In June 2012 we launched a Raspberry Pi solar data logger and it has been running continuously uploading data from our sensors to our online reporting site at home.briandorey.com every 60 seconds.
Home screen from the data logger website
In November 2015 we upgraded our solar data logger with a new version which combines all the previous sensors onto a single PCB and is powered by a Raspberry Pi.
There are two blog posts with details of the new Raspberry Pi data logger
http://www.briandorey.com/post/Raspberry-Pi-Solar-Data-Logger-Version-2 and http://www.briandorey.com/post/Nest-and-Solar-Logger-Update