Apparently a lot of people think that you have to hook your solar system up to your electric box in order to use it. If you're willing to run the proper wires in your house, you can use 12 volts for lighting and other things that you normally use the grid for. You will need batteries for that, but solar isn't cheap to start with. You can also get a power inverter for your 120 volt needs, but not connected to the grid.
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Exactly right.