While it may seem that your solar panels are always affixed to your roof permanently, the best ones permit repositioning of the angles. Fixed angle panels are just not that efficient.
Los Angeles Times reporter Susan Carpenter shows the equipment and costs involved with charging an electric car using home solar panels.
Don't assume that you have to live in the desert to use solar panels on your roof. If your roof expanse gets a minimum of five hours of direct sunlight on an average day, there is likely a solar panel installation that can generate electricity for your home or building.