Solar-power system manufacturer Goal Zero has released the Sherpa 50 Portable Recharger and the YETI 1250 Solar Generator —two long-lasting rechargeable, portable power systems. The Sherpa 50 portable recharger weighs only 14 ounces and measures 50 inches on each side. It features a unique "Power Port— that will enable users to charge laptops directly from the recharger, as well as upgraded USB ports that now output 1A of power — enough to provide two extra hours of entertainment on an iPad or tablet device...