Skip to main content

Questions tagged [power]

Power is the rate at which energy is supplied or consumed, often measured in Watts. This tag covers electrical power specifically, the voltage and current specifications for supplying power to the Pi, the specifics of power consumption by the Pi, and methods for controlling Pi power consumption.

Filter by
Sorted by
Tagged with
88 votes
3 answers
196k views

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

My searching efforts have failed when trying to find this. On average, how much energy does the Raspberry Pi consume in 24 hours (minimal usage vs. max usage in a day and USB vs. Micro-USB powered)?
Zero's user avatar
  • 923
56 votes
11 answers
52k views

Can I use Raspberry Pi as a USB peripheral device?

Raspberry Pi has a Micro USB port for power supply. My question is if this port is only for power purposes or can it be used for data as well? I would like to be able to attach my Raspberry Pi as a ...
user avatar
50 votes
2 answers
117k views

Raspberry Pi 3 vs Pi 2 power consumption and heat dissipation

I've seen the announcement of the new Raspberry 3 but didn't find any info regarding power consumption and heating. A 1.2 Ghz 64-bit CPU is great but does it draw a lot more power? Shall heat be an ...
Cedric Martin's user avatar
45 votes
5 answers
74k views

Power consumption of Pi Zero W?

For those who have the Pi Zero W with them, what is its power consumption in the following modes: No peripherals connected, WiFi And Bluetooth off Only WiFi turned on Only Bluetooth turned on Only ...
HRJ's user avatar
  • 553
45 votes
2 answers
159k views

Is setting `max_usb_current=1` to give more power to USB devices a bad idea?

I've been searching around for more information on the /boot/config.txt configuration directive max_usb_current, trying to find out exactly what happens when that is set to 1, but it's hard to find ...
geerlingguy's user avatar
  • 1,636
43 votes
5 answers
77k views

How Raspbian Detects Under Voltage

How does the Pi know it being underpowered and to show the lighting bolt? As most of us know, if you use a bad power supply you get the lightning bolt telling you are underpowered. I noticed that when ...
NULL's user avatar
  • 2,230
43 votes
5 answers
99k views

How do I measure the current power consumption?

Is it possible to measure (with software, like PowerTOP) the Pi's current power consumption, on my Raspberry Pi?
cupakob's user avatar
  • 1,027
36 votes
8 answers
131k views

Will any external battery power a Raspberry Pi?

I am working on a project that needs the Raspberry Pi to work without a mains connection. I have considered buying a 50000mAh USB power bank. Would this power a Raspberry Pi, and if so, would it ...
Joel's user avatar
  • 527
34 votes
8 answers
74k views

How to safely switch off the Raspberry Pi?

Usually with a desktop computer, if I run sudo shutdown -P now, the computer switches off completely and I can switch it back on again with a button. (Likewise, if the computer crashes, I can force a ...
George Simms's user avatar
34 votes
6 answers
113k views

Powering a PI from 12V

I'm thinking of installing my Pi down at my wife's stables which have a 40W solar charged 12V DC lighting circuit. Since the Pi runs at 5V I'm thinking that a quick and easy way to step down the ...
DaveG's user avatar
  • 443
32 votes
5 answers
68k views

Why do the Pi GPIO pins use/give 3.3V and not 5V?

I know for a long time that people should NOT put more than 3.3V on the GPIO pins. They also give out 3.3V when high. I did some research and it seems no one really bothered asking. Almost all of ...
Aloha's user avatar
  • 7,156
30 votes
6 answers
81k views

Choosing a Pi4 power supply

I'm trying to decide what is the best option for powering a Pi4. The specs mention for a minimum of 3A. Let's consider we would also like to connect a 2.5" drive to the Pi4. Could someone more ...
m000's user avatar
  • 483
29 votes
7 answers
35k views

Why does the Raspberry Pi not have a power button?

If you buy a computer you expect it to come with a power button. So why does the Raspberry Pi not have one? Is it because it would take up too much room or be awkward to fit on the PCB? Personally ...
Darth Vader's user avatar
  • 4,196
24 votes
4 answers
29k views

Is it okay to just pull the plug?

Whenever I turn off my pi, I use sudo poweroff, which (in my understanding) is a safe way to stop all processes and shut down. Although sometimes when I'm using the Pi for embedded projects where I'm ...
James Vickery's user avatar
21 votes
4 answers
22k views

Current draw for +/2/3/0 models

Essentially "What's the current draw and supply voltage tolerance?" but for newer models.
Alexander M's user avatar
20 votes
4 answers
19k views

Raspberry Pi lifespan reliability

I have to set up a three monitor display for a museum, that will run 24/7 , and I think about a simple Pi wall. But I'd like to know if a Raspberry Pi is a good long term solution. The system will ...
Spoutnik16's user avatar
20 votes
9 answers
47k views

Use Raspberry Pi to control PC's power switch

Can I use the Raspberry Pi's GPIO pins to make the Raspberry Pi act as a switch? I would like to shut down, boot up and reboot my computer via hardware remotely. My idea was to take the PS_ON# pin ...
d3rrial's user avatar
  • 303
18 votes
1 answer
59k views

Powering the Pi 4 - safe voltage levels and current requirements

How to safely power the Pi 4, more specifically: What voltage levels are safe to power the Pi 4 via the USB-C connector or via the GPIO header? What are the current requirements? What Power ...
Ghanima's user avatar
  • 15.9k
16 votes
3 answers
5k views

Measure RPi3 power consumption without external hardware

I power my RPi3 using a power bank for smartphones, and I'd like to check how much power the Pi draws from it while my project is running. I don't have any special equipment for power measurement. Is ...
eden881's user avatar
  • 265
16 votes
4 answers
14k views

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

I am running my Pi headless connected to my wireless router using a ethernet cable. I wanted to shut down the pi remotely even when I am not connected to it using SSH/Putty to shut it down exclusively....
Kangkan's user avatar
  • 398
15 votes
2 answers
14k views

Use MacBook charger for Raspberry Pi 4

I am using the official 15.3W USB-C Power Supply to power up my Raspberry Pi 4. I got my self a second Raspberry Pi 4 but I haven't bought the power supply yet. Would I be able to use the Macbook ...
Dino's user avatar
  • 373
15 votes
2 answers
17k views

How to make the Raspberry Pi consume less power

What methods can be used to reduce the amount of power a Raspberry Pi uses?
Darth Vader's user avatar
  • 4,196
15 votes
4 answers
11k views

Turning on and off a 3G (or any USB) port?

I have a project which will require using a Raspberry Pi in a low power environment, but it will also require a 3G connection. I have not done any tests, yet, but I am under the assumption (and ...
TiernanO's user avatar
  • 321
13 votes
1 answer
20k views

Turning 'tvservice' on and off leaves screen blank

I'm running the Qt5 application on my raspberry pi and I would like to introduce some kind of a power-saving feature. I don't use x11 or wayland, because I don't need it, but I use gles2 (OpenGL for ...
lewiatan's user avatar
  • 713
13 votes
3 answers
11k views

HDD without external power is working. Is this dangerous?

I have connected a 2,5" HDD to my Raspberry Pi directly and it works. The only one question I have - Can my HDD/RPi be damaged? (When I use the HDD without powered usb hub - Are there any risks?)
cupakob's user avatar
  • 1,027
13 votes
2 answers
75k views

How long does the RPi last on a battery? [duplicate]

For how long can the Raspberry Pi run when powered from a battery of a given capacity? Of course this will strongly depend on how it is used and what devices are connected, but I am trying to get a ...
Szabolcs's user avatar
  • 662
13 votes
3 answers
8k views

Setting up the Raspberry as a data logger

As the title states I'm working on a simple embedded application which reads some information from the serial port and logs it to file, in addition to displaying a bit of status on the display. I'm ...
doynax's user avatar
  • 303
13 votes
3 answers
33k views

How to know how much battery power is remaining?

i got 2600 mAh powerbank for Pi and it manages to stay for some time for my use..But i want to avoid wrong shutdowns due to power failures so .. Which will be the best way to avoid power failure ...
Rohit Karadkar's user avatar
12 votes
9 answers
16k views

What is the highest voltage from the power supply a Raspberry Pi 3 B can handle without getting damaged?

I am using Android things on Raspberry Pi 3 B with a 7-inch touch screen. Currently, I always see a yellow thunder bolt sign on the screen which means that the Raspberry Pi isn't receiving a high ...
Mena's user avatar
  • 237
11 votes
4 answers
20k views

Why am I getting a rainbow screen and flashing red PWR LED with a new Raspberry Pi 3B+?

I think there might be a problem with my new Pi. I'm using the same power supply (purchased from PiHut for my previous 3B) in the new 3B+ but I get the rainbow screen and the red power light flashes ...
Shawson's user avatar
  • 213
11 votes
5 answers
40k views

Can Rpi4B power external / portable USB HDD / SSD?

I was not able to power an external HD directly from a Raspberry pi 3 (the HD was constantly complaining about a lack of power). Would a Raspberry Pi 4 be able to power a portable hard drive (using ...
raspberry's user avatar
  • 111
11 votes
3 answers
10k views

Can I use the 3.3v pin instead of the 5v pin?

I am using a HC-SR04 ultrasonic sensors, and I don't have enough 5V pins on a Raspberry Pi, and I don't want to buy an expander. So is it possible to use the 3.3V pins on some of the sensors? What ...
Stephanie's user avatar
  • 113
11 votes
2 answers
24k views

What are the max current rating for 3.3v and 5v rail of the Rpi 4B

Does anybody know the max current rating of the 3.3v and 5 v rail of the new raspberry pi 4? i could not seem to find anybody benchmark this, i have read from someone that the new RPI 4 has a new ...
Jack's user avatar
  • 686
10 votes
4 answers
12k views

Shorted 3.3v + 5v together. Is it possible to repair?

I was reading through some instructions on how to add a power off/on button to the Pi and accidentally misread instructions and shorted the two end pins on a 3+B model, which appear to be 3.3v and 5v. ...
Elijah Lynn's user avatar
10 votes
3 answers
11k views

RPi 3 - Reduce power consumption

I am looking to reduce the power consumption to a minimum on my RPi 3. For my project, the Raspberry Pi Zero is not an option. for now, I disabled Bluetooth and WiFi and made sure to kill some ...
Senseh B's user avatar
  • 203
10 votes
2 answers
15k views

Battery Power Requirements

Is this Maplin Power Bank 4000mAh pwerful enough to power the Pi with all of the peripherals below? This is useful as I cannot order online, and it is currently £15. I have a Raspberry Pi Model B, ...
Wilf's user avatar
  • 2,523
10 votes
2 answers
4k views

Is there any point to a 2.0A (or greater) power supply, given the 1.1A polyfuse?

My question: it's my understanding, based on the official Raspberry Pi FAQ, the wiki, and numerous forum threads on Stackexchange and elsewhere, that the Raspberry Pi has a 1.1A polyfuse on the micro-...
user14384's user avatar
  • 101
10 votes
1 answer
12k views

How to make a simple, reliable 15-second UPS for shutdown?

Use case: On power loss, the pi is to gracefully close all I/O (already kept to a minimum) and shut down, to be manually rebooted later. A supercapacitor works (I think; not sure of voltage near the ...
kaay's user avatar
  • 251
10 votes
1 answer
2k views

How to remotely reboot halted Pi

I'm thinking of building an array of Pis but I'd like an intelligent method of powering them, i.e., I would like power to each to be controllable via USB. I like the USB GPIO Module suggestion given ...
hfaran's user avatar
  • 201
10 votes
1 answer
2k views

Raspberry Pi Won't Boot

I have tried multiple operating systems... Raspbian Debian OpenElec Raspbmc Two different SD cards... Sandisk 2gb BE1210021871G Sandisk 4gb And two different Raspberry Pis. I cannot get any ...
h00j's user avatar
  • 473
9 votes
2 answers
41k views

Is this idle temperature normal for the RPi 3?

I've just setup a raspberry pi 3 and found out that, on idle, the temperature is about 48 C (measured with vcgencmd measure_temp). On a raspberry pi B+ with the same enclosure and in the same ...
Matteo's user avatar
  • 463
9 votes
5 answers
9k views

Does the Raspberry Pi 3 regulate the voltage on its 5V pins?

I need to supply 5v analog power to an adc. I am supplying the pi with Li-ion batteries, so the voltage falls over time, but does remain within range of the pi's required input. If the input voltage ...
RPGuest's user avatar
  • 99
9 votes
5 answers
2k views

UPS for raspberry pi

I want to be able to power my pi like a smartphone (ie from battery or from mains (while charging the battery), hot swappable) I know there are boards like the MoPi that achieve this, but the ...
JacquesL's user avatar
8 votes
3 answers
6k views

Does Raspberry Pi Zero have a polyfuse?

The question says it all. If you have a definite answer, it would be great if you could post a photo of the pi zero, where the fuse is pointed out.
Stowoda's user avatar
  • 446
8 votes
2 answers
14k views

How to make a high powered USB hard drive work with the Pi?

I tried directly connecting my WD My Passport Ultra 1TB USB hard drive to the Pi but it draws too much power, and it doesn't even run the OS. Is there any way to connect it without damaging the Pi?
Anderson Reyes's user avatar
8 votes
2 answers
8k views

How long can a RaspberryPi run for on 4 or more AA batteries?

I'm looking to power my Raspberry Pi via rechargeable batteries, but I would like to know how long can it run with x number of batteries. I want to eventually be able to mount it outside and solar ...
Patoshi パトシ's user avatar
8 votes
2 answers
12k views

Starting Pi 4 with global_en

It seems that those pins can be used to start Pi 4, but I am not sure exactly how. Can a Pi 4 start after having been shut down by the shutdown menu, if I connect the two holes like below for a short ...
Damn Vegetables's user avatar
8 votes
2 answers
32k views

Check power usage of pi via terminal

How can I see what the power consumption and/or distribution of my pi is via terminal? I can only connect to the pi in question via ssh. So I can't see the "lightning bolt". I am concerned about ...
Qntn Yvrny's user avatar
8 votes
2 answers
646 views

Holding the PI in reset?

Is it safe to hold the pi in reset (via run/p5) indefinitely? If so, will it save on power consumption?
Alexander M's user avatar
8 votes
1 answer
50k views

How to achieve Low Power Consumption on Raspberry Pi via Software and Hardware control [duplicate]

Would like to enquire if anyone could list any/or all possible ways to achieve low power consumption on the raspberry pi. I have found that one could disable the USB ports of the raspberry pi . ...
peekaboo's user avatar

1
2 3 4 5
19