k
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 ...
- 509
24
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 ...
- 28.1k
11
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 ...
- 3,003
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 ...
- 1,667
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 ...
- 180
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 =...
- 206
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 ...
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 ...
- 61k
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" ...
- 15.9k
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 ...
- 15.9k
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+ ...
- 4,767
7
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 ...
- 1,410
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).
- 61k
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....
- 71.5k
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 ...
- 15.9k
6
votes
Accepted
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, ...
- 61k
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 ...
- 22.6k
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 ...
- 28.1k
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 ...
- 313
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 ...
- 5,353
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) ...
- 59.5k
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 ...
- 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 ...
- 1,446
4
votes
Accepted
USB ports stop working after a week, needs restart
Here's a method about controlling the power to ports on a USB hub,
using software - the hub-ctrl.c app from a question that another
post above links to.
It can be used to wake up the USB ports (at a ...
- 162
4
votes
Accepted
Switch power banks by temporarily attaching two of them
I don't think a Y-cable would work since the two power banks would compete and eventually (if not instantly) one of them would break and possibly take the Pi with it.
This solution might work (it ...
- 7,156
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 ...
- 9,087
4
votes
RPI3 USB port current?
See Raspberry Pi Power Limitations for detail of the Pi3 power.
NOTE the Pi3 SHOULD be able to power, but my experience indicates this is not so. It is a combination of PSU which don't actually ...
- 61k
4
votes
Accepted
Raspberry pi powering issues
In the right top corner of the connected lcd screen, there is a small yellow thunder icon constantly. What does it stand for and more importantly, how to turn it off?
Connect to an adequate supply! ...
- 61k
Only top scored, non community-wiki answers of a minimum length are eligible