Crazy8
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Powering Multiple Pi's

Thu Jul 30, 2015 8:25 pm

I plan on having multiple Pi's and they will all be sitting together on a bench. I have a 12v 25A power supply that I use for ham radio stuff, but I would like to see if I could power my Pi's from it. I know that the Pi's only need 5v 1-2A, but is there a way I would be able to utilize this power supply to power the Pi's?

If not, what options do I have other than buying each one of them their own wall-wart?

Here is what mine looks like. http://www.amazon.com/Radio-13-8vdc-Swi ... B010YAAFGO

Thanks in advance for the help.

riataman
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Location: Monterrey, Mexico

Re: Powering Multiple Pi's

Thu Jul 30, 2015 8:44 pm

You might be able to use a computer PSU. Those already output the required 5V and you can draw high current from them. As an added bonus they also give 3V3 and 12V in case you want to connect additional stuff.

Crazy8
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Re: Powering Multiple Pi's

Thu Jul 30, 2015 8:47 pm

I have thought about that, especially as a workbench PSU. Might try to find a small form factor PC power supply to do this with. Would be cool if I could power 5+ Pi's off the PC PSU 5v power. Suppose the big thing's going to be how many amps are coming of that 5v line.

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mikronauts
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Re: Powering Multiple Pi's

Thu Jul 30, 2015 8:52 pm

I often use inexpensive DC-DC converters that take 7-24V in, and output 5V at up to 3A - they work great.
Crazy8 wrote:I plan on having multiple Pi's and they will all be sitting together on a bench. I have a 12v 25A power supply that I use for ham radio stuff, but I would like to see if I could power my Pi's from it. I know that the Pi's only need 5v 1-2A, but is there a way I would be able to utilize this power supply to power the Pi's?

If not, what options do I have other than buying each one of them their own wall-wart?

Here is what mine looks like. http://www.amazon.com/Radio-13-8vdc-Swi ... B010YAAFGO

Thanks in advance for the help.
http://Mikronauts.com - home of EZasPi, RoboPi, Pi Rtc Dio and Pi Jumper @Mikronauts on Twitter
Advanced Robotics, I/O expansion and prototyping boards for the Raspberry Pi

riataman
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Re: Powering Multiple Pi's

Thu Jul 30, 2015 8:53 pm

This was the first ElCheapo power supply that I found: http://www.newegg.ca/Product/Product.as ... -_-Product

It claims that it can do 22A on the 5V rail. The recommended power supply for RBP2 is 1.8A. So that PSU should be good for about a dozen Pis.

Crazy8
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Re: Powering Multiple Pi's

Thu Jul 30, 2015 9:18 pm

mikronauts wrote:I often use inexpensive DC-DC converters that take 7-24V in, and output 5V at up to 3A - they work great.
Any that you recommend or could point me towards? :) I'm curious to take a look at these as a possible option.

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mikronauts
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Re: Powering Multiple Pi's

Thu Jul 30, 2015 11:49 pm

I've purchased many other items from Adafruit before, with excellent results, so I suspect this is a good item

https://www.adafruit.com/product/1385

Never purchased from these guys, but it is cheaper

http://www.ebay.com/itm/5-KIS3R33S-5V-U ... 35eb000eef

Crazy8 wrote:
mikronauts wrote:I often use inexpensive DC-DC converters that take 7-24V in, and output 5V at up to 3A - they work great.
Any that you recommend or could point me towards? :) I'm curious to take a look at these as a possible option.
http://Mikronauts.com - home of EZasPi, RoboPi, Pi Rtc Dio and Pi Jumper @Mikronauts on Twitter
Advanced Robotics, I/O expansion and prototyping boards for the Raspberry Pi

Crazy8
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Re: Powering Multiple Pi's

Fri Jul 31, 2015 3:36 am

mikronauts wrote:I've purchased many other items from Adafruit before, with excellent results, so I suspect this is a good item

https://www.adafruit.com/product/1385

Never purchased from these guys, but it is cheaper

http://www.ebay.com/itm/5-KIS3R33S-5V-U ... 35eb000eef
So...stupid question. If I were to do something like those 5 USB on that ebay link, I know the terminals would go to the PSU, so for the USB I suppose I would just use a regular USB cable that has a micro USB end to supply the power?

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mikronauts
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Re: Powering Multiple Pi's

Fri Jul 31, 2015 4:19 am

yes
Crazy8 wrote:
mikronauts wrote:I've purchased many other items from Adafruit before, with excellent results, so I suspect this is a good item

https://www.adafruit.com/product/1385

Never purchased from these guys, but it is cheaper

http://www.ebay.com/itm/5-KIS3R33S-5V-U ... 35eb000eef
So...stupid question. If I were to do something like those 5 USB on that ebay link, I know the terminals would go to the PSU, so for the USB I suppose I would just use a regular USB cable that has a micro USB end to supply the power?
http://Mikronauts.com - home of EZasPi, RoboPi, Pi Rtc Dio and Pi Jumper @Mikronauts on Twitter
Advanced Robotics, I/O expansion and prototyping boards for the Raspberry Pi

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davidcoton
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Re: Powering Multiple Pi's

Fri Jul 31, 2015 8:18 am

mikronauts wrote:yes
Try to make sure the USB cables are good quality (thicker wires) and only as long as they need to be. The aim is to minimise the voltage drop on the cable.
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henryhanselscott
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Re: Powering Multiple Pi's

Fri Jul 31, 2015 11:00 am

I have used these with very good results:

http://www.ebay.com/itm/New-Mini-5pcs-L ... 43d6263c03

One word of caution, out of a batch of 5 I had one that the capacitor exploded on me. The metal top came off with such force that it struck the ceiling of my shop and dented the can nearly flat. It sounded like a gun going off. So now, when I first power one up for the first time I always wear safety glasses. Other than that one, I have had these in use for several months and the pi is very happy with the output. You could use these with your 12 volt supply.

Henry

timrowledge
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Re: Powering Multiple Pi's

Fri Jul 31, 2015 5:13 pm

I have two different setups for powering my Pis-
- some have SupTronics X series boards attached, which have (amongst a bunch of other goodies) a DC barrel connector that lets you feed 5-12V in, and I have a 12v/15A power supply originally intended for running model plane chargers feeding them.
- others are run via USB from an Anker 6-port 60w USB charger (http://www.amazon.com/Anker-PowerPort-C ... B00P936188) with 12" usb cables.
Making Smalltalk on ARM since 1986; making your Scratch better since 2012

hampi
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Re: Powering Multiple Pi's

Fri Jul 31, 2015 5:20 pm


Crazy8
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Re: Powering Multiple Pi's

Mon Aug 03, 2015 9:44 pm

Awesome! Thanks for all of the replies. These options should give me something to think about. :)

Bruny
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BladePi: Powering Multiple Pi's

Mon Sep 28, 2015 3:46 pm

Crazy8 wrote:If not, what options do I have other than buying each one of them their own wall-wart?
this may be solution for 2 or 4 Pi 8-)

Heater
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Re: Powering Multiple Pi's

Mon Sep 28, 2015 7:27 pm

If you want to power a dozen Pi from a 5v supply capable of delivering a hundred amps I would suggest putting a fuse in line with the supply to each Pi.

Otherwise any little mishap results in a meltdown and/or fire.
Memory in C++ is a leaky abstraction .

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