Don't think the biggest solar panel is the best. There are a lot of variables to consider when buying solar panels. You should consider each of these factors when making your decision.
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Your solar panels should be able to get a maximum amount of light form the sun. If you are set against hiring a professional to assist you, you can start tracking the sun's movements yourself to calculate the best positioning.
The words "solar energy" invoke fear in many people because they do not understand all that it entails. Hopefully, the above article helped you shed a little light on the topic. It may not be the best energy source for you, but you should consider all of the information here when deciding that.