If your dog’s been lazy, and has developed the habit of basking in the sun without doing anything all day, I know this DIY-charging solution is what you’ve been waiting for then. Attach the solar panels to your dog's back and let him sit there all day long while you have your phone juiced up all the while. Dubbed the solar dog charger, this 2600mA-charger is the brainchild of Erik Schiegg. It consists of a dog vest laden with solar panel on top. How efficient is that, can be understood from the fact that it’s good enough to charge Erik’s Android phone in no time. The dirt-cheap DIY charger is worth trying yourself, if interested then get home a solar panel and a battery pack.