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FYI, most current solar chargers will work fine with just an ordinary light bulb. Not quickly but they will at least trickle charge. And given that Li-Poly/Li-ION batteries like a lot of smaller frequent charges these make even more sense. So the reader would not need to be left on the window of your car...and I would worry more about heat than someone stealing your device. In the 30+ years I have been driving and owned vehicles, only once was my vehicle broken into and that was one of the few times I actually locked the doors. I pretty much never lock them...not being cavalier but rather it's a self defense thing...I have to actually remove the lock post on my driver door or I will lock my keys in the car fairly often. I get distracted when working or what not and just experienced that "oh crap!!!" sensation as you see your keys sitting on the console or seat has the door clicks...hehehehe...of course I lock it with valuables in there. My uncle was an ATF agent who came up through the ranks starting out as a beat/patrolman in Long Beach way back when and one of the best bits of wisdom he passed on to me is when carrying anything of value the best way to draw attention to it is to make a fuss over protecting it...if you carry a 100k around in a old paper sack from the grocery store and odds are no thief would ever give it a second look, but put your things in an expensive briefcase, wallet or bag of any sort and the odds go up fast that it will draw attention. so will constantly checking if your bag (or whatever) is still where you left it...of course if it's that valuable, don't leave it somewhere...hehehe The logic applies to a variety of situations. I miss him, he taught me a bunch...but at least the info is in there somewhere with a lot of funny stories.
Sorry for meandering OT there but it just triggered what I learned and how it has worked for me. Anyway, a solar charging system would be a very nice and smart addition to an ereading device, but I suspect the real goal is or large signage rather than reading device with likely would use more power per month than a 20'x60' billboard if you think about it...maybe one page refresh per month?? Heck, all of the highway/roadside emergency phones are solar powered using a battery to store the energy. Same basic idea on a different scale.
Yet having a way to charge your reader while say on a camping or backpacking trip would be super...
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