[TriEmbed] Backup Power for Raspberry Pi 2

[pete@soper.us]

This phone/tablet thing seems ideal for a five volt device.
I had an old UPS lying around and used that with 12 and five volt wall warts for my house Samba server running on an Odroid C1 with a big but power efficient disk drive. It's run perfectly for three months now, and uses 1/30th as much power as the system it replaced (which is awakened once a day to rsync the shared files to a RAID volume). Except I failed to measure the power lost in the UPS itself. Will do that when I get back to town.

Pete

----- Reply message -----
From: "Rodney Radford via TriEmbed" <triembed at triembed.org>
To: "Carl Nobile" <carl.nobile at gmail.com>
Cc: "Triangle Embedded Computing Discussion" <triembed at triembed.org>
Subject: [TriEmbed] Backup Power for Raspberry Pi 2
Date: Wed, Jul 15, 2015 11:19 AM

Power the RPi via the micro-USB plug from an external phone battery charger like this one:
http://www.amazon.com/EasyAcc%C2%AE-Portable-External-Motorola-Smartphone/dp/B00JFTCCB2/ref=sr_1_6?ie=UTF8&qid=1436973362&sr=8-6&keywords=5000+mah+portable+phone+battery

There are many different sizes of those, with different features and different power capabilities, but the nice part about this is you can always keep it on the charger, so your RPi is powered through it, and if you lose AC power, it will still run.

I used a 5000mah one of these to run an RPi, external web camera, arduino, and a couple I2C sensors in a balloon for over 5 hours.  Depending on what load you have, your mileage may vary, but I typically consider 1000mah is equivalent to one hour of use.

Another great feature of this is your RPi can now be portable to carry with you to a meeting to show off something without having to plug it in.

On Wed, Jul 15, 2015 at 10:59 AM, Carl Nobile via TriEmbed <triembed at triembed.org> wrote:
Dwight,

Both John's and Glen's suggestions will work, but as Glen suggested you'll need a regulated supply between the power supplies and the RPi 2 to bring the voltage down to 5V. The RPi can not be run on more that 5VDC or expect to see smoke from the RPi

Carl



On Wed, Jul 15, 2015 at 10:52 AM, Glen Smith via TriEmbed <triembed at triembed.org> wrote:
Dwight, 
I have a spare small (ish) ups that came with an old AT&T network modem. It outputs 12vdc, so it's higher than what you need, off the top of my head I don't know what the max input voltage is on the Pi. A DC to DC converter will bring it down to where you want it though. 

I kept it planning to do something like this myself, but 2 years in I still am just moving it around. 
Glen


On Wed, Jul 15, 2015, 10:13 AM Dwight Morgan via TriEmbed <triembed at triembed.org> wrote:

Hi All: I need a backup power supply for my Raspberry Pi 2. I don’t think I need something as large as those made for PCs. I think one more in line with that D cell powered one in my alarm clock or a little larger would work fine.  Anybody know how to make one or if there is one out there already? Feedback appreciated! Thanks! Dwight 

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