Power supplies

4 posts
by MrP » Mon May 28, 2012 8:51 pm
I'm not sure if this is in the right area but.....

I want to power my RPi from a mains powered USB hub and power that hub by something like a Li-ion battery or something along those lines. Is this possible? I've seen several rechargeable power supplies like this battery

http://www.ebay.co.uk/itm/12V-DC-USB-5V ... 4601488952

powering this hub

http://www.ebay.co.uk/itm/High-Speed-HU ... 3a70591021

and then powering the RPi from the hub, I'd also like to use the hub for my keyboard, mouse and hoepfully in the future a USB tft.

Thanks for any help,

Simon (total novice)
Posts: 4
Joined: Mon May 28, 2012 8:43 pm
by normal » Mon May 28, 2012 10:30 pm
I've seen a few photos of people doing exactly that. As has been said the micro USB port doesn't receive data so if you power it with a USB hub also connected to the USB port on the Pi it should be fine, just know that you're out one port that you could be saving using a regular adapter.
Posts: 61
Joined: Sun May 27, 2012 9:50 pm
by MrP » Tue May 29, 2012 10:15 am
Thanks for the feedback, all i need now is a cheap small screen and tiny keyboard/mouse and im sorted. I was thinking what to keet it all in and the first thing that popped to mind was....Spiderman lunchbox.
Posts: 4
Joined: Mon May 28, 2012 8:43 pm
by MrP » Tue May 29, 2012 12:34 pm
Do you think this battery pack supply enough mA's?

http://www.ebay.co.uk/itm/5V-1A-Mobile- ... 5672935927
I've got a 80gb 2.5" IDE in an enclosure running off USB I want to use, so in total I'd have running of the battery supply:-

USB hub
Hard Drive
Possibly a screen
Maybe a wireless dongle

I'm not 100% sure if it will be ok? I'm a total n00b when it comes to electronics so learning as I go along.


Posts: 4
Joined: Mon May 28, 2012 8:43 pm