I'm sure you are aware of this, but just in case, there are good reasons why this hasn't taken place and most of them have to do with battery technology. The b

I'm sure you are aware of this, but just in case, there are good reasons why this hasn't taken place and most of them have to do with battery technology. The basic problem is that the current crop of batteries take too long to charge on residential current and don't hold charge long enough. Their weight is also a big issue.