Harbor Freight Solar Battery Charger. The freakin thing WORKS!!
Decide whether you want to be on or off the power grid. Many people look forward to getting "off the grid" when they switch to solar power, however this may not be the best choice. Staying on your power grid means that when you have poor sunlight conditions you have the ability to purchase additional power when you need it. As a bonus, when you produce more power than you use, you can sell the excess back to the utilities.
Do you have a pool? You could save a lot by investing in solar panels. There are small solar energy systems designed to power a water heater or a water pump and since you only use your pool during the warmer months, your panels will work perfectly when you need them.