Check with your local power company as to whether they have a program to buy excess electricity collected by your solar panels. Some utility companies will give homeowners credits to apply to any energy provided to them. These programs are becoming more available as more and more people install solar panels on their home.
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You should always have a lease transfer option if you lease the solar energy system versus purchasing it outright. If your home is sold, you will need to have this option handy. If you can transfer it to the new owners, you'll be fine.
If you have a pool, don't even think of heating it any other way than solar! This is easily the most efficient use of solar power there is and it will save you a bundle. Solar heating systems cost about the same or less than conventional systems and basically operate themselves so stop wasting your money doing it the old-fashioned way!