I've been watching Project Curacao for some time on switchdoc.com (and a bunch of articles in The MagPi magazine) and looking at the solar power system he has been using. I've enjoyed the ups and downs and disasters.
I now see that he has launched a kickstarter to sell the solar controller system he is using with some additional features (sun tracking, phone charging and arduino/raspberry pi support). I'm going to get one for my next solar project.
The kickstarter link is: https://www.kickstarter.com/projects/sunair/sunair-solar-power-controller-board-tracker-phone
Randall