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People who are trekking in the wilderness, stranded at disaster sites or living in developing nations all have one thing in common – lack of access to an electrical infrastructure. Solar charging devices such as the Solio, iCharge and Joos Orange have been designed to meet the needs of some or all of these groups. One of the latest such systems, Horizon Fuel Cell Technologies’ Sunbox USB 3.0, is particularly versatile.

The Sunbox gathers solar energy through a 1.8-watt waterproof photovoltaic panel. Whenever the sun is shining, that panel automatically starts charging the power system module, via a 3-meter (9.8-foot) cable. That module incorporates a 6-volt 3,000 milliampere-hour battery, two USB ports, and an LCD screen that displays the battery’s level of charge. A full charge requires 6 to 10 hours of sunlight. (more…)