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Dell, Lenovo Adding Solar Option for PCs
An anonymous reader writes "Lenovo just announced a solar power option for PCs, and Dell is about to do the same, according to Advanced Energy Group. But the solar hardware weights 86 pounds and costs $1,300! Lenovo officials admit they had to do this to reach the 75% mark to gain EPEAT Gold status; Dell couldn't be reached for comment. Hopefully the technology will get smaller and more affordable."
Solar laptop solutions are sold by many companies already. You can get it as a foldable panel, panels on laptop bags, panels that can be glued to the back of the screen (probably suboptimal), and even a solar jacket
They're available in all sorts, from cheap ones that can only slowly charge the battery (though they seem to be able to provide part of the required power while the laptop is on, extending the battery's life), to more expensive ones that produce enough power to keep the laptop on, assuming favorable light levels of course.
Build your own for around $300: http://www.energyrefuge.com/how-to/solar_power_generator.htm
This is essentially the same thing: a solar panel, battery charger, deep-cycle battery, and (optionally if you don't have a 12V laptop adaptor) a power inverter. The solar cell is what costs the most. The battery is what weighs the most.