It is a good idea to tie your solar panels system back into the grid. With this type of system, you can sell excess energy to your power company. This will help pay for the installation of your system and even allow you to make a profit on your wise investment.
Find out what kind of warranty comes with any system you are considering. A solar energy system should last you for at least twenty years, so be sure the company you are dealing with can support it. If there is no warranty, or an extremely limited one, it may be time to keep looking, no matter how great the savings are.