In times of climatic changes environmentally compatible solutions for lighting in outdoor advertising are more and more important. Solar power is not only a cheap and sustainable solution for billboard lighting in remote locations, it also serves as a good sales argument and could contribute to gain a higher public acceptance of outdoor advertising.
Go to the websites of some solar panel distributors for billboards: http://www.siliconsolar.com
http://www.solarlighting.com
http://www.solarlighting.com