Patrick from Will Blog for Experience has put together a very impressive how-to post on building your own solar charger that is powerful enough to charge a Macbook in five hours (even in Chicago). The post not only details where he ordered the parts but also gives different options, weights and price points. You can even go with a bulkier power pack option that includes a flashlight and radio, the smaller model that Patrick used for his setup also includes two very useful usb ports for universal charging.
Portable Solar Power for $180 @ Will Blog for Experience
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