2 parter, maybe, Solar Panel Car Battery Charger + a Card based PC capable of replacing desktop .....
http://www.aliexpress.com/store/product/Mass-Manufactured-OctaCore-ARM-Cortex-A15-A7-Allwinner-A80-Android-4-4-Board/1021496_2015735541.html
OS: Android 4.4.2 or linux3.4.39 with 80 Cores (16 CPU+64 GPU) 2gb rom 8gb ram, all the bits ...
$169 ...
and stick another with FreeNAS + 64GB SD as web/email server, with a router with Wifi, to collect updates etc ...
Those Card based PC have low power req, and Gigabit lan, WIFI, Bluetooth, & probably will fit in a small AussiePost Express Post Bag/Envelope ....
PS.. I boot WIN7 partition on this PC as a VM, If I am desperate to die of update boredom .....