Know when your clothes are dry
Monitor real power, voltage, current and power factor using the Sparkfun Blynk board and view live graphs in the Blynk App.
Use Tracer MPPT (and others) controller's RS485 data link to generate cool statistics live on your phone.
Gutters to Gardens is a solar powered rain barrel for remotely or automatically activating a water distribution system for home garden beds.
The idea is to basically monitor our rooms continuously and if no one is present in the room, the system will turn off the lights and fans.