Arduino Yun consumption

hi everyone,

first of precise (french) noob arduino. excuse me both ignorance , english 

i want use arduino yun project consists in making little system allows user display short message on door.
the user has fix system on door , can change message application on computer or smartphone.

i chose arduino yun receive message computer wifi , transmit e-paper panel.

in conditions i'd know consumption of arduino card determine how should power system (solar cells, battery...)
in fact want system low-power possible.

thank in advance answer.

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