The last one with the Raspberry Pi is my site. I've just added another whole page doing some of the napkin math regarding efficiencies and power usage. Looks like I'm going to need some more panels and batteries to run reliably!

EDIT: Heres the new section - http://randomcontent.wolfnexus.net/RandomSite/solar-powering-a-raspberry-pi-for-bitcoin-mining/solar-powering-a-raspberry-pi-for-bitcoin-mining-part-2/

Don't think I've made any mistakes in my math, but feel free to correct me if I'm wrong...