También he encontrado un módulo de alimentación específico para Raspberry PI:
http://www.ebay.es/itm/Raspberry-Pi-...58528251108511
Use your Pi in the middle of nowhere!
Here is a small unit that will allow your Raspberry Pi to be operated from a battery, solar panel or similar sources of power when connection to a mains electricity supply is not possible or desirable.
This opens up the possibility of using your Pi in the middle of a field if you so wish!
The module is a bare board, like your Raspberry Pi. It comes exactly as in the illustrations, so it is easier to fit into your own custom enclosure if you wish.
As well as converting battery power to the correct voltage for the Pi, it can also be connected directly to a low voltage transformer and convert AC power to the 5 volts DC required.
The unit will convert any voltage between 8 and 30 volts to the 5 volts DC required and can supply up to 2 amps - more than enough for your Pi.
Connection of the power source to the converter is by a high quality screw terminal block, and connection to the Pi is by means of the standard USB 2.0 type A Male to USB 2.0 Micro type B Male cable (NOT supplied).
Note that the module may become very warm during use. This is normal, but care should be taken to place it on a suitable heat resistant and non-conductive surface. As with any electrical item of this type, the module should be located out of reach of unsupervised children.
Specification:
Input: 8v to 30v A.C. or D.C.
Output: 5v D.C.
Max Output Current: 2 Amps
Input Connection: Screw Terminal Block
Output Connection: Standard USB type A Socket
Salud.
