Did you have solar panels installed on your house? If so, ...

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I've been playing with the idea of going solar, but I'm not sure. I heard I would have to replace my roof in order to handle the panels. I also I have a flat roof for my garage, which i get full sun on a majority of the day. I have no trees, so I barely get shade as it is. So I'm just curious if you have solar is it worth it? what did or didn't you like about it? Does it cost a lot to do? Did you have to replace the roof?