30 votes

Will any external battery power a Raspberry Pi?

Short answer Yes, most (but not all!) USB power banks are capable of powering a Raspberry Pi, since they usually have an output voltage of 5 V. And yes, by using a (quite large) 50 Ah power bank, you ...
  • 423
23 votes
Accepted

Make "iw wlan0 set power_save off" permanent

Power save mode was an issue years ago on older versions of Raspbian. But it is fixed for a long time. Now it is disabled by default with the WiFi driver brcmfmac. You will find it if you grep the ...
  • 40.6k
17 votes

Make "iw wlan0 set power_save off" permanent

I did it by simply adding a line to /etc/rc.local /sbin/iwconfig wlan0 power off Add that ahead of exit 0 and it will run at every boot.
  • 4,960
16 votes

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

I am running a Raspberry Pi2 with a 2TB Western Digital element hard disk mounted as root disk (apm set to 254 - effectively disabling standby) via a Y-connector. Using a USB VA meter (eBay link - ...
13 votes

Is it possible to create a keyboard shortcut that acts as an on/off switch?

The main issue is the fact that the RaspberryPi's hardware design actually does not offer a power-off circuitry. So the answer is that without additional hardware it is not possible to power the ...
  • 15.6k
11 votes
Accepted

How to make the Raspberry Pi consume less power

Unplug it from mains power :) But seriously: the Pi has a "base" power usage when run headless, without anything plugged in (no monitor, no usb devices, just the power supply). Use a Kill-A-Watt ...
  • 5,013
10 votes

Will any external battery power a Raspberry Pi?

As long as the power bank outputs 5V it will power the Pi. It claims 50000mAh so it claims 2.5 amps per hour for 24 hours. Assume it will deliver half that so 1.25 amps for 24 hours. If that is ...
  • 67.9k
9 votes
Accepted

Pi Headless: How to confirm that the Pi is shut down

Your solution is simple, use an inverter, and a start up script. When The script runs, have an IO pin go high, which will force the LED off. When the OS is off, and the script driving the IO pin is ...
  • 2,383
9 votes
Accepted

Can I use a DC-DC step up module to power a Raspberry Pi from 2AA batteries?

Yes, should do Just double checking the datasheet of the MT3608: if using AA rechargables instead of batteries, mind the lower voltage (cell voltage 1.2 V), but for two cells in series still above ...
  • 15.6k
9 votes

Differences of Raspberry Pi models in GPU computation?

I believe the GPU is identical in all Pis and makes up 95% of the silicon. The remaining 5% is used by the relatively puny ARM core(s). See https://www.raspberrypi.org/documentation/hardware/...
  • 67.9k
8 votes

How to make the Raspberry Pi consume less power

Other things you may want to search for include disabling the LEDs, disabling HDMI out and 'nohz' kernel option to alter the tick interrupts from periodic clocks. Articles I've seen also suggest that ...
8 votes
Accepted

Will RPI3 power down an external USB hard disk if not used for a certain amount of time?

Yes. Here's what I use: hdparm -B 127 /dev/sda hdparm -S 242 /dev/sda From the command line as the pi user you would have to add sudo there. The first line enables spin down. The second one sets ...
  • 56.5k
8 votes
Accepted

What is the minimum power required for an RPi 4 in `halt` or `shutdown`?

Q1: Is it possible to realize the claimed current draw of "about 3 mA" in any inactive state? A1: No - at least not with the tools covered in the "Official Documentation". To frame ...
  • 18.8k
7 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 ...
7 votes
Accepted

RPi 3 - Reduce power consumption

As far as I know, you can not disable only one USB. When you turn USBs power off, also the Ethernet port turned off. I don't know if there is a way to disable USB/Ethernet in config.txt, but in cmd ...
  • 131
6 votes
Accepted

Car computer how to connect to car battery and also not drain battery when the car is switched off

I have not measured it myself, but this person claims the pi draws about 110 mA after shutdown, i.e., when the OS has halted and just the red PWR led glows. Figures regarding the number of amp-hours ...
  • 56.5k
6 votes

Is it possible to create a keyboard shortcut that acts as an on/off switch?

You will need peripheral hardware to turn the pi on and off, since it does not have a power button. The good news is that it is fairly simple to build one, and not very expensive. Have a look at: http:...
  • 2,919
6 votes

Low Energy Consumption Kernel

The kernel already consumes negligible power. The software loaded on the pi would be the ones munching the most power because of processor time (Apache, databases, networking, etc.) Here are some ...
  • 7,088
6 votes

Powering a Raspberry Pi from a vehicle battery 24/7

The Pi draws about 300mA at 5V, plus whatever your GPS unit would draw. Ignoring the small losses associated with a (switching) step-down converter. Say a total of 2W. That would be equivalent to ...
  • 1,858
6 votes

Raspberry Pi 3 Model B+ got hot even in idle

51 deg C is actually reasonably cool for a Pi3. My Pi4 regularly runs at over 60 deg C. Don't worry about it.
  • 6,381
6 votes
Accepted

Does Raspberry Pi 4 consume considerable amount of power in soft-off state?

The Pi has 3 "components" the CPU, GPIO and Video Core which are relatively independent. Even when the Pi is shutdown the Video Core continues to run, and the GPIO pins retain their state; ...
  • 54.8k
6 votes
Accepted

Starting Pi 4 with global_en

The Organization's schematic is incomplete, but it does show GLOBAL_EN connected to U2 - the PMIC (Power Management Integrated Circuit). Pulling GLOBAL_EN low (aka shorting to GND) resets the PMIC - ...
  • 18.8k
5 votes

Pi Headless: How to confirm that the Pi is shut down

In Raspberry Pi 3 you can trun off the PWR LED with echo 0 | sudo tee /sys/class/leds/led0/brightness If the Pi is shut down, the LED will turn on again.
  • 259
5 votes
Accepted

Raspberry Pi B+ usb port disable

No, it is not possible to enable/disable or power down any single USB port. The hub providing the different ports is connected to one root USB port, thus it's none or all. Ok, but is it possible to ...
  • 15.6k
5 votes
Accepted

RPI Forever On?

The conventional solution to this problem (as others have pointed out) is a Watchdog. There is a watchdog daemon, which you can install, but no one can design it for you, as this depends on what ...
  • 54.8k
5 votes

2 amp power supply for RPi2. Too much current?

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 ...
5 votes

Powering a Raspberry Pi from a vehicle battery 24/7

I just wanted to let you know that I actually did this and had some bad results. The upvoted answer is correct that your battery will last a long time while powering the Pi. What he doesn't mention ...
5 votes

Is it possible to toggle 3.3V and 5V header pins on and off?

No it is not possible to toggle the power rails in software. They are both powered whilst the Pi is powered. Look at the schematics for your model here.
  • 67.9k
4 votes

Will any external battery power a Raspberry Pi?

Sources on the Raspberry Pi forums say the Raspberry Pi uses approximately 500mA add in the 250mA for the camera module, and round for a safety margin equals approximately 1A. A 50,000mAh battery ...
4 votes

Will any external battery power a Raspberry Pi?

Something to keep in mind is that some power packs will shut themselves down if there isn't enough of a power draw. For example, I have a New Trent PowerPak+ 13500mAH power pack, which shuts itself ...
  • 41

Only top scored, non community-wiki answers of a minimum length are eligible