Um, this assumes that the area around your computer is lit. Will it even work in a room where the brightest thing is the computer monitor? Does it require direct light or is ambient light enough? Those solar powered calculators worked in any room with a window. Seriously what did it cost in time, money, and resources to make the solar cells and is it "better" then the 2-8 batteries per year you guys are guesstimating? I would rather have a wireless non-battery powered mouse then a wireless non-battery powered keyboard, but it sounds a little more challenging.
tdawnaz, nice point! Using solar to power a laptop at your local park sounds great. If it works under a shady tree I'm for it.
Solar panels around 16 square feet produce 150-250 watts. If a single square foot could produce 12 watts, a solar and battery laptop (in full sun lol) could at least provide some of the required power lengthening the battery life at the expense of a sunburn.
My conclusion: It sounds part gimmick, part science experiment. Changing batteries isn't much of an issue, disposing of the chemicals inside the batteries
is. If your that electricity conscious spend a couple thousand dollars on bunch of solar panels, install them on your sun facing roof then let the next 30 years of no electricity bill offset that large initial investment.
The Prior comments are from a resident of San Diego, home to 146 sunny days per year and a summer drought every summer. Sun Map