We received some great entries, but the winning hack shows us how to build an Arduino-controlled ... so he decided to run it using solar power. A standard solar panel and battery provide power ...

These awesome little home-made magnetic solar panels! [Christian Pedersen] has just published a guide on how to make these handy little solar panels, and they only cost about $1.25 each!

[Carl] recently upgraded his home with a solar panel system ... He managed to build his own monitor using an Arduino. The trick of this build has to do with how the system works.