My first solar powered boom box, built in 2009 and shown below, was the inspiration for the ZingBox project on Kickstarter. With four 8inch woofers, this 50lb boom box rocks the block. On a nice sunny day of enjoying music outdoors, it will be more charged when you go home than when you started. This original “Port-a-Party” boom box was inspired by sound systems I saw in use at the Roskilde music festival in 2007 and 2008.