If you're thinking about installing solar panels to generate your own electricity, make sure that the roof you'll be installing them on gets plenty of good sunlight. Good sunlight occurs between 9am and 3pm. You'll generate the most electricity if your roof receives full, exposed sunlight between those hours every day.
A sun tracker will increase your ability to capture solar energy. Through the tracker, your panels will constantly adjust to maintain maximum exposure to the sun. Though they cost more than fixed panels, the boost in energy production makes them worthwhile.