Takes more than a few panels
It takes more than a few panels to power the average US home - more like 16-24 of the 160W panels, at about $1K ea. That doesn't include the cost of the inverters, cut-off switches, wiring, breakers, etc, or installation. Actually that would be for a modest size home in California, a temperate climate where the average home uses only 500kWh/mo (the national average is double that). This is why the cheapest solar is the solar you avoid having to install because you cut your usage through conservation first.
That's not to say that a small efficient cabin-size home that is well-designed couldn't do with a lot less, so in that scenario a half dozen might be enough, depending on location. Or just start small and add as you go. It's all good, as they say.