After the recent series of blizzards caused so many power outages, I've been wondering about solar charging my iPad 4 in an emergency. Is there any product that works? I've looked at the GoalZero Portable Solar system with the Nomad 7 solar panel and the Guide 10+ battery pack. But from what I can tell from various reviewers it may not work in a useful manner for an iPad (one reviewer on Amazon.com essentially said that he believed he'd need to live at a sunny beach to get a decent charge and that, even then, it wouldn't handle a tablet.).
Has anybody had any luck with the GoalZero or any other solar charger on an iPad 3 or 4? Thanks.