Solar panels must be cleaned regularly. If your home is in a filthy region or close to the desert, they should be hosed weekly. Regardless of air born dirt and dust, you should do a through cleaning every couple months. Clean solar panels are productive solar panels.
See how to test your solar panel for open voltage and current reading. Results will vary depending on sun strength, time of day, angle of light and temperature.
Every day there are people all over who introduce solar energy sources into their lives. The above article should help you figure out if this is the best option for you. Combine the advice here with some diligent research. That should help you come up with a plan that works for you.