Questions tagged [power-supply]

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

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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 ...
71
votes
3answers
109k 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)?
5
votes
2answers
9k views

Networks drops, and freezes

Yesterday I've received my Raspberry Pi, and there are some issues I can't get rid of... After a few minutes (3-4 minutes to be exact) of seemingly error free work session through SSH, the network ...
5
votes
4answers
8k views

Powered hubs, backfeeding and safety

I've got my RPi set up as a media centre, running Raspbmc, using a powered hub to run a bunch of peripherals including terabyte external HD and a hacked-together IR remote. All very nice, but it's ...
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 ...
4
votes
1answer
1k views

Power issues with 2 external hard drives connected

I'm using the B model pi which has two usb ports. I originally had 1 1TB external usb hard drive connected to it and then tried to add another 1TB drive and it seemed like that one would not power ...
3
votes
4answers
11k views

High Power USB Power Hub

I currently have four raspberry pi's connected via ethernet to each other. They are currently powered by four 1A power adapters which works fine. But I was wondering if there are any devices out there ...
1
vote
3answers
289 views

Peripheral power from battery

I'm having trouble powering my pi from 12v 2a battery. I made a circuit using 1117 linear regulator, it's supposed to give 1a current and 5v. Pi powers on normally but any peripherals that I connect ...
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 ...
4
votes
2answers
4k views

one power supply for raspberry pi and external HDD

I have my Pi and a USB powered external hard disk. I am looking for a way just to have one plug for the both of them. At the moment my Kindle Charger doesn't have adequate power to power them both. ...
3
votes
3answers
7k views

DIY External Powered USB hub not working

I have put together a DIY External Powered USB Hub by following the instructions. (Instructables, htc-linux) USB hub with 4 ports 5v 2A AC/DC power supply (It varies when tested with multimeter, 5.3 ...
3
votes
2answers
2k views

RPi rev 2 and USB powered harddrive

I am getting my RasperryPi Rev2 soon, and I plan to use it as a media centre. I have a WesternDigital Elements 1TB USB3 2.5" USB powered external harddrive. I know that a normal USB port outputs 500mA,...
1
vote
0answers
52 views

Would a Compaq Presario V6000 laptop monitor be just fine for the RPi? [duplicate]

Possible Duplicate: Connect Pi to an old laptop screen My Compaq Presario V6000 laptop just had an HDD failure and I took it apart and salvaged the monitor. I was wondering if I could use the ...
2
votes
1answer
489 views

What is the quality of the 5V supply on the GPIO

I measured on the 5V pin to the ground and got stunned over the variance that I saw. First I had a Powered USB hub where my devices where attach and so the Raspberry. I just decided to remove my main ...
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 ...
3
votes
1answer
1k views

Dual Power Supplies (Redundant/Spare/Backup)

I have two separate power feeds presented as either two IEC C13 or two UK 3 Pin sockets (the choice is mine). I would like to connect my Pi to both power feeds so that if one power feed fails, the Pi ...
5
votes
3answers
10k views

Maximum amperage on power supply? [duplicate]

Possible Duplicate: Can I feed the device with a current higher than 1A? I've checked the RS and Element14 power supplies: 5V 1A. I've read a few posts here on power supplies and seen people use ...
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 ...
1
vote
5answers
2k views

Not getting enough volts - is the problem the power supply or the pi itself?

I've been having trouble getting my Raspberry Pi to work, and I found out that the power supply I was using had only been supplying 4 volts (give or take half a volt). I bought this one from Adafruit, ...
1
vote
1answer
1k views

When connecting to ethernet it's shutting down/crashing

A few days ago I connected my Raspberry Pi to my screen and I did some work directly on it (without GUI, thus only command line) and suddenly it crashed / shutdown. The red light is on all the time. ...
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 ...
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) ...
10
votes
1answer
2k views

If I power my Pi from GPIO, can I detect that it's not being powered by USB?

I'd like to create a backup power solution for my Raspberry Pi, and I'd like a notification to come up that the Raspberry Pi is running on this backup power. This notification has to tell me that ...
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?
8
votes
3answers
3k views

Can I use an Amazon Kindle Fire power supply?

So i have a spare Kindle Fire power adapter: it's quoted as 5V @ 1.8A. I haven't tried as I don't really want to risk blowing it up!
3
votes
2answers
741 views

Trouble powering pi from batteries

I have an 8-cell NiMH battery pack (10V) connected to a UBEC voltage regulator, so that it provides a constant 5V as the batteries discharge. This is wired to the micro-USB connector that's connected ...
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. ...
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 ...
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 ?
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 ...
7
votes
2answers
10k views

Will router's USB port supply enough power for the Raspberry Pi?

I'd like to use the Raspberry Pi as a small server. My Linksys WRT610N router has a rear USB port and I'd like to use it to supply power to the Raspi. That way, the Raspi doesn't need to have a ...
5
votes
4answers
4k views

What to do about all the wall warts (AC/DC Adaptor bricks)?

While having nice little single-purpose machines is great, I have a proliferation of wall warts now which is becoming untenable. Between a router and an ethernet switch and a HDMI switch and a USB ...
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 ...
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 ...
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 ...
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 ...
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 ...
6
votes
2answers
7k views

Fixing issues with Powered USB Hub

With my PI I'm trying to use the F4U018 Belkin 7 port hub (yes - the one on the problem list). Its one of three I have around, all of which happen to be on the problem list - I don't want to shell out ...
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 ...
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 ...
4
votes
0answers
132 views

Can I leave my Raspberry Pi turned on all the time? [duplicate]

Possible Duplicate: Is it suitable for running continuously, 24/7? I want to maximize the life of my Raspberry Pi, should I try to turn it off when I can or is it ok to just leave it running all ...
243
votes
15answers
536k 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?
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?
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 ...
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)?
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 ...
4
votes
0answers
93 views

Is there any reason why a powered USB hub that provides 700mA couldn't power a RP? [duplicate]

Possible Duplicate: Powering from a non-dedicated power source The Quick Start Guide says: Micro USB power supply – make sure you use a good quality one, capable of providing at least 700mA ...
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 ...
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?