Thanks Ryan! Great resources. I did order a similar starter kit from:
http://www.seeedstudio.com/depot/ardx-the-starter-kit-for-arduino-p-1153.html?cPath=138
Working through the modules help build a little confidence, but the guide and code comments lacked a sufficient explanation for my low level. I'll check out your link.
Running a solar power system sounds like where it's at. Kudos! I hope to be experimenting with that soon. I thought about a DC pump that can be adjusted, but I worry about it loosing power and having to occasionally tune it to meet a constant flow rate. I have found some valves that will self adjust. Haven't tried them yet. But I will share the results.
To be continued...