Questions tagged [power-supply]

The methods for powering the Raspberry Pi (typically via its micro-USB connection.)

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244
votes
15answers
537k views

How do I turn off my Raspberry Pi?

Should I just pull the plug? Or is it best if I exit LXDE and any other running processes first?
132
votes
7answers
27k views

How can I run the Pi on Solar Power?

Has anyone successfully set up their Pi to run on solar power? If so, what would be the cheapest way to sensibly and reliably achieve this, using a combination of solar cells / batteries / voltage ...
103
votes
11answers
138k views

How do I build a UPS-like - battery backup - system?

As we all know, the Raspberry Pi doesn't really use that much power (5v + 700mA is the spec). I'd like to build a battery backup for power outages in a DIY-ish fashion. I don't need surge protection ...
103
votes
9answers
261k views

How do I supply power through the GPIO?

I have seen some examples of people powering their Raspberry Pis by wiring a DC "barrel plug" style power supply to the 5V and GND GPIO pins. What considerations should be taken when doing something ...
94
votes
14answers
147k views

How can one control AC power (220V) with a Raspberry Pi?

I though about using the Raspberry Pi to switch on and off other electrical devices which unnecessary consume power in stand-by mode. In short, I'd like to control an AC socket or multiple sockets. ...
78
votes
10answers
34k views

What do I need to know to power from batteries?

What voltage range can it accept? What sort of batteries are appropriate?
71
votes
3answers
110k 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)?
66
votes
10answers
121k views

How do I modify my Raspberry Pi to be powered over PoE?

Is it possible to modify the Pi, so that it can receive it's power via Power over Ethernet (PoE)? I would like to be able to power my unit via the ethernet cable, so that I don't have to worry about ...
65
votes
2answers
68k views

Raspberry Pi Power Limitations

There are very many, often contradictory, claims about the power requirements and limitations of the Pi. What are the exact requirements?
48
votes
2answers
112k 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 ...
40
votes
6answers
48k views

What's the current draw and supply voltage tolerance?

What's the current draw when the Raspi is at idle (min), and at 100% CPU/GPU (max)? (With no peripherals/accessories plugged in) What's the minimum and maximum voltage allowed to run the Raspi stably?
36
votes
7answers
30k views

Powering without using the micro USB

Is it possible to power the device without using the micro USB? For example, is it possible to use PoE (Power over Ethernet)?
30
votes
6answers
86k 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 ...
29
votes
5answers
28k views

Circuit to safely power-down Pi

I want to use my Pi as an XBMC server in the car. The XBMC docs say that you should always use the shutdown command before disconnecting the power. I've been thinking that it should be possible to ...
27
votes
7answers
33k 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 ...
27
votes
6answers
82k 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 ...
27
votes
5answers
1k views

Powering from a non-dedicated power source

While the quick start guide says not to power the device from a USB hub or from a computer, the only requirements for power listed are: Micro USB power supply – make sure you use a good quality one,...
23
votes
4answers
26k views

Can I feed the device with a current rating that's higher than what's recommended?

The quick guide says that the power supply for my Raspberry Pi model should provide at least 700mA. How about the upper bound? Is it fine to use a power supply with an high output current, say higher ...
23
votes
5answers
14k views

Power RPi from same Powered USB hub as its Peripherals?

I am putting together all the bits I need to start playing with my Pi, and one question I have is how to power it using the least cables as possible. Given that I have ordered a small mains powered ...
23
votes
5answers
2k views

What do I need to know when choosing a dedicated power supply?

This question asks about what you'd need to know to power a Pi from a non-dedicated power source. It also links to the Quick Start Guide, which says: Micro USB power supply – make sure you use a ...
22
votes
6answers
5k views

What happens if the power supply is 550 mA?

I read that the current should be at least 700 mA. I plugged a power supply with output current of 550 mA, and it seems to work fine. Can something happen to my Raspberry Pi? Does a wrong ...
21
votes
2answers
11k views

Does the power supply need to be exactly 5 volts?

After searching all over my house, all I could find was an LG "Travel Adapter" with an output of 5.1V == 0.7A. Will the extra tenth of a Volt harm the Raspberry Pi?
20
votes
3answers
10k views

Can the USB ports be used to power the Raspberry Pi?

Does the power need to be supplied via the micro USB port or can one of the two normal USB ports be used as well? I intend to use SSH only, so the USB port would not be used in any other way, but I'd ...
20
votes
6answers
47k views

Can the Raspberry Pi power this 2.5" drive without a USB hub?

I want to use my Raspberry Pi model B as a NAS, but I'd like to avoid using a USB hub. I have a 2.5" Western Digital 1 TB USB hard disk drive (this one), and a 2 A power supply for the Raspberry ...
20
votes
2answers
17k views

No HDMI output when HDMI cable is connected after power supply

I've noticed that I don't get any HDMI output to a monitor if I connect the HDMI cable to the Pi after I plug in the power supply, because I have two RPis for one monitor -- one running Raspbmc, the ...
19
votes
7answers
63k views

Undervoltage warning despite decent power supply

I found some related questions about this, yet no answer. Using a freshly bought "5V/2.1A" rated power supply, I get undervoltage warning icon on both my Raspberry Pi 3s. I measure 4.75V at the USB ...
18
votes
4answers
18k views

Current draw for +/2/3/0 models

Essentially "What's the current draw and supply voltage tolerance?" but for newer models.
18
votes
3answers
2k views

Raspberry Pi power source supply

I read that the current should be at least 700mA. can I use HTC Google Nexus One charger as my Raspberry Pi power source supply ?
18
votes
3answers
5k views

Can I power a USB SSD/HDD?

I read the power supply should have 0.7A and that RPi by itself requires around 0.4A-0.5A. So, what if I want to connect an external USB SSD/HDD? External SSD can require 0.5A (and maybe more), so ...
16
votes
8answers
37k views

Can I power Raspberry Pi using the mini USB to USB cable connected to a computer?

My question is quite simple. I'm asking if I can use the power cable you get along with it as a USB power supply. Instead of plugging it to a power socket, can I use the USB to connect directly to my ...
16
votes
2answers
1k views

Safe to power a raspberry pi from a 50W adapter

I have a power adapter that is rated at 50W (5V, 10A output), and I was wondering if it would be safe to run a single pi from it? I am planning on using it for powering more in the future, but would ...
15
votes
4answers
1k views

What are the dangers of connecting the Micro-USB through an adapter straight to the mains?

I have a USB-Mains power adapter for charging up an iPod, which I thought I would use to power my Pi. It looks like this: with USB one side, and Mains the other. I was wondering if there are any ...
15
votes
9answers
69k views

What can I use to power my Raspberry Pi Zero with rechargeable battery?

Is there a 5 V rechargeable battery and cables compatible and comparative in size with Raspberry Pi Zero? I don't want to have to plug my Raspberry Pi in every time and nonrechargables get ...
15
votes
3answers
9k views

Powering from my PC's USB 3.0 port

The specs for my PC's motherboard don't mention any upper or lower limit for its built-in USB 3.0 ports. What is the minimum current that any (standards compliant) built-in USB 3.0 port should be ...
15
votes
3answers
9k views

What's the problem with backfeeding?

New to the Pi, so new in fact that my very first (a B+) hasn't even arrived in the mail yet... I know that "backfeeding" or "backpowering" refers to powering the Raspberry Pi via a powered USB hub ...
15
votes
5answers
2k views

Strategies to deal with unpredictable power supply

I want to install a Pi in my car and use it to record GPS data. What strategies (in my program) can I follow to minimize problems due to power being interrupted when writing to the SD card? So far I ...
13
votes
8answers
7k 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 ...
13
votes
2answers
4k views

Powering Raspberry Pi and other USB devices through a single USB Hub

I bought a powered 7-port USB Hub, which has 7 downstream ports, 1 up stream port and one power port. My question is can I connect both Raspberry Pi and the USB devices that I want to use with ...
13
votes
1answer
2k views

Powered USB hub powering the Pi through USB sockets (not microusb)

I bought a powered USB hub from Maplin, just something cheap, but the guy assured me that it would work fine. Anyway, plugging it into the raspberry pi (with the microusb power lead out of the rPi) ...
13
votes
6answers
11k views

How can I build a power switch?

I would like to be able to have a simple power switch between the RPi and its USB power, such that I don't have to plug and unplug the device to operate it. Is there a simple switch available that I ...
12
votes
6answers
4k views

Powering Raspberry Pi 3 from another Raspberry Pi 3

Is it possible to power a Raspberry Pi 3 directly from another Raspberry Pi 3 that is powered from a Micro USB socket. I understand there is a 5v rail and I am thinking that linking the 5v rails ...
12
votes
4answers
11k views

Can I use a standard PC power supply to power a Raspberry Pi?

Can I use a standard PC power supply to power a Raspberry Pi, e.g. iMicro IM400W 400W ATX12V Power Supply (or just take one from an old unused computer)? Amazingly, these things are sold starting from ...
11
votes
3answers
12k views

Can I power a Pi through a 5V pin?

The PIN mapping of the Raspberry 2B says: The red ones are 5V pins. Are these just used as 5V out pins when power is connected through Micro USB? Or is it also possible to power the Raspberry Pi via ...
11
votes
2answers
35k views

What to know about powered USB hub?

I'm a bit lost in electricity stuff, but I want an USB hub to power supply my Raspberry Pi and my hard drive. I know that there are lists of USB hubs for Raspberry Pi that works perfectly, but I want ...
11
votes
1answer
4k views

What type of micro-USB is used?

From previous experience I've discovered there are quite a few different types of micro-USB connectors. Here are three main ones: I'm pretty sure it's not the middle one; and I think it's the left ...
11
votes
2answers
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-...
10
votes
3answers
3k views

Homebrew Power Supply for Raspberry Pi

I was wondering what precautions I should be taking when I am making a PSU. I managed to find an old dc adapter. These are the parts I currently have. | no | name | specs | |---...
10
votes
2answers
8k views

Dangers of Underpowered Pi?

I'm reading that the lightning bolt in the top right corner of my pi means that it is currently underpowered. I won't be able to get a new cord for a few days and I'm wondering if running under ...
10
votes
4answers
24k views

Powering the raspberry Pi from USB + microUSB, is it safe?

I want to power a Pi model B from a powered USB hub. I got surprised that the Pi powers on with only the USB attached. A little search in the forums confirmed me that it is a working solution. I ...
10
votes
1answer
748 views

Does a two-port charger at 1.5A provide 750mA from each port?

So, I'm looking to buy this energizer charger: http://www.amazon.com/Energizer-Dual-Universal-Charger-Pc2-wa/dp/B004YZI1VW/ref=cm_cr_pr_product_top The 1 port product has 1A the two port product has ...