Apple recently awarded patent "Portable devices having multiple power interfaces," that describes solutions for charging a variety of devices (including laptops, tablet devices or mobile phones) via solar power. The patent was originally filed in the Q1 of 2009.
From the general description of the actual patent:
Portable devices having multiple power interfaces are described herein. According to one embodiment of the invention, a portable electronic device includes, but is not limited to, a processor, a memory coupled to the processor for storing instructions, when executed from the memory, cause the processor to perform one or more functions, a battery coupled to provide power to the processor and the memory, and a battery charging manager coupled to charge the battery using power derived from a plurality of power sources including a solar power source. Other methods and apparatuses are also described.