I've built three emergency boxes to meet different needs, from a home user who just wants to keep their phone charged to a municipal government or educational institution that needs to maintain strategic links between multiple areas of a city or campus. The Tiny Box is for keeping one or two phones safe, charged, and dry. The Small Box is a slightly larger box, with a massive 12000mAh battery and 4 USB ports, great for charging your entire family's phones, or powering devices such as a Raspberry Pi or mini router for a whole day without recharging. The Big Box is a file-sized box, designed to be a standalone solar system. The huge 20 Amp Hour battery combined with a 30 Watt Solar Panel can keep a modem and router powered even when grid electricity is down. This can be life saving, and in the case of Hurricane Sandy, many users would still have had Internet access at home if they had a system like this! For municipalities, schools, governments, and corporations, this can also be an excellent emergency communication tool, allowing everyone to keep their phones charged and communicating over Wi-Fi.