Hi everyone,
First of all I precise that I am a (french) noob with Arduino. So excuse me both for my ignorance and for my English 
I want to use an Arduino Yun for a project that consists in making a little system that allows a user to display a short message on his door.
The user has to fix the system on his door and he can change the message thanks to an application on his computer or his smartphone.
I chose an Arduino Yun to receive the message from the computer by WiFi and transmit it to an e-paper panel.
In those conditions I'd like to know the consumption of my Arduino card to determine how I should power the system (solar cells, battery...)
In fact I want system to be low-power as well as possible.
Thank you in advance for your answer.