Raspberry Pi Forums

So I have a pi for home purposes, and I want it to be able to survive a power loss.
I also have a spare anker 10000mah battery. A while ago I contacted Anker and they said that one could, but should not daisy chain charge with them (i.e dont have a wall wart powering the Anker and then the Anker powering a device) as it doesn't have pass-through and so the batteries are continually charging/discharging

So the solution I dreamed up was the following
Get a wall wart with two USB sockets
Get a cable such as this (Y cable with 2xUSB A and 1x USB micro) http://www.netstoredirect.com/startech- ... 0wod9-ACFw
Get a normal USB Micro cable

Plug the normal micro cable from wart socket 1 to the Anker
Plug one USB A from the Y cable into the remaining wall socket
Plug the other USB A from the Y cable into the Anker
Plug the UBS Micro from the Y cable into the Pi

Would this work or would the Pi just simultaneously take power from the wall and the Anker, thus defeating the whole point?

I would not recommend this with consumer power supplies. Two concerns.. due to differences in the supplies you don't know which will feed more or less power. Second, one supply may end up backfeeding the other and potentially cause lots of problems such as overheating and fire. You can engineer such a circuit from scratch, picking suitable power supplies, diodes, etc.. but picking off the shelf consumer supplies and tying them together is generally just trouble.

Search for 'diode OR' power supply on the internet, for similar circuits. You basically put two power supplies behind diodes, with one supply having a higher voltage then the other. It supplies power most of the time, until it fails or gets overloaded then the other takes over.

Regards,
-Moses

Harvs wrote:So I have a pi for home purposes, and I want it to be able to survive a power loss.
I also have a spare anker 10000mah battery. A while ago I contacted Anker and they said that one could, but should not daisy chain charge with them (i.e dont have a wall wart powering the Anker and then the Anker powering a device) as it doesn't have pass-through and so the batteries are continually charging/discharging

So the solution I dreamed up was the following
Get a wall wart with two USB sockets
Get a cable such as this (Y cable with 2xUSB A and 1x USB micro) http://www.netstoredirect.com/startech- ... 0wod9-ACFw
Get a normal USB Micro cable

Plug the normal micro cable from wart socket 1 to the Anker
Plug one USB A from the Y cable into the remaining wall socket
Plug the other USB A from the Y cable into the Anker
Plug the UBS Micro from the Y cable into the Pi

Would this work or would the Pi just simultaneously take power from the wall and the Anker, thus defeating the whole point?

Unnecessary poll removed.....