Get the records from your energy company on how much energy you have used in the last five years. You can then use this information to figure out exactly how much power you will need solar energy to provide for you home. Having the past five years is important so that you can see that some years you will need more energy than others.
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Get quotes from several contractors before signing any solar energy installation company. Just as with any other construction product, it pays to shop around before you commit to a particular company. Check out their reviews online and their standing with the Better Business Bureau. A little research ahead of time can save you a big headache later.