I put together a solar system at my cabin which has no connections to the outside world (internet or hydro)
I needed a (low power) way to view the state and history of my solar system, so I created this app that monitors a Midnite Solar charge controller using the modbus TCP interface and an Outback Inverter using a serial interface and displays a web status page using an embedded web server
http://netduinosolar.codeplex.com/