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It's all about percentages. The best solar panels still have just under %50 absorption rates but even at that it's worth it to start installing them. As time goes buy they will get better.
Soon if you cover just the roof of your house you will power everything and have a little left over to put in your electric car.
Panels over the garage will then take care of the car and you'll have some left over energy. I believe this will happen in about 10 years.
Personally I would wait just a few more years before installing this as new batteries are going to be much cheaper and will store a week or more worth of juice to power the home.
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