Solar energy hobbyist here: Figure: 1000 Watts of pure solar energy per square meter. [1] 20% efficiency from a typical panel [2] Panel area appears to be rough

Solar energy hobbyist here: Figure: 1000 Watts of pure solar energy per square meter. [1] 20% efficiency from a typical panel [2] Panel area appears to be roughly 4 x (24cm*36cm) = .35 m^2 so energy received is about 69 Watts. Conversion loss is hard to say, but it's DC to DC so, I would expect efficiencies of at least 90%, so derate the 69 Watts to 62 Watts. There aren't any specs on this computer's power consumption, but for what it's worth, typical Apple power supplies come in 60, 85 and 100 Watts, IIRC. So this would be roughly like charging with a small mac power supply... depending on battery size, count on about 1-2 hours of charge. Caveats: this may be kind of thick, heavy and fragile. Also, during the time interval of 1-2 hours, the sun's position will change quite a bit. Panels work best when they're aimed directly at the sun, so if they can be tilted somehow that would be best. It will also need a way to protect the panels from scratches when folded. Demo picture is fake picture. [1] http://en.wikipedia.org/wiki/Sunlight http://en.wikipedia.org/wiki/Sunlight [2] http://en.wikipedia.org/wiki/Solar_cell_efficiency http://en.wikipedia.org/wiki/Solar_cell_efficiency