VoltsxAmps has a do-it-yourself guide to boosting wifi with a dd-wrt router powered by the sun

Ever wondered what it would be like to have your own hotspot no matter where you went? Well now you can with this portable solar powered Wi-Fi repeater.

This little mod is simply a wifi router connected to 5 AA batteries that is charged with the built in solar panel and all mounted into a little cigar box. I used this in the back window of my car and no matter where I am at I am able to surf the net and check email within 150 feet of my car.

The same site points to a solar powered wireless security camera do-it-yourself project. Combine that with the do-it-yourself surveillance system and you have all you need for surveillance without wires: