Battery powered mobile appliances have been booming for years. Examples include power tools, laptopcomputers and mobile phones. A photovoltaic power supply makes battery-powered appliances more practical for users,since the batteries don't go flat. The idea of a solar bag for PDAs and mobile phones was born to satisfy energy needs whiletraveling, hiking, climbing, sailing, cruising especially electricity is not available.The success of the photovoltaic power supply is largely determined by lighting conditions: outdoors, a device is exposed tosolar intensities of up to 1000w/m but indoors, under artificial desktop lighting or outdoors during overcast weather, the valuedecreases to 100w/m. The cells should provide close to maximum voltage already for very low illumination and for a verysmall area of cells for cellular phones, laptops and PDAs. These specifications are well met by high-efficiency cellsexceeding 14%-15% efficiency. We have developed a solar charging device for commercially available PDAs, mobilephones and laptops. The charging device consists of a 9-30 solar cell generator connected in string using black on blacktechnology with an area of 5x12 cm and 1.5 watt related power with a low loss charge controller for the Li-Ion battery in thePDAs and mobile phones, and a 33x33 cm 10w power device for the laptops.
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