The basic details
The basic goal of the Scrobby Solar project is to develop a robot that is able to clean solar panels autonomously. This with an affordable price target (350 euros) and minimal modifications to the system. After comparing some options I chose to work with just rain water for the cleaning actions (no need for a water supply, no frost issues in winter) and a tether based motion system.
A quick intro vid
Despite my video production talents and with some quick help of my sister I've managed to upload a quick introduction video. It shows some of the making process, plus some test runs on my small scale testing setup (which is a lot easier to work on than climb a roof and dance for rain every time I want to test something).