But here’s what the installed costs look like for the roughly 3,000 square feet of roofing needed to cover an average size home in the U.S.
Clay Tile: $16,000
Asphalt: $20,000
Slate: $45,000
So how could a $73,500 roof be considered cost-competitive with a $20,000 asphalt roof? To compensate for the proposed added value of the “free” electricity from Tesla’s roof, we added in $2,000 a year, over the lifespan of the roof. That’s a typical electric bill in states where solar is big, like California, Texas, and North Carolina.
Tesla says the life expectancy of its tiles will be 30 years. So that adds $60,000 to the value of the roof. (Our rough estimate assumes our hypothetical Solar Roof homes generate exactly as much electricity as they use.)
One final factor: the Tesla Solar Roof will work like any rooftop solar system, connecting to your home’s electric panel through an inverter. You could stop there, but the system is being packaged alongside Tesla’s forthcoming
Powerwall 2.0, a battery storage device with a built-in inverter and an installed cost of $6,500.
Combining Solar Roof and Powerwall 2.0, Musk promises, will power an entire home with 100 percent renewable energy.